Programs & Examples On #Urllib

Python module providing a high-level interface for fetching data across the World Wide Web. Predecessor to urllib2. In Python 3, urllib2 and urllib have been reorganized and merged into urllib.

In Python, how do I use urllib to see if a website is 404 or 200?

You can use urllib2 as well:

import urllib2

req = urllib2.Request('http://www.python.org/fish.html')
try:
    resp = urllib2.urlopen(req)
except urllib2.HTTPError as e:
    if e.code == 404:
        # do something...
    else:
        # ...
except urllib2.URLError as e:
    # Not an HTTP-specific error (e.g. connection refused)
    # ...
else:
    # 200
    body = resp.read()

Note that HTTPError is a subclass of URLError which stores the HTTP status code.

urllib2.HTTPError: HTTP Error 403: Forbidden

import urllib.request

bank_pdf_list = ["https://www.hdfcbank.com/content/bbp/repositories/723fb80a-2dde-42a3-9793-7ae1be57c87f/?path=/Personal/Home/content/rates.pdf",
"https://www.yesbank.in/pdf/forexcardratesenglish_pdf",
"https://www.sbi.co.in/documents/16012/1400784/FOREX_CARD_RATES.pdf"]


def get_pdf(url):
    user_agent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.7) Gecko/2009021910 Firefox/3.0.7'
    
    #url = "https://www.yesbank.in/pdf/forexcardratesenglish_pdf"
    headers={'User-Agent':user_agent,} 
    
    request=urllib.request.Request(url,None,headers) #The assembled request
    response = urllib.request.urlopen(request)
    #print(response.text)
    data = response.read()
#    print(type(data))
    
    name = url.split("www.")[-1].split("//")[-1].split(".")[0]+"_FOREX_CARD_RATES.pdf"
    f = open(name, 'wb')
    f.write(data)
    f.close()
    

for bank_url in bank_pdf_list:
    try: 
        get_pdf(bank_url)
    except:
        pass

Python; urllib error: AttributeError: 'bytes' object has no attribute 'read'

Use json.loads not json.load.

(load loads from a file-like object, loads from a string. So you could just as well omit the .read() call instead.)

What are the differences between the urllib, urllib2, urllib3 and requests module?

A key point that I find missing in the above answers is that urllib returns an object of type <class http.client.HTTPResponse> whereas requests returns <class 'requests.models.Response'>.

Due to this, read() method can be used with urllib but not with requests.

P.S. : requests is already rich with so many methods that it hardly needs one more as read() ;>

How to send POST request?

You can't achieve POST requests using urllib (only for GET), instead try using requests module, e.g.:

Example 1.0:

import requests

base_url="www.server.com"
final_url="/{0}/friendly/{1}/url".format(base_url,any_value_here)

payload = {'number': 2, 'value': 1}
response = requests.post(final_url, data=payload)

print(response.text) #TEXT/HTML
print(response.status_code, response.reason) #HTTP

Example 1.2:

>>> import requests

>>> payload = {'key1': 'value1', 'key2': 'value2'}

>>> r = requests.post("http://httpbin.org/post", data=payload)
>>> print(r.text)
{
  ...
  "form": {
    "key2": "value2",
    "key1": "value1"
  },
  ...
}

Example 1.3:

>>> import json

>>> url = 'https://api.github.com/some/endpoint'
>>> payload = {'some': 'data'}

>>> r = requests.post(url, data=json.dumps(payload))

Python 2.7.10 error "from urllib.request import urlopen" no module named request

Try using urllib2:

https://docs.python.org/2/library/urllib2.html

This line should work to replace urlopen:

from urllib2 import urlopen

Tested in Python 2.7 on Macbook Pro

Try posting a link to the git in question.

Python: Importing urllib.quote

If you need to handle both Python 2.x and 3.x you can catch the exception and load the alternative.

try:
    from urllib import quote  # Python 2.X
except ImportError:
    from urllib.parse import quote  # Python 3+

You could also use the python compatibility wrapper six to handle this.

from six.moves.urllib.parse import quote

How to percent-encode URL parameters in Python?

If you're using django, you can use urlquote:

>>> from django.utils.http import urlquote
>>> urlquote(u"Müller")
u'M%C3%BCller'

Note that changes to Python since this answer was published mean that this is now a legacy wrapper. From the Django 2.1 source code for django.utils.http:

A legacy compatibility wrapper to Python's urllib.parse.quote() function.
(was used for unicode handling on Python 2)

How to urlencode a querystring in Python?

Try requests instead of urllib and you don't need to bother with urlencode!

import requests
requests.get('http://youraddress.com', params=evt.fields)

EDIT:

If you need ordered name-value pairs or multiple values for a name then set params like so:

params=[('name1','value11'), ('name1','value12'), ('name2','value21'), ...]

instead of using a dictionary.

catch specific HTTP error in python

Python 3

from urllib.error import HTTPError

Python 2

from urllib2 import HTTPError

Just catch HTTPError, handle it, and if it's not Error 404, simply use raise to re-raise the exception.

See the Python tutorial.

e.g. complete example for Pyhton 2

import urllib2
from urllib2 import HTTPError
try:
   urllib2.urlopen("some url")
except HTTPError as err:
   if err.code == 404:
       <whatever>
   else:
       raise

'module' has no attribute 'urlencode'

import urllib.parse
urllib.parse.urlencode({'spam': 1, 'eggs': 2, 'bacon': 0})

Downloading a picture via urllib and python

This worked for me using python 3.

It gets a list of URLs from the csv file and starts downloading them into a folder. In case the content or image does not exist it takes that exception and continues making its magic.

import urllib.request
import csv
import os

errorCount=0

file_list = "/Users/$USER/Desktop/YOUR-FILE-TO-DOWNLOAD-IMAGES/image_{0}.jpg"

# CSV file must separate by commas
# urls.csv is set to your current working directory make sure your cd into or add the corresponding path
with open ('urls.csv') as images:
    images = csv.reader(images)
    img_count = 1
    print("Please Wait.. it will take some time")
    for image in images:
        try:
            urllib.request.urlretrieve(image[0],
            file_list.format(img_count))
            img_count += 1
        except IOError:
            errorCount+=1
            # Stop in case you reach 100 errors downloading images
            if errorCount>100:
                break
            else:
                print ("File does not exist")

print ("Done!")

UnicodeEncodeError: 'charmap' codec can't encode characters

set PYTHONIOENCODING=utf-8
set PYTHONLEGACYWINDOWSSTDIO=utf-8

You may or may not need to set that second environment variable PYTHONLEGACYWINDOWSSTDIO.

Alternatively, this can be done in code (although it seems that doing it through env vars is recommended):

sys.stdin.reconfigure(encoding='utf-8')
sys.stdout.reconfigure(encoding='utf-8')

Additionally: Reproducing this error was a bit of a pain, so leaving this here too in case you need to reproduce it on your machine:

set PYTHONIOENCODING=windows-1252
set PYTHONLEGACYWINDOWSSTDIO=windows-1252

AttributeError: 'module' object has no attribute 'urlretrieve'

Suppose you have following lines of code

MyUrl = "www.google.com" #Your url goes here
urllib.urlretrieve(MyUrl)

If you are receiving following error message

AttributeError: module 'urllib' has no attribute 'urlretrieve'

Then you should try following code to fix the issue:

import urllib.request
MyUrl = "www.google.com" #Your url goes here
urllib.request.urlretrieve(MyUrl)

urllib and "SSL: CERTIFICATE_VERIFY_FAILED" Error

My solution for Mac OS X:

1) Upgrade to Python 3.6.5 using the native app Python installer downloaded from the official Python language website https://www.python.org/downloads/

I've found that this installer is taking care of updating the links and symlinks for the new Python a lot better than homebrew.

2) Install a new certificate using "./Install Certificates.command" which is in the refreshed Python 3.6 directory

> cd "/Applications/Python 3.6/"
> sudo "./Install Certificates.command"

python save image from url

A sample code that works for me on Windows:

import requests

with open('pic1.jpg', 'wb') as handle:
        response = requests.get(pic_url, stream=True)

        if not response.ok:
            print response

        for block in response.iter_content(1024):
            if not block:
                break

            handle.write(block)

can we use xpath with BeautifulSoup?

from lxml import etree
from bs4 import BeautifulSoup
soup = BeautifulSoup(open('path of your localfile.html'),'html.parser')
dom = etree.HTML(str(soup))
print dom.xpath('//*[@id="BGINP01_S1"]/section/div/font/text()')

Above used the combination of Soup object with lxml and one can extract the value using xpath

replace special characters in a string python

str.replace is the wrong function for what you want to do (apart from it being used incorrectly). You want to replace any character of a set with a space, not the whole set with a single space (the latter is what replace does). You can use translate like this:

removeSpecialChars = z.translate ({ord(c): " " for c in "!@#$%^&*()[]{};:,./<>?\|`~-=_+"})

This creates a mapping which maps every character in your list of special characters to a space, then calls translate() on the string, replacing every single character in the set of special characters with a space.

AttributeError: 'module' object has no attribute 'urlopen'

One of the possible way to do it:

import urllib
...

try:
    # Python 2
    from urllib2 import urlopen
except ImportError:
    # Python 3
    from urllib.request import urlopen

How do I set headers using python's urllib?

adding HTTP headers using urllib2:

from the docs:

import urllib2
req = urllib2.Request('http://www.example.com/')
req.add_header('Referer', 'http://www.python.org/')
resp = urllib2.urlopen(req)
content = resp.read()

How to download a file over HTTP?

urlretrieve and requests.get are simple, however the reality not. I have fetched data for couple sites, including text and images, the above two probably solve most of the tasks. but for a more universal solution I suggest the use of urlopen. As it is included in Python 3 standard library, your code could run on any machine that run Python 3 without pre-installing site-package

import urllib.request
url_request = urllib.request.Request(url, headers=headers)
url_connect = urllib.request.urlopen(url_request)

#remember to open file in bytes mode
with open(filename, 'wb') as f:
    while True:
        buffer = url_connect.read(buffer_size)
        if not buffer: break

        #an integer value of size of written data
        data_wrote = f.write(buffer)

#you could probably use with-open-as manner
url_connect.close()

This answer provides a solution to HTTP 403 Forbidden when downloading file over http using Python. I have tried only requests and urllib modules, the other module may provide something better, but this is the one I used to solve most of the problems.

I/O error(socket error): [Errno 111] Connection refused

I previously had this problem with my EC2 instance (I was serving couchdb to serve resources -- am considering Amazon's S3 for the future).

One thing to check (assuming Ec2) is that the couchdb port is added to your open ports within your security policy.

I specifically encountered

"[Errno 111] Connection refused"

over EC2 when the instance was stopped and started. The problem seems to be a pidfile race. The solution for me was killing couchdb (entirely and properly) via:

pkill -f couchdb

and then restarting with:

/etc/init.d/couchdb restart

Python: URLError: <urlopen error [Errno 10060]

This is because of the proxy settings. I also had the same problem, under which I could not use any of the modules which were fetching data from the internet. There are simple steps to follow:
1. open the control panel
2. open internet options
3. under connection tab open LAN settings
4. go to advance settings and unmark everything, delete every proxy in there. Or u can just unmark the checkbox in proxy server this will also do the same
5. save all the settings by clicking ok.
you are done. try to run the programme again, it must work it worked for me at least

SSL: CERTIFICATE_VERIFY_FAILED with Python3

In my case, I used the ssl module to "workaround" the certification like so:

import ssl

ssl._create_default_https_context = ssl._create_unverified_context

Then to read your link content, you can use:

urllib.request.urlopen(urllink)

Making a POST call instead of GET using urllib2

This may have been answered before: Python URLLib / URLLib2 POST.

Your server is likely performing a 302 redirect from http://myserver/post_service to http://myserver/post_service/. When the 302 redirect is performed, the request changes from POST to GET (see Issue 1401). Try changing url to http://myserver/post_service/.

Python: Get HTTP headers from urllib2.urlopen call?

Use the response.info() method to get the headers.

From the urllib2 docs:

urllib2.urlopen(url[, data][, timeout])

...

This function returns a file-like object with two additional methods:

  • geturl() — return the URL of the resource retrieved, commonly used to determine if a redirect was followed
  • info() — return the meta-information of the page, such as headers, in the form of an httplib.HTTPMessage instance (see Quick Reference to HTTP Headers)

So, for your example, try stepping through the result of response.info().headers for what you're looking for.

Note the major caveat to using httplib.HTTPMessage is documented in python issue 4773.

installing urllib in Python3.6

The corrected code is

import urllib.request
fhand = urllib.request.urlopen('http://data.pr4e.org/romeo.txt')
counts = dict()
for line in fhand: 
    words = line.decode().split() 
for word in words: 
    counts[word] = counts.get(word, 0) + 1 
print(counts) 

running the code above produces

{'Who': 1, 'is': 1, 'already': 1, 'sick': 1, 'and': 1, 'pale': 1, 'with': 1, 'grief': 1}

Handling urllib2's timeout? - Python

In Python 2.7.3:

import urllib2
import socket

class MyException(Exception):
    pass

try:
    urllib2.urlopen("http://example.com", timeout = 1)
except urllib2.URLError as e:
    print type(e)    #not catch
except socket.timeout as e:
    print type(e)    #catched
    raise MyException("There was an error: %r" % e)

no module named urllib.parse (How should I install it?)

python3 supports urllib.parse and python2 supports urlparse

If you want both compatible then the following code can help.

import sys

if ((3, 0) <= sys.version_info <= (3, 9)):
    from urllib.parse import urlparse
elif ((2, 0) <= sys.version_info <= (2, 9)):
    from urlparse import urlparse

Update: Change if condition to support higher versions if (3, 0) <= sys.version_info:.

Python URLLib / URLLib2 POST

u = urllib2.urlopen('http://myserver/inout-tracker', data)
h.request('POST', '/inout-tracker/index.php', data, headers)

Using the path /inout-tracker without a trailing / doesn't fetch index.php. Instead the server will issue a 302 redirect to the version with the trailing /.

Doing a 302 will typically cause clients to convert a POST to a GET request.

multiple conditions for filter in spark data frames

This question has been answered but for future reference, I would like to mention that, in the context of this question, the where and filter methods in Dataset/Dataframe supports two syntaxes: The SQL string parameters:

df2 = df1.filter(("Status = 2 or Status = 3"))

and Col based parameters (mentioned by @David ):

df2 = df1.filter($"Status" === 2 || $"Status" === 3)

It seems the OP'd combined these two syntaxes. Personally, I prefer the first syntax because it's cleaner and more generic.

Creating watermark using html and css

you may use opacity:0.5;//what ever you wish between 0 and 1 for this.

working Fiddle

FirstOrDefault: Default value other than null

Actually, I use two approaches to avoid NullReferenceException when I'm working with collections:

public class Foo
{
    public string Bar{get; set;}
}
void Main()
{
    var list = new List<Foo>();
    //before C# 6.0
    string barCSharp5 = list.DefaultIfEmpty(new Foo()).FirstOrDefault().Bar;
    //C# 6.0 or later
    var barCSharp6 = list.FirstOrDefault()?.Bar;
}

For C# 6.0 or later:

Use ?. or ?[ to test if is null before perform a member access Null-conditional Operators documentation

Example: var barCSharp6 = list.FirstOrDefault()?.Bar;

C# older version:

Use DefaultIfEmpty() to retrieve a default value if the sequence is empty.MSDN Documentation

Example: string barCSharp5 = list.DefaultIfEmpty(new Foo()).FirstOrDefault().Bar;

Why doesn't Java allow overriding of static methods?

Here is a simple explanation. A static method is associated with a class while an instance method is associated with a particular object. Overrides allow calling the different implementation of the overridden methods associated with the particular object. So it is counter-intuitive to override static method which is not even associated with objects but the class itself in the first place. So static methods cannot be overridden based on what object is calling it, it will always be associated with the class where it was created.

How to set the min and max height or width of a Frame?

A workaround - at least for the minimum size: You can use grid to manage the frames contained in root and make them follow the grid size by setting sticky='nsew'. Then you can use root.grid_rowconfigure and root.grid_columnconfigure to set values for minsize like so:

from tkinter import Frame, Tk

class MyApp():
    def __init__(self):
        self.root = Tk()

        self.my_frame_red = Frame(self.root, bg='red')
        self.my_frame_red.grid(row=0, column=0, sticky='nsew')

        self.my_frame_blue = Frame(self.root, bg='blue')
        self.my_frame_blue.grid(row=0, column=1, sticky='nsew')

        self.root.grid_rowconfigure(0, minsize=200, weight=1)
        self.root.grid_columnconfigure(0, minsize=200, weight=1)
        self.root.grid_columnconfigure(1, weight=1)

        self.root.mainloop()

if __name__ == '__main__':
    app = MyApp()

But as Brian wrote (in 2010 :D) you can still resize the window to be smaller than the frame if you don't limit its minsize.

Use nginx to serve static files from subdirectories of a given directory

It should work, however http://nginx.org/en/docs/http/ngx_http_core_module.html#alias says:

When location matches the last part of the directive’s value: it is better to use the root directive instead:

which would yield:

server {
  listen        8080;
  server_name   www.mysite.com mysite.com;
  error_log     /home/www-data/logs/nginx_www.error.log;
  error_page    404    /404.html;

  location /public/doc/ {
    autoindex on;
    root  /home/www-data/mysite;
  } 

  location = /404.html {
    root /home/www-data/mysite/static/html;
  }       
}

How to repeat last command in python interpreter shell?

I use the following to enable history on python shell.

This is my .pythonstartup file . PYTHONSTARTUP environment variable is set to this file path.

# python startup file 
import readline 
import rlcompleter 
import atexit 
import os 
# tab completion 
readline.parse_and_bind('tab: complete') 
# history file 
histfile = os.path.join(os.environ['HOME'], '.pythonhistory') 
try: 
    readline.read_history_file(histfile) 
except IOError: 
    pass 
atexit.register(readline.write_history_file, histfile) 
del os, histfile, readline, rlcompleter

You will need to have the modules readline, rlcompleter to enable this.

Check out the info on this at : http://docs.python.org/using/cmdline.html#envvar-PYTHONSTARTUP.

Modules required:

  1. http://docs.python.org/library/readline.html
  2. http://docs.python.org/library/rlcompleter.html

How to install JRE 1.7 on Mac OS X and use it with Eclipse?

The download from java.com which installs in /Library/Internet Plug-Ins is only the JRE, for development you probably want to download the JDK from http://www.oracle.com/technetwork/java/javase/downloads/index.html and install that instead. This will install the JDK at /Library/Java/JavaVirtualMachines/jdk1.7.0_<something>.jdk/Contents/Home which you can then add to Eclipse via Preferences -> Java -> Installed JREs.

How to set a hidden value in Razor

How about like this

public static MvcHtmlString HiddenFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, object value, object htmlAttributes)
    {
        return HiddenFor(htmlHelper, expression, value, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
    }

    public static MvcHtmlString HiddenFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, object value, IDictionary<string, object> htmlAttributes)
    {
        return htmlHelper.Hidden(ExpressionHelper.GetExpressionText(expression), value, htmlAttributes);
    }

Use it like this

 @Html.HiddenFor(customerId => reviewModel.CustomerId, Site.LoggedInCustomerId, null)

How to store and retrieve a dictionary with redis

Try rejson-py which is relatively new since 2017. Look at this introduction.

from rejson import Client, Path

rj = Client(host='localhost', port=6379)

# Set the key `obj` to some object
obj = {
    'answer': 42,
    'arr': [None, True, 3.14],
    'truth': {
        'coord': 'out there'
    }
}
rj.jsonset('obj', Path.rootPath(), obj)

# Get something
print 'Is there anybody... {}?'.format(
    rj.jsonget('obj', Path('.truth.coord'))
)

# Delete something (or perhaps nothing), append something and pop it
rj.jsondel('obj', Path('.arr[0]'))
rj.jsonarrappend('obj', Path('.arr'), 'something')
print '{} popped!'.format(rj.jsonarrpop('obj', Path('.arr')))

# Update something else
rj.jsonset('obj', Path('.answer'), 2.17)

ORA-00942: table or view does not exist (works when a separate sql, but does not work inside a oracle function)

There are a couple of things you could look at. Based on your question, it looks like the function owner is different from the table owner.

1) Grants via a role : In order to create stored procedures and functions on another user's objects, you need direct access to the objects (instead of access through a role).

2)

By default, stored procedures and SQL methods execute with the privileges of their owner, not their current user.

If you created a table in Schema A and the function in Schema B, you should take a look at Oracle's Invoker/Definer Rights concepts to understand what might be causing the issue.

http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14261/subprograms.htm#LNPLS00809

numpy get index where value is true

A simple and clean way: use np.argwhere to group the indices by element, rather than dimension as in np.nonzero(a) (i.e., np.argwhere returns a row for each non-zero element).

>>> a = np.arange(10)
>>> a
array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
>>> np.argwhere(a>4)
array([[5],
       [6],
       [7],
       [8],
       [9]])

np.argwhere(a) is the same as np.transpose(np.nonzero(a)).

Note: You cannot use a(np.argwhere(a>4)) to get the corresponding values in a. The recommended way is to use a[(a>4).astype(bool)] or a[(a>4) != 0] rather than a[np.nonzero(a>4)] as they handle 0-d arrays correctly. See the documentation for more details. As can be seen in the following example, a[(a>4).astype(bool)] and a[(a>4) != 0] can be simplified to a[a>4].

Another example:

>>> a = np.array([5,-15,-8,-5,10])
>>> a
array([  5, -15,  -8,  -5,  10])
>>> a > 4
array([ True, False, False, False,  True])
>>> a[a > 4]
array([ 5, 10])
>>> a = np.add.outer(a,a)
>>> a
array([[ 10, -10,  -3,   0,  15],
       [-10, -30, -23, -20,  -5],
       [ -3, -23, -16, -13,   2],
       [  0, -20, -13, -10,   5],
       [ 15,  -5,   2,   5,  20]])
>>> a = np.argwhere(a>4)
>>> a
array([[0, 0],
       [0, 4],
       [3, 4],
       [4, 0],
       [4, 3],
       [4, 4]])
>>> [print(i,j) for i,j in a]
0 0
0 4
3 4
4 0
4 3
4 4

For loop in Oracle SQL

You are pretty confused my friend. There are no LOOPS in SQL, only in PL/SQL. Here's a few examples based on existing Oracle table - copy/paste to see results:

-- Numeric FOR loop --
set serveroutput on -->> do not use in TOAD --
DECLARE
  k NUMBER:= 0;
BEGIN
  FOR i IN 1..10 LOOP
    k:= k+1;
    dbms_output.put_line(i||' '||k);
 END LOOP;
END;
/

-- Cursor FOR loop --
set serveroutput on
DECLARE
   CURSOR c1 IS SELECT * FROM scott.emp;
   i NUMBER:= 0;
BEGIN
  FOR e_rec IN c1 LOOP
  i:= i+1;
    dbms_output.put_line(i||chr(9)||e_rec.empno||chr(9)||e_rec.ename);
  END LOOP;
END;
/

-- SQL example to generate 10 rows --
SELECT 1 + LEVEL-1 idx
  FROM dual
CONNECT BY LEVEL <= 10
/

Better way to find last used row

This is the best way I've seen to find the last cell.

MsgBox ActiveSheet.UsedRage.SpecialCells(xlCellTypeLastCell).Row

One of the disadvantages to using this is that it's not always accurate. If you use it then delete the last few rows and use it again, it does not always update. Saving your workbook before using this seems to force it to update though.

Using the next bit of code after updating the table (or refreshing the query that feeds the table) forces everything to update before finding the last row. But, it's been reported that it makes excel crash. Either way, calling this before trying to find the last row will ensure the table has finished updating first.

Application.CalculateUntilAsyncQueriesDone

Another way to get the last row for any given column, if you don't mind the overhead.

Function GetLastRow(col, row)
    ' col and row are where we will start.
    ' We will find the last row for the given column.
    Do Until ActiveSheet.Cells(row, col) = ""
        row = row + 1
    Loop
    GetLastRow = row
End Function

Difficulty with ng-model, ng-repeat, and inputs

You get into a difficult situation when it is necessary to understand how scopes, ngRepeat and ngModel with NgModelController work. Also try to use 1.0.3 version. Your example will work a little differently.

You can simply use solution provided by jm-

But if you want to deal with the situation more deeply, you have to understand:

  • how AngularJS works;
  • scopes have a hierarchical structure;
  • ngRepeat creates new scope for every element;
  • ngRepeat build cache of items with additional information (hashKey); on each watch call for every new item (that is not in the cache) ngRepeat constructs new scope, DOM element, etc. More detailed description.
  • from 1.0.3 ngModelController rerenders inputs with actual model values.

How your example "Binding to each element directly" works for AngularJS 1.0.3:

  • you enter letter 'f' into input;
  • ngModelController changes model for item scope (names array is not changed) => name == 'Samf', names == ['Sam', 'Harry', 'Sally'];
  • $digest loop is started;
  • ngRepeat replaces model value from item scope ('Samf') by value from unchanged names array ('Sam');
  • ngModelController rerenders input with actual model value ('Sam').

How your example "Indexing into the array" works:

  • you enter letter 'f' into input;
  • ngModelController changes item in names array => `names == ['Samf', 'Harry', 'Sally'];
  • $digest loop is started;
  • ngRepeat can't find 'Samf' in cache;
  • ngRepeat creates new scope, adds new div element with new input (that is why the input field loses focus - old div with old input is replaced by new div with new input);
  • new values for new DOM elements are rendered.

Also, you can try to use AngularJS Batarang and see how changes $id of the scope of div with input in which you enter.

Find and replace Android studio

If you use refactor->rename for the name of the file, everywhere the file is used in your project the refactor will replace it.

I have already rename variables, xml file, java file, multiple drawable and after the operation I could build directly without error.

Do a back-up of your project and try to see if it work for you.

When does Java's Thread.sleep throw InterruptedException?

A solid and easy way to handle it in single threaded code would be to catch it and retrow it in a RuntimeException, to avoid the need to declare it for every method.

How to run shell script file using nodejs?

Also, you can use shelljs plugin. It's easy and it's cross-platform.

Install command:

npm install [-g] shelljs

What is shellJS

ShellJS is a portable (Windows/Linux/OS X) implementation of Unix shell commands on top of the Node.js API. You can use it to eliminate your shell script's dependency on Unix while still keeping its familiar and powerful commands. You can also install it globally so you can run it from outside Node projects - say goodbye to those gnarly Bash scripts!

An example of how it works:

var shell = require('shelljs');

if (!shell.which('git')) {
  shell.echo('Sorry, this script requires git');
  shell.exit(1);
}

// Copy files to release dir
shell.rm('-rf', 'out/Release');
shell.cp('-R', 'stuff/', 'out/Release');

// Replace macros in each .js file
shell.cd('lib');
shell.ls('*.js').forEach(function (file) {
  shell.sed('-i', 'BUILD_VERSION', 'v0.1.2', file);
  shell.sed('-i', /^.*REMOVE_THIS_LINE.*$/, '', file);
  shell.sed('-i', /.*REPLACE_LINE_WITH_MACRO.*\n/, shell.cat('macro.js'), file);
});
shell.cd('..');

// Run external tool synchronously
if (shell.exec('git commit -am "Auto-commit"').code !== 0) {
  shell.echo('Error: Git commit failed');
  shell.exit(1);
}

Also, you can use from the command line:

$ shx mkdir -p foo
$ shx touch foo/bar.txt
$ shx rm -rf foo

Convert JS date time to MySQL datetime

Solution built on the basis of other answers, while maintaining the timezone and leading zeros:

var d = new Date;

var date = [
    d.getFullYear(),
    ('00' + d.getMonth() + 1).slice(-2),
    ('00' + d.getDate() + 1).slice(-2)
].join('-');

var time = [
    ('00' + d.getHours()).slice(-2),
    ('00' + d.getMinutes()).slice(-2),
    ('00' + d.getSeconds()).slice(-2)
].join(':');

var dateTime = date + ' ' + time;
console.log(dateTime) // 2021-01-41 13:06:01

window.open target _self v window.location.href?

Please use this

window.open("url","_self"); 
  • The first parameter "url" is full path of which page you want to open.
  • The second parameter "_self", It's used for open page in same tab. You want open the page in another tab please use "_blank".

How do I turn a String into a InputStreamReader in java?

Are you trying to get a) Reader functionality out of InputStreamReader, or b) InputStream functionality out of InputStreamReader? You won't get b). InputStreamReader is not an InputStream.

The purpose of InputStreamReader is to take an InputStream - a source of bytes - and decode the bytes to chars in the form of a Reader. You already have your data as chars (your original String). Encoding your String into bytes and decoding the bytes back to chars would be a redundant operation.

If you are trying to get a Reader out of your source, use StringReader.

If you are trying to get an InputStream (which only gives you bytes), use apache commons IOUtils.toInputStream(..) as suggested by other answers here.

Failed to load c++ bson extension

If the bson extension wasn't the reason, I guessed the other reason for "failed to connect" would be the user id's. So I created a new database and added a user for the database, with a password for that user (note: not mongolab account password). I updated those on my code and voila! It worked. Duh right? :D

@Html.DropDownListFor how to set default value

I hope this is helpful to you.

Please try this code,

 @Html.DropDownListFor(model => model.Items, new List<SelectListItem>
   { new SelectListItem{Text="Deactive", Value="False"},
     new SelectListItem{Text="Active", Value="True",  Selected = true},
     })

What is the best way to prevent session hijacking?

// Collect this information on every request
$aip = $_SERVER['REMOTE_ADDR'];
$bip = $_SERVER['HTTP_X_FORWARDED_FOR'];
$agent = $_SERVER['HTTP_USER_AGENT'];
session_start();

// Do this each time the user successfully logs in.
$_SESSION['ident'] = hash("sha256", $aip . $bip . $agent);

// Do this every time the client makes a request to the server, after authenticating
$ident = hash("sha256", $aip . $bip . $agent);
if ($ident != $_SESSION['ident'])
{
    end_session();
    header("Location: login.php");
    // add some fancy pants GET/POST var headers for login.php, that lets you
    // know in the login page to notify the user of why they're being challenged
    // for login again, etc.
}

What this does is capture 'contextual' information about the user's session, pieces of information which should not change during the life of a single session. A user isn't going to be at a computer in the US and in China at the same time, right? So if the IP address changes suddenly within the same session that strongly implies a session hijacking attempt, so you secure the session by ending the session and forcing the user to re-authenticate. This thwarts the hack attempt, the attacker is also forced to login instead of gaining access to the session. Notify the user of the attempt (ajax it up a bit), and vola, Slightly annoyed+informed user and their session/information is protected.

We throw in User Agent and X-FORWARDED-FOR to do our best to capture uniqueness of a session for systems behind proxies/networks. You may be able to use more information then that, feel free to be creative.

It's not 100%, but it's pretty damn effective.

There's more you can do to protect sessions, expire them, when a user leaves a website and comes back force them to login again maybe. You can detect a user leaving and coming back by capturing a blank HTTP_REFERER (domain was typed in the URL bar), or check if the value in the HTTP_REFERER equals your domain or not (the user clicked an external/crafted link to get to your site).

Expire sessions, don't let them remain valid indefinitely.

Don't rely on cookies, they can be stolen, it's one of the vectors of attack for session hijacking.

Array slices in C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace data_seniens
{
    class Program
    {
        static void Main(string[] args)
        {
            //new list
            float [] x=new float[]{11.25f,18.0f,20.0f,10.75f,9.50f, 11.25f, 18.0f, 20.0f, 10.75f, 9.50f };

            //variable
            float eat_sleep_area=x[1]+x[3];
            //print
            foreach (var VARIABLE in x)
            {
                if (VARIABLE < x[7])
                {
                    Console.WriteLine(VARIABLE);
                }
            }



            //keep app run
        Console.ReadLine();
        }
    }
}

Git status ignore line endings / identical files / windows & linux environment / dropbox / mled

I use both windows and linux, but the solution core.autocrlf true didn't help me. I even got nothing changed after git checkout <filename>.

So I use workaround to substitute git status - gitstatus.sh

#!/bin/bash

git status | grep modified | cut -d' ' -f 4 | while read x; do
 x1="$(git show HEAD:$x | md5sum | cut -d' ' -f 1 )"
 x2="$(cat $x | md5sum | cut -d' ' -f 1 )"

 if [ "$x1" != "$x2" ]; then
    echo "$x NOT IDENTICAL"
 fi
done

I just compare md5sum of a file and its brother at repository.

Example output:

$ ./gitstatus.sh
application/script.php NOT IDENTICAL
application/storage/logs/laravel.log NOT IDENTICAL

Java SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'") gives timezone as IST

From ISO 8601 String to Java Date Object

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
sdf.parse("2013-09-29T18:46:19Z"); //prints-> Mon Sep 30 02:46:19 CST 2013

if you don't set TimeZone.getTimeZone("GMT") then it will output Sun Sep 29 18:46:19 CST 2013

From Java Date Object to ISO 8601 String

And to convert Dateobject to ISO 8601 Standard (yyyy-MM-dd'T'HH:mm:ss'Z') use following code

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
sdf.setTimeZone(TimeZone.getTimeZone("GMT"));           
System.out.println(sdf.format(new Date())); //-prints-> 2015-01-22T03:23:26Z

Also note that without ' ' at Z yyyy-MM-dd'T'HH:mm:ssZ prints 2015-01-22T03:41:02+0000

Bootstrap 4: Multilevel Dropdown Inside Navigation

I use the following piece of CSS and JavaScript. It uses an extra class dropdown-submenu. I tested it with Bootstrap 4 beta.

It supports multi level sub menus.

_x000D_
_x000D_
$('.dropdown-menu a.dropdown-toggle').on('click', function(e) {_x000D_
  if (!$(this).next().hasClass('show')) {_x000D_
    $(this).parents('.dropdown-menu').first().find('.show').removeClass('show');_x000D_
  }_x000D_
  var $subMenu = $(this).next('.dropdown-menu');_x000D_
  $subMenu.toggleClass('show');_x000D_
_x000D_
_x000D_
  $(this).parents('li.nav-item.dropdown.show').on('hidden.bs.dropdown', function(e) {_x000D_
    $('.dropdown-submenu .show').removeClass('show');_x000D_
  });_x000D_
_x000D_
_x000D_
  return false;_x000D_
});
_x000D_
.dropdown-submenu {_x000D_
  position: relative;_x000D_
}_x000D_
_x000D_
.dropdown-submenu a::after {_x000D_
  transform: rotate(-90deg);_x000D_
  position: absolute;_x000D_
  right: 6px;_x000D_
  top: .8em;_x000D_
}_x000D_
_x000D_
.dropdown-submenu .dropdown-menu {_x000D_
  top: 0;_x000D_
  left: 100%;_x000D_
  margin-left: .1rem;_x000D_
  margin-right: .1rem;_x000D_
}
_x000D_
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">_x000D_
_x000D_
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous"></script>_x000D_
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script>_x000D_
_x000D_
<nav class="navbar navbar-expand-lg navbar-light bg-light">_x000D_
  <a class="navbar-brand" href="#">Navbar</a>_x000D_
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">_x000D_
    <span class="navbar-toggler-icon"></span>_x000D_
  </button>_x000D_
  <div class="collapse navbar-collapse" id="navbarNavDropdown">_x000D_
    <ul class="navbar-nav">_x000D_
      <li class="nav-item active">_x000D_
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>_x000D_
      </li>_x000D_
      <li class="nav-item dropdown">_x000D_
        <a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">_x000D_
          Dropdown link_x000D_
        </a>_x000D_
        <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">_x000D_
          <li><a class="dropdown-item" href="#">Action</a></li>_x000D_
          <li><a class="dropdown-item" href="#">Another action</a></li>_x000D_
          <li class="dropdown-submenu">_x000D_
            <a class="dropdown-item dropdown-toggle" href="#">Submenu</a>_x000D_
            <ul class="dropdown-menu">_x000D_
              <li><a class="dropdown-item" href="#">Submenu action</a></li>_x000D_
              <li><a class="dropdown-item" href="#">Another submenu action</a></li>_x000D_
_x000D_
_x000D_
              <li class="dropdown-submenu">_x000D_
                <a class="dropdown-item dropdown-toggle" href="#">Subsubmenu</a>_x000D_
                <ul class="dropdown-menu">_x000D_
                  <li><a class="dropdown-item" href="#">Subsubmenu action</a></li>_x000D_
                  <li><a class="dropdown-item" href="#">Another subsubmenu action</a></li>_x000D_
                </ul>_x000D_
              </li>_x000D_
              <li class="dropdown-submenu">_x000D_
                <a class="dropdown-item dropdown-toggle" href="#">Second subsubmenu</a>_x000D_
                <ul class="dropdown-menu">_x000D_
                  <li><a class="dropdown-item" href="#">Subsubmenu action</a></li>_x000D_
                  <li><a class="dropdown-item" href="#">Another subsubmenu action</a></li>_x000D_
                </ul>_x000D_
              </li>_x000D_
_x000D_
_x000D_
_x000D_
            </ul>_x000D_
          </li>_x000D_
        </ul>_x000D_
      </li>_x000D_
    </ul>_x000D_
  </div>_x000D_
</nav>
_x000D_
_x000D_
_x000D_

How to execute an action before close metro app WinJS

If I am not mistaken, it will be onunload event.

"Occurs when the application is about to be unloaded." - MSDN

Best practices for API versioning?

The URL should NOT contain the versions. The version has nothing to do with "idea" of the resource you are requesting. You should try to think of the URL as being a path to the concept you would like - not how you want the item returned. The version dictates the representation of the object, not the concept of the object. As other posters have said, you should be specifying the format (including version) in the request header.

If you look at the full HTTP request for the URLs which have versions, it looks like this:

(BAD WAY TO DO IT):

http://company.com/api/v3.0/customer/123
====>
GET v3.0/customer/123 HTTP/1.1
Accept: application/xml

<====
HTTP/1.1 200 OK
Content-Type: application/xml
<customer version="3.0">
  <name>Neil Armstrong</name>
</customer>

The header contains the line which contains the representation you are asking for ("Accept: application/xml"). That is where the version should go. Everyone seems to gloss over the fact that you may want the same thing in different formats and that the client should be able ask for what it wants. In the above example, the client is asking for ANY XML representation of the resource - not really the true representation of what it wants. The server could, in theory, return something completely unrelated to the request as long as it was XML and it would have to be parsed to realize it is wrong.

A better way is:

(GOOD WAY TO DO IT)

http://company.com/api/customer/123
===>
GET /customer/123 HTTP/1.1
Accept: application/vnd.company.myapp.customer-v3+xml

<===
HTTP/1.1 200 OK
Content-Type: application/vnd.company.myapp-v3+xml
<customer>
  <name>Neil Armstrong</name>
</customer>

Further, lets say the clients think the XML is too verbose and now they want JSON instead. In the other examples you would have to have a new URL for the same customer, so you would end up with:

(BAD)
http://company.com/api/JSONv3.0/customers/123
  or
http://company.com/api/v3.0/customers/123?format="JSON"

(or something similar). When in fact, every HTTP requests contains the format you are looking for:

(GOOD WAY TO DO IT)
===>
GET /customer/123 HTTP/1.1
Accept: application/vnd.company.myapp.customer-v3+json

<===
HTTP/1.1 200 OK
Content-Type: application/vnd.company.myapp-v3+json

{"customer":
  {"name":"Neil Armstrong"}
}

Using this method, you have much more freedom in design and are actually adhering to the original idea of REST. You can change versions without disrupting clients, or incrementally change clients as the APIs are changed. If you choose to stop supporting a representation, you can respond to the requests with HTTP status code or custom codes. The client can also verify the response is in the correct format, and validate the XML.

There are many other advantages and I discuss some of them here on my blog: http://thereisnorightway.blogspot.com/2011/02/versioning-and-types-in-resthttp-api.html

One last example to show how putting the version in the URL is bad. Lets say you want some piece of information inside the object, and you have versioned your various objects (customers are v3.0, orders are v2.0, and shipto object is v4.2). Here is the nasty URL you must supply in the client:

(Another reason why version in the URL sucks)
http://company.com/api/v3.0/customer/123/v2.0/orders/4321/

How to save RecyclerView's scroll position using RecyclerView.State?

I would just like to share the recent predicament I encounter with the RecyclerView. I hope that anyone experiencing the same problem will benefit.

My Project Requirement: So I have a RecyclerView that list some clickable items in my Main Activity (Activity-A). When the Item is clicked a new Activity is shown with the Item Details (Activity-B).

I implemented in the Manifest file the that the Activity-A is the parent of Activity-B, that way, I have a back or home button on the ActionBar of the Activity-B

Problem: Every time I pressed the Back or Home button in the Activity-B ActionBar, the Activity-A goes into the full Activity Life Cycle starting from onCreate()

Even though I implemented an onSaveInstanceState() saving the List of the RecyclerView's Adapter, when Activity-A starts it's lifecycle, the saveInstanceState is always null in the onCreate() method.

Further digging in the internet, I came across the same problem but the person noticed that the Back or Home button below the Anroid device (Default Back/Home button), the Activity-A does not goes into the Activity Life-Cycle.

Solution:

  1. I removed the Tag for Parent Activity in the manifest for Activity-B
  2. I enabled the home or back button on Activity-B

    Under onCreate() method add this line supportActionBar?.setDisplayHomeAsUpEnabled(true)

  3. In the overide fun onOptionsItemSelected() method, I checked for the item.ItemId on which item is clicked based on the id. The Id for the back button is

    android.R.id.home

    Then implement a finish() function call inside the android.R.id.home

    This will end the Activity-B and bring Acitivy-A without going through the entire life-cycle.

For my requirement this is the best solution so far.

     override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_show_project)

    supportActionBar?.title = projectName
    supportActionBar?.setDisplayHomeAsUpEnabled(true)

}


 override fun onOptionsItemSelected(item: MenuItem?): Boolean {

    when(item?.itemId){

        android.R.id.home -> {
            finish()
        }
    }

    return super.onOptionsItemSelected(item)
}

How do I use IValidatableObject?

The problem with the accepted answer is that it now depends on the caller for the object to be properly validated. I would either remove the RangeAttribute and do the range validation inside the Validate method or I would create a custom attribute subclassing RangeAttribute that takes the name of the required property as an argument on the constructor.

For example:

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
class RangeIfTrueAttribute : RangeAttribute
{
    private readonly string _NameOfBoolProp;

    public RangeIfTrueAttribute(string nameOfBoolProp, int min, int max) : base(min, max)
    {
        _NameOfBoolProp = nameOfBoolProp;
    }

    public RangeIfTrueAttribute(string nameOfBoolProp, double min, double max) : base(min, max)
    {
        _NameOfBoolProp = nameOfBoolProp;
    }

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        var property = validationContext.ObjectType.GetProperty(_NameOfBoolProp);
        if (property == null)
            return new ValidationResult($"{_NameOfBoolProp} not found");

        var boolVal = property.GetValue(validationContext.ObjectInstance, null);

        if (boolVal == null || boolVal.GetType() != typeof(bool))
            return new ValidationResult($"{_NameOfBoolProp} not boolean");

        if ((bool)boolVal)
        {
            return base.IsValid(value, validationContext);
        }
        return null;
    }
}

html script src="" triggering redirection with button

I was having this problem but i found out that it was a permissions problem I changed my permissions to 0744 and now it works. I don't know if this was your problem but it worked for me.

Namenode not getting started

I was facing the issue of namenode not starting. I found a solution using following:

  1. first delete all contents from temporary folder: rm -Rf <tmp dir> (my was /usr/local/hadoop/tmp)
  2. format the namenode: bin/hadoop namenode -format
  3. start all processes again:bin/start-all.sh

You may consider rolling back as well using checkpoint (if you had it enabled).

Is it possible to register a http+domain-based URL Scheme for iPhone apps, like YouTube and Maps?

It's quite possible to do this in JavaScript as long as your fallback is another applink. Building on Nathan's suggestion:

<html>
  <head>
    <meta name="viewport" content="width=device-width" />
  </head>
  <body>

    <h2><a id="applink1" href="fb://profile/116201417">open facebook with fallback to appstore</a></h2>
    <h2><a id="applink2" href="unknown://nowhere">open unknown with fallback to appstore</a></h2>
    <p><i>Only works on iPhone!</i></p>    

  <script type="text/javascript">

// To avoid the "protocol not supported" alert, fail must open another app.
var appstorefail = "itms://itunes.apple.com/us/app/facebook/id284882215?mt=8&uo=6";

function applink(fail){
    return function(){
        var clickedAt = +new Date;
        // During tests on 3g/3gs this timeout fires immediately if less than 500ms.
        setTimeout(function(){
            // To avoid failing on return to MobileSafari, ensure freshness!
            if (+new Date - clickedAt < 2000){
                window.location = fail;
            }
        }, 500);    
    };
}

document.getElementById("applink1").onclick = applink(appstorefail);
document.getElementById("applink2").onclick = applink(appstorefail);

</script>
</body>
</html>

Check out a live demo here.

Checking Value of Radio Button Group via JavaScript?

To get the value you would do this:

document.getElementById("genderf").value;

But to check, whether the radio button is checked or selected:

document.getElementById("genderf").checked;

How to test that a registered variable is not empty?

when: myvar | default('', true) | trim != ''

I use | trim != '' to check if a variable has an empty value or not. I also always add the | default(..., true) check to catch when myvar is undefined too.

java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Integer in java 1.6

Use:

((Long) userService.getAttendanceList(currentUser)).intValue();

instead.

The .intValue() method is defined in class Number, which Long extends.

How to insert a new line in strings in Android

I use <br> in a CDATA tag. As an example, my strings.xml file contains an item like this:

<item><![CDATA[<b>My name is John</b><br>Nice to meet you]]></item>

and prints

My name is John
Nice to meet you

Why won't my PHP app send a 404 error?

I came up to this problem.. I think that redirecting to a non existing link on your server might do the trick ! Because the server would return his 404:
header('Redirect abbb.404.nonexist'); < that doesnt exist for sure

python max function using 'key' and lambda expression

max function is used to get the maximum out of an iterable.

The iterators may be lists, tuples, dict objects, etc. Or even custom objects as in the example you provided.

max(iterable[, key=func]) -> value
max(a, b, c, ...[, key=func]) -> value

With a single iterable argument, return its largest item.
With two or more arguments, return the largest argument.

So, the key=func basically allows us to pass an optional argument key to the function on whose basis is the given iterator/arguments are sorted & the maximum is returned.

lambda is a python keyword that acts as a pseudo function. So, when you pass player object to it, it will return player.totalScore. Thus, the iterable passed over to function max will sort according to the key totalScore of the player objects given to it & will return the player who has maximum totalScore.

If no key argument is provided, the maximum is returned according to default Python orderings.

Examples -

max(1, 3, 5, 7)
>>>7
max([1, 3, 5, 7])
>>>7

people = [('Barack', 'Obama'), ('Oprah', 'Winfrey'), ('Mahatma', 'Gandhi')]
max(people, key=lambda x: x[1])
>>>('Oprah', 'Winfrey')

Removing path and extension from filename in PowerShell

you can use basename property

PS II> ls *.ps1 | select basename

How can I print a quotation mark in C?

You have to escape the quotationmark:

printf("\"");

Javascript string/integer comparisons

Checking that strings are integers is separate to comparing if one is greater or lesser than another. You should always compare number with number and string with string as the algorithm for dealing with mixed types not easy to remember.

'00100' < '1' // true

as they are both strings so only the first zero of '00100' is compared to '1' and because it's charCode is lower, it evaluates as lower.

However:

'00100' < 1 // false

as the RHS is a number, the LHS is converted to number before the comparision.

A simple integer check is:

function isInt(n) {
  return /^[+-]?\d+$/.test(n);
}

It doesn't matter if n is a number or integer, it will be converted to a string before the test.

If you really care about performance, then:

var isInt = (function() {
  var re = /^[+-]?\d+$/;

  return function(n) {
    return re.test(n);
  }
}());

Noting that numbers like 1.0 will return false. If you want to count such numbers as integers too, then:

var isInt = (function() {
  var re = /^[+-]?\d+$/;
  var re2 = /\.0+$/;

  return function(n) {
    return re.test((''+ n).replace(re2,''));
  }
}());

Once that test is passed, converting to number for comparison can use a number of methods. I don't like parseInt() because it will truncate floats to make them look like ints, so all the following will be "equal":

parseInt(2.9) == parseInt('002',10) == parseInt('2wewe')

and so on.

Once numbers are tested as integers, you can use the unary + operator to convert them to numbers in the comparision:

if (isInt(a) && isInt(b)) {
  if (+a < +b) {
    // a and b are integers and a is less than b
  }
}

Other methods are:

Number(a); // liked by some because it's clear what is happening
a * 1      // Not really obvious but it works, I don't like it

Android widget: How to change the text of a button

This is very easy

Button btn = (Button) findViewById(R.id.btn);
btn.setText("MyText");

Howto? Parameters and LIKE statement SQL

Your visual basic code would look something like this:

Dim cmd as New SqlCommand("SELECT * FROM compliance_corner WHERE (body LIKE '%' + @query + '%') OR (title LIKE '%' + @query + '%')")

cmd.Parameters.Add("@query", searchString)

Python string prints as [u'String']

Do you really mean u'String'?

In any event, can't you just do str(string) to get a string rather than a unicode-string? (This should be different for Python 3, for which all strings are unicode.)

How to empty/destroy a session in rails?

add this code to your ApplicationController

def reset_session
  @_request.reset_session
end

( Dont know why no one above just mention this code as it fixed my problem ) http://apidock.com/rails/ActionController/RackDelegation/reset_session

How to make the python interpreter correctly handle non-ASCII characters in string operations?

Way too late for an answer, but the original string was in UTF-8 and '\xc2\xa0' is UTF-8 for NO-BREAK SPACE. Simply decode the original string as s.decode('utf-8') (\xa0 displays as a space when decoded incorrectly as Windows-1252 or latin-1:

Example (Python 3)

s = b'6\xc2\xa0918\xc2\xa0417\xc2\xa0712'
print(s.decode('latin-1')) # incorrectly decoded
u = s.decode('utf8') # correctly decoded
print(u)
print(u.replace('\N{NO-BREAK SPACE}','_'))
print(u.replace('\xa0','-')) # \xa0 is Unicode for NO-BREAK SPACE

Output

6 918 417 712
6 918 417 712
6_918_417_712
6-918-417-712

mysql is not recognised as an internal or external command,operable program or batch

In my case, it turned out to be a simple case of spacing.

Turns out, i had a space inserted after the last ; and before ""C:\Program Files\MySQL\MySQL Server 5.7" For this very simple reason, no matter what i did, MySql was still not being recognized.

Once i eliminated the spaces before and after path, it worked perfectly.

In retrospect, seems like a very obvious answer, but nobody's mentioned it anywhere.

Also, i'm new to this whole windows thing, so please excuse me if it sounds very simple.

Import Package Error - Cannot Convert between Unicode and Non Unicode String Data Type

Not sure if this is a best practice with SSIS but sometimes I find their tools are a bit clunky when you want to do this type of activity.

Instead of using their components you can convert the data within your query

Instead of doing

SELECT myField = myNvarchar20Field
FROM myTable

You could do

SELECT myField = CONVERT(VARCHAR(20),myNvarchar20Field)
FROM myTable

how to fix the issue "Command /bin/sh failed with exit code 1" in iphone

I did all above and spent an hour on the issue.

Tried everything above as well as restarted Xcode.

Finally, restarted computer and everything working normally again!

How can I loop over entries in JSON?

Actually, to query the team_name, just add it in brackets to the last line. Apart from that, it seems to work on Python 2.7.3 on command line.

from urllib2 import urlopen
import json

url = 'http://openligadb-json.heroku.com/api/teams_by_league_saison?league_saison=2012&league_shortcut=bl1'
response = urlopen(url)
json_obj = json.load(response)

for i in json_obj['team']:
    print i['team_name']

Adding an external directory to Tomcat classpath

What I suggest you do is add a META-INF directory with a MANIFEST.MF file in .war file.

Please note that according to servlet spec, it must be a .war file and not .war directory for the META-INF/MANIFEST.MF to be read by container.

Edit the MANIFEST.MF Class-Path property to C:\app_config\java_app:

See Using JAR Files: The Basics (Understanding the Manifest)

Enjoy.

AngularJS. How to call controller function from outside of controller component

I've found an example on the internet.

Some guy wrote this code and worked perfectly

HTML

<div ng-cloak ng-app="ManagerApp">
    <div id="MainWrap" class="container" ng-controller="ManagerCtrl">
       <span class="label label-info label-ext">Exposing Controller Function outside the module via onClick function call</span>
       <button onClick='ajaxResultPost("Update:Name:With:JOHN","accept",true);'>click me</button>
       <br/> <span class="label label-warning label-ext" ng-bind="customParams.data"></span>
       <br/> <span class="label label-warning label-ext" ng-bind="customParams.type"></span>
       <br/> <span class="label label-warning label-ext" ng-bind="customParams.res"></span>
       <br/>
       <input type="text" ng-model="sampletext" size="60">
       <br/>
    </div>
</div>

JAVASCRIPT

var angularApp = angular.module('ManagerApp', []);
angularApp.controller('ManagerCtrl', ['$scope', function ($scope) {

$scope.customParams = {};

$scope.updateCustomRequest = function (data, type, res) {
    $scope.customParams.data = data;
    $scope.customParams.type = type;
    $scope.customParams.res = res;
    $scope.sampletext = "input text: " + data;
};



}]);

function ajaxResultPost(data, type, res) {
    var scope = angular.element(document.getElementById("MainWrap")).scope();
    scope.$apply(function () {
    scope.updateCustomRequest(data, type, res);
    });
}

Demo

*I did some modifications, see original: font JSfiddle

Plugin org.apache.maven.plugins:maven-clean-plugin:2.5 or one of its dependencies could not be resolved

In my case my problem was that I was using an older version of NetBeans. The Maven repository removed an http reference, but the embedded Maven in Netbeans had that http reference hard-coded. I was really confused at first because my pom.xml referenced the proper https://repo.maven.apache.org/maven2.

Fixing it was pretty simple. I downloaded the latest zip archive of Maven from the following location and extracted it to my machine: https://maven.apache.org/download.cgi

Within Netbeans at Tools -> Options -> Java -> Maven on the "Execution" section I set "Maven Home" to the newly extracted zip file location.

Now I could build my project....

What is the benefit of zerofill in MySQL?

When you select a column with type ZEROFILL it pads the displayed value of the field with zeros up to the display width specified in the column definition. Values longer than the display width are not truncated. Note that usage of ZEROFILL also implies UNSIGNED.

Using ZEROFILL and a display width has no effect on how the data is stored. It affects only how it is displayed.

Here is some example SQL that demonstrates the use of ZEROFILL:

CREATE TABLE yourtable (x INT(8) ZEROFILL NOT NULL, y INT(8) NOT NULL);
INSERT INTO yourtable (x,y) VALUES
(1, 1),
(12, 12),
(123, 123),
(123456789, 123456789);
SELECT x, y FROM yourtable;

Result:

        x          y
 00000001          1
 00000012         12
 00000123        123
123456789  123456789

Image library for Python 3

Qt works very well with graphics. In my opinion it is more versatile than PIL.

You get all the features you want for graphics manipulation, but there's also vector graphics and even support for real printers. And all of that in one uniform API, QPainter.

To use Qt you need a Python binding for it: PySide or PyQt4.
They both support Python 3.

Here is a simple example that loads a JPG image, draws an antialiased circle of radius 10 at coordinates (20, 20) with the color of the pixel that was at those coordinates and saves the modified image as a PNG file:

from PySide.QtCore import *
from PySide.QtGui import *

app = QCoreApplication([])

img = QImage('input.jpg')

g = QPainter(img)
g.setRenderHint(QPainter.Antialiasing)
g.setBrush(QColor(img.pixel(20, 20)))
g.drawEllipse(QPoint(20, 20), 10, 10)
g.end()

img.save('output.png')

But please note that this solution is quite 'heavyweight', because Qt is a large framework for making GUI applications.

Remove substring from the string

If I'm interpreting right, this question seems to ask for something like a minus (-) operation between strings, i.e. the opposite of the built-in plus (+) operation (concatenation).

Unlike the previous answers, I'm trying to define such an operation that must obey the property:

IF c = a + b THEN c - a = b AND c - b = a

We need only three built-in Ruby methods to achieve this:

'abracadabra'.partition('abra').values_at(0,2).join == 'cadabra'.

I won't explain how it works because it can be easily understood running one method at a time.

Here is a proof of concept code:

# minus_string.rb
class String
  def -(str)
    partition(str).values_at(0,2).join
  end
end

# Add the following code and issue 'ruby minus_string.rb' in the console to test
require 'minitest/autorun'

class MinusString_Test < MiniTest::Test

  A,B,C='abra','cadabra','abracadabra'

  def test_C_eq_A_plus_B
    assert C == A + B
  end

  def test_C_minus_A_eq_B
    assert C - A == B
  end

  def test_C_minus_B_eq_A
    assert C - B == A
  end

end

One last word of advice if you're using a recent Ruby version (>= 2.0): use Refinements instead of monkey-patching String like in the previous example.

It is as easy as:

module MinusString
  refine String do
    def -(str)
      partition(str).values_at(0,2).join
    end
  end
end

and add using MinusString before the blocks where you need it.

C# List of objects, how do I get the sum of a property

Another alternative:

myPlanetsList.Select(i => i.Moons).Sum();

Java: Converting String to and from ByteBuffer and associated problems

Check out the CharsetEncoder and CharsetDecoder API descriptions - You should follow a specific sequence of method calls to avoid this problem. For example, for CharsetEncoder:

  1. Reset the encoder via the reset method, unless it has not been used before;
  2. Invoke the encode method zero or more times, as long as additional input may be available, passing false for the endOfInput argument and filling the input buffer and flushing the output buffer between invocations;
  3. Invoke the encode method one final time, passing true for the endOfInput argument; and then
  4. Invoke the flush method so that the encoder can flush any internal state to the output buffer.

By the way, this is the same approach I am using for NIO although some of my colleagues are converting each char directly to a byte in the knowledge they are only using ASCII, which I can imagine is probably faster.

How To Auto-Format / Indent XML/HTML in Notepad++

It's been the third time that I install Windows and npp and after some time I realize the tidy function no longer work. So I google for a solution, come to this thread, then with the help of few more so threads I finally fix it. I'll put a summary of all my actions once and for all.

  1. Install TextFX plugin: Plugins -> Plugin Manager -> Show Plugin Manager. Select TextFX Characters and install. After a restart of npp, the menu 'TextFX' should be visible. (credits: @remipod).

  2. Install libtidy.dll by pasting the Config folder from an old npp package: Follow instructions in this answer.

  3. After having a Config folder in your latest npp installation destination (typically C:\Program Files (x86)\Notepad++\plugins), npp needs write access to that folder. Right click Config folder -> Properties -> Security tab -> select Users, click Edit -> check Full control to allow read/write access. Note that you need administrator privileges to do that.

  4. Restart npp and verify TextFX -> TextFX HTML Tidy -> Tidy: Reindent XML works.

How to remove all line breaks from a string

If you want to remove all control characters, including CR and LF, you can use this:

myString.replace(/[^\x20-\x7E]/gmi, "")

It will remove all non-printable characters. This are all characters NOT within the ASCII HEX space 0x20-0x7E. Feel free to modify the HEX range as needed.

How to Get XML Node from XDocument

The .Elements operation returns a LIST of XElements - but what you really want is a SINGLE element. Add this:

XElement Contacts = (from xml2 in XMLDoc.Elements("Contacts").Elements("Node")
                    where xml2.Element("ID").Value == variable
                    select xml2).FirstOrDefault();

This way, you tell LINQ to give you the first (or NULL, if none are there) from that LIST of XElements you're selecting.

Marc

Removing object properties with Lodash

You can use _.omit() for emitting the key from a JSON array if you have fewer objects:

_.forEach(data, (d) => {
    _.omit(d, ['keyToEmit1', 'keyToEmit2'])
});

If you have more objects, you can use the reverse of it which is _.pick():

_.forEach(data, (d) => {
    _.pick(d, ['keyToPick1', 'keyToPick2'])
});

Add click event on div tag using javascript

Separate function to make adding event handlers much easier.

function addListener(event, obj, fn) {
    if (obj.addEventListener) {
        obj.addEventListener(event, fn, false);   // modern browsers
    } else {
        obj.attachEvent("on"+event, fn);          // older versions of IE
    }
}

element = document.getElementsByClassName('drill_cursor')[0];

addListener('click', element, function () {
    // Do stuff
});

How to load property file from classpath?

If you use the static method and load the properties file from the classpath folder so you can use the below code :

//load a properties file from class path, inside static method
Properties prop = new Properties();
prop.load(Classname.class.getClassLoader().getResourceAsStream("foo.properties"));

Foreach Control in form, how can I do something to all the TextBoxes in my Form?

foreach (Control X in this.Controls)
{
  if (X is TextBox)
  {
    (X as TextBox).Text = string.Empty;
  }
}

Android Studio - Device is connected but 'offline'

Download and Install your device driver manually through visiting manufacturer website like :Samsung,micromax,intex etc.

Is true == 1 and false == 0 in JavaScript?

Use === to equate the variables instead of ==.

== checks if the value of the variables is similar

=== checks if the value of the variables and the type of the variables are similar

Notice how

if(0===false) {
    document.write("oh!!! that's true");
}?

and

if(0==false) {
    document.write("oh!!! that's true");
}?

give different results

push multiple elements to array

When using most functions of objects with apply or call, the context parameter MUST be the object you are working on.

In this case, you need a.push.apply(a, [1,2]) (or more correctly Array.prototype.push.apply(a, [1,2]))

Fast and Lean PDF Viewer for iPhone / iPad / iOS - tips and hints?

Since iOS 11, you can use the native framework called PDFKit for displaying and manipulating PDFs.

After importing PDFKit, you should initialize a PDFView with a local or a remote URL and display it in your view.

if let url = Bundle.main.url(forResource: "example", withExtension: "pdf") {
    let pdfView = PDFView(frame: view.frame)
    pdfView.document = PDFDocument(url: url)
    view.addSubview(pdfView)
}

Read more about PDFKit in the Apple Developer documentation.

How can I escape a single quote?

use javascript inbuild functions escape and unescape

for example

var escapedData = escape("hel'lo");   
output = "%27hel%27lo%27" which can be used in the attribute.

again to read the value from the attr

var unescapedData = unescape("%27hel%27lo%27")
output = "'hel'lo'"

This will be helpful if you have huge json stringify data to be used in the attribute

Setting Authorization Header of HttpClient

I look for a good way to deal with this issue and I am looking at the same question. Hopefully, this answer will be helping everyone who has the same problem likes me.

using (var client = new HttpClient())
{
    var url = "https://www.theidentityhub.com/{tenant}/api/identity/v1";
    client.DefaultRequestHeaders.Add("Authorization", "Bearer " + accessToken);
    var response = await client.GetStringAsync(url);
    // Parse JSON response.
    ....
}

reference from https://www.theidentityhub.com/hub/Documentation/CallTheIdentityHubApi

How can I update npm on Windows?

This is what worked for me.

  1. Open a local folder other than the one in which nodejs is installed.
  2. Install npm in that folder with command npm install npm
  3. Navigate to the folder containing node js. (C:\Program Files\nodejs\node_modules)
  4. Delete the npm folder and replace it with the npm and bin folders in the local folder.
  5. Run npm -v. Now you would get updated version for npm.

Note: I tried installing npm directly in "C:\Program Files\nodejs\node_modules" but it created errors.

Error - Android resource linking failed (AAPT2 27.0.3 Daemon #0)

feel so stupid - (for whatever reason) i had one empty xml in drawable folder. and AS produced dozens of unrelated errors ><

so, my general advice would be the same - check briefly every resource file.

Simpler way to check if variable is not equal to multiple string values?

An alternative that might make sense especially if this test is being made multiple times and you are running PHP 7+ and have installed the Set class is:

use Ds\Set;

$strings = new Set(['uk', 'in']);    
if (!$strings->contains($some_variable)) {

Or on any version of PHP you can use an associative array to simulate a set:

$strings = ['uk' => 1, 'in' => 1];
if (!isset($strings[$some_variable])) {

There is additional overhead in creating the set but each test then becomes an O(1) operation. Of course the savings becomes greater the longer the list of strings being compared is.

Java 32-bit vs 64-bit compatibility

All byte code is 8-bit based. (That's why its called BYTE code) All the instructions are a multiple of 8-bits in size. We develop on 32-bit machines and run our servers with 64-bit JVM.

Could you give some detail of the problem you are facing? Then we might have a chance of helping you. Otherwise we would just be guessing what the problem is you are having.

Appending items to a list of lists in python

import csv
cols = [' V1', ' I1'] # define your columns here, check the spaces!
data = [[] for col in cols] # this creates a list of **different** lists, not a list of pointers to the same list like you did in [[]]*len(positions) 
with open('data.csv', 'r') as f:
    for rec in csv.DictReader(f):
        for l, col in zip(data, cols):
            l.append(float(rec[col]))
print data

# [[3.0, 3.0], [0.01, 0.01]]

Maven- No plugin found for prefix 'spring-boot' in the current project and in the plugin groups

If you are using Spring Boot for application, forgetting to add

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.2.7.RELEASE</version>
 </parent>

can cause this issue, as well as missing these lines

<repositories>
    <repository>
        <id>spring-releases</id>
        <url>https://repo.spring.io/libs-release</url>
    </repository>
</repositories>
<pluginRepositories>
    <pluginRepository>
        <id>spring-releases</id>
        <url>https://repo.spring.io/libs-release</url>
    </pluginRepository>
</pluginRepositories>

CodeIgniter removing index.php from url

you can go to application\config\config.php file and remove index.php


 $config['index_page'] = 'index.php';   // delete index.php

Change to


 $config['index_page'] = '';

how to merge 200 csv files in Python

An easy-to-use function:

def csv_merge(destination_path, *source_paths):
'''
Merges all csv files on source_paths to destination_path.
:param destination_path: Path of a single csv file, doesn't need to exist
:param source_paths: Paths of csv files to be merged into, needs to exist
:return: None
'''
with open(destination_path,"a") as dest_file:
    with open(source_paths[0]) as src_file:
        for src_line in src_file.read():
            dest_file.write(src_line)
    source_paths.pop(0)
    for i in range(len(source_paths)):
        with open(source_paths[i]) as src_file:
            src_file.next()
            for src_line in src_file:
                 dest_file.write(src_line)

make iframe height dynamic based on content inside- JQUERY/Javascript

jQuery('.home_vidio_img1 img').click(function(){
    video = '<iframe src="'+ jQuery(this).attr('data-video') +'"></iframe>';
    jQuery(this).replaceWith(video);
});

jQuery('.home_vidio_img2 img').click(function(){
    video = <iframe src="'+ jQuery(this).attr('data-video') +'"></iframe>;
    jQuery('.home_vidio_img1 img').replaceWith(video);
    jQuery('.home_vidio_img1 iframe').replaceWith(video);
});

jQuery('.home_vidio_img3 img').click(function(){
    video = '<iframe src="'+ jQuery(this).attr('data-video') +'"></iframe>';
    jQuery('.home_vidio_img1 img').replaceWith(video);
    jQuery('.home_vidio_img1 iframe').replaceWith(video);
});

jQuery('.home_vidio_img4 img').click(function(){
    video = '<iframe src="'+ jQuery(this).attr('data-video') +'"></iframe>';
    jQuery('.home_vidio_img1 img').replaceWith(video);
    jQuery('.home_vidio_img1 iframe').replaceWith(video);
});

How to display scroll bar onto a html table

Something like this?

http://jsfiddle.net/TweNm/

The idea is to wrap the <table> in a non-statically positioned <div> which has an overflow:auto CSS property. Then position the elements in the <thead> absolutely.

_x000D_
_x000D_
#table-wrapper {_x000D_
  position:relative;_x000D_
}_x000D_
#table-scroll {_x000D_
  height:150px;_x000D_
  overflow:auto;  _x000D_
  margin-top:20px;_x000D_
}_x000D_
#table-wrapper table {_x000D_
  width:100%;_x000D_
_x000D_
}_x000D_
#table-wrapper table * {_x000D_
  background:yellow;_x000D_
  color:black;_x000D_
}_x000D_
#table-wrapper table thead th .text {_x000D_
  position:absolute;   _x000D_
  top:-20px;_x000D_
  z-index:2;_x000D_
  height:20px;_x000D_
  width:35%;_x000D_
  border:1px solid red;_x000D_
}
_x000D_
<div id="table-wrapper">_x000D_
  <div id="table-scroll">_x000D_
    <table>_x000D_
        <thead>_x000D_
            <tr>_x000D_
                <th><span class="text">A</span></th>_x000D_
                <th><span class="text">B</span></th>_x000D_
                <th><span class="text">C</span></th>_x000D_
            </tr>_x000D_
        </thead>_x000D_
        <tbody>_x000D_
          <tr> <td>1, 0</td> <td>2, 0</td> <td>3, 0</td> </tr>_x000D_
          <tr> <td>1, 1</td> <td>2, 1</td> <td>3, 1</td> </tr>_x000D_
          <tr> <td>1, 2</td> <td>2, 2</td> <td>3, 2</td> </tr>_x000D_
          <tr> <td>1, 3</td> <td>2, 3</td> <td>3, 3</td> </tr>_x000D_
          <tr> <td>1, 4</td> <td>2, 4</td> <td>3, 4</td> </tr>_x000D_
          <tr> <td>1, 5</td> <td>2, 5</td> <td>3, 5</td> </tr>_x000D_
          <tr> <td>1, 6</td> <td>2, 6</td> <td>3, 6</td> </tr>_x000D_
          <tr> <td>1, 7</td> <td>2, 7</td> <td>3, 7</td> </tr>_x000D_
          <tr> <td>1, 8</td> <td>2, 8</td> <td>3, 8</td> </tr>_x000D_
          <tr> <td>1, 9</td> <td>2, 9</td> <td>3, 9</td> </tr>_x000D_
          <tr> <td>1, 10</td> <td>2, 10</td> <td>3, 10</td> </tr>_x000D_
          <!-- etc... -->_x000D_
          <tr> <td>1, 99</td> <td>2, 99</td> <td>3, 99</td> </tr>_x000D_
        </tbody>_x000D_
    </table>_x000D_
  </div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

SQL LIKE condition to check for integer?

PostgreSQL supports regular expressions matching.

So, your example would look like

SELECT * FROM books WHERE title ~ '^\d+ ?' 

This will match a title starting with one or more digits and an optional space

How to download source in ZIP format from GitHub?

As of June 2016, the Download ZIP button is still under the <> Code tab, however it is now inside a button with two options clone or download:

Symfony image example

Cannot find or open the PDB file in Visual Studio C++ 2010

This can also happen if you don't have Modify permissions on the symbol cache directory configured in Tools, Options, Debugging, Symbols.

AngularJS: factory $http.get JSON file

I wanted to note that the fourth part of Accepted Answer is wrong .

theApp.factory('mainInfo', function($http) { 

var obj = {content:null};

$http.get('content.json').success(function(data) {
    // you can do some processing here
    obj.content = data;
});    

return obj;    
});

The above code as @Karl Zilles wrote will fail because obj will always be returned before it receives data (thus the value will always be null) and this is because we are making an Asynchronous call.

The details of similar questions are discussed in this post


In Angular, use $promise to deal with the fetched data when you want to make an asynchronous call.

The simplest version is

theApp.factory('mainInfo', function($http) { 
    return {
        get:  function(){
            $http.get('content.json'); // this will return a promise to controller
        }
});


// and in controller

mainInfo.get().then(function(response) { 
    $scope.foo = response.data.contentItem;
});

The reason I don't use success and error is I just found out from the doc, these two methods are deprecated.

The $http legacy promise methods success and error have been deprecated. Use the standard then method instead.

Create a branch in Git from another branch

To create a branch from another branch in your local directory you can use following command.

git checkout -b <sub-branch> branch

For Example:

  • name of the new branch to be created 'XYZ'
  • name of the branch ABC under which XYZ has to be created
git checkout -b XYZ ABC

How do I turn off Unicode in a VC++ project?

None of the above solutions worked for me. But

#include <Windows.h>

worked fine.

Adding Access-Control-Allow-Origin header response in Laravel 5.3 Passport

Create A Cors.php File in App/Http/Middleware and paste this in it. ☑

<?php

namespace App\Http\Middleware;

use Closure;


class Cors {    public function handle($request, Closure $next)
    {
        header("Access-Control-Allow-Origin: *");
        //ALLOW OPTIONS METHOD
        $headers = [
            'Access-Control-Allow-Methods' => 'POST,GET,OPTIONS,PUT,DELETE',
            'Access-Control-Allow-Headers' => 'Content-Type, X-Auth-Token, Origin, Authorization',
        ];
        if ($request->getMethod() == "OPTIONS"){
            //The client-side application can set only headers allowed in Access-Control-Allow-Headers
            return response()->json('OK',200,$headers);
        }
        $response = $next($request);
        foreach ($headers as $key => $value) {
            $response->header($key, $value);
        }
        return $response;

    } }

And Add This Line In Your Kernel.php after the "Trust Proxies::Class" Line.

\App\Http\Middleware\Cors::class,

Thats It You have Allowed All Cors Header. ☑

c# Image resizing to different size while preserving aspect ratio

public static void resizeImage_n_save(Stream sourcePath, string targetPath, int requiredSize)
    {
        using (var image = System.Drawing.Image.FromStream(sourcePath))
        {
            double ratio = 0;

            var newWidth = 0;
            var newHeight = 0;
            double w = Convert.ToInt32(image.Width);
            double h = Convert.ToInt32(image.Height);
            if (w > h)
            {
                ratio = h / w * 100;
                newWidth = requiredSize;
                newHeight = Convert.ToInt32(requiredSize * ratio / 100);
            }
            else
            {
                ratio = w / h * 100;
                newHeight = requiredSize;
                newWidth = Convert.ToInt32(requiredSize * ratio / 100);
            }

            //   var newWidth = (int)(image.Width * scaleFactor);
            // var newHeight = (int)(image.Height * scaleFactor);
            var thumbnailImg = new Bitmap(newWidth, newHeight);
            var thumbGraph = Graphics.FromImage(thumbnailImg);
            thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
            thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
            thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
            var imageRectangle = new Rectangle(0, 0, newWidth, newHeight);

            thumbGraph.DrawImage(image, imageRectangle);
            thumbnailImg.Save(targetPath, image.RawFormat);

            //var img = FixedSize(image, requiredSize, requiredSize);
            //img.Save(targetPath, image.RawFormat);

        }
    }

What is the Git equivalent for revision number?

Along with the SHA-1 id of the commit, date and time of the server time would have helped?

Something like this:

commit happened at 11:30:25 on 19 aug 2013 would show as 6886bbb7be18e63fc4be68ba41917b48f02e09d7_19aug2013_113025

How to push changes to github after jenkins build completes?

I followed the below Steps. It worked for me.

In Jenkins execute shell under Build, creating a file and trying to push that file from Jenkins workspace to GitHub.

enter image description here

Download Git Publisher Plugin and Configure as shown below snapshot.

enter image description here

Click on Save and Build. Now you can check your git repository whether the file was pushed successfully or not.

What is the main difference between PATCH and PUT request?

Here are the difference between POST, PUT and PATCH methods of a HTTP protocol.

POST

A HTTP.POST method always creates a new resource on the server. Its a non-idempotent request i.e. if user hits same requests 2 times it would create another new resource if there is no constraint.

http post method is like a INSERT query in SQL which always creates a new record in database.

Example: Use POST method to save new user, order etc where backend server decides the resource id for new resource.

PUT

In HTTP.PUT method the resource is first identified from the URL and if it exists then it is updated otherwise a new resource is created. When the target resource exists it overwrites that resource with a complete new body. That is HTTP.PUT method is used to CREATE or UPDATE a resource.

http put method is like a MERGE query in SQL which inserts or updates a record depending upon whether the given record exists.

PUT request is idempotent i.e. hitting the same requests twice would update the existing recording (No new record created). In PUT method the resource id is decided by the client and provided in the request url.

Example: Use PUT method to update existing user or order.

PATCH

A HTTP.PATCH method is used for partial modifications to a resource i.e. delta updates.

http patch method is like a UPDATE query in SQL which sets or updates selected columns only and not the whole row.

Example: You could use PATCH method to update order status.

PATCH /api/users/40450236/order/10234557

Request Body: {status: 'Delivered'}

Read a text file using Node.js?

You can use readstream and pipe to read the file line by line without read all the file into memory one time.

var fs = require('fs'),
    es = require('event-stream'),
    os = require('os');

var s = fs.createReadStream(path)
    .pipe(es.split())
    .pipe(es.mapSync(function(line) {
        //pause the readstream
        s.pause();
        console.log("line:", line);
        s.resume();
    })
    .on('error', function(err) {
        console.log('Error:', err);
    })
    .on('end', function() {
        console.log('Finish reading.');
    })
);

How do I use Access-Control-Allow-Origin? Does it just go in between the html head tags?

That is an HTTP header. You would configure your webserver or webapp to send this header ideally. Perhaps in htaccess or PHP.

Alternatively you might be able to use

<head>...<meta http-equiv="Access-Control-Allow-Origin" content="*">...</head>

I do not know if that would work. Not all HTTP headers can be configured directly in the HTML.

This works as an alternative to many HTTP headers, but see @EricLaw's comment below. This particular header is different.

Caveat

This answer is strictly about how to set headers. I do not know anything about allowing cross domain requests.

About HTTP Headers

Every request and response has headers. The browser sends this to the webserver

GET /index.htm HTTP/1.1

Then the headers

Host: www.example.com
User-Agent: (Browser/OS name and version information)
.. Additional headers indicating supported compression types and content types and other info

Then the server sends a response

Content-type: text/html
Content-length: (number of bytes in file (optional))
Date: (server clock)
Server: (Webserver name and version information)

Additional headers can be configured for example Cache-Control, it all depends on your language (PHP, CGI, Java, htaccess) and webserver (Apache, etc).

$_POST not working. "Notice: Undefined index: username..."

undefined index means that somewhere in the $_POST array, there isn't an index (key) for the key username.

You should be setting your posted values into variables for a more clean solution, and it's a good habit to get into.

If I was having a similar error, I'd do something like this:

$username = $_POST['username']; // you should really do some more logic to see if it's set first
echo $username;

If username didn't turn up, that'd mean I was screwing up somewhere. You can also,

var_dump($_POST);

To see what you're posting. var_dump is really useful as far as debugging. Check it out: var_dump

SQL Server FOR EACH Loop

This kind of depends on what you want to do with the results. If you're just after the numbers, a set-based option would be a numbers table - which comes in handy for all sorts of things.

For MSSQL 2005+, you can use a recursive CTE to generate a numbers table inline:

;WITH Numbers (N) AS (
    SELECT 1 UNION ALL
    SELECT 1 + N FROM Numbers WHERE N < 500 
)
SELECT N FROM Numbers
OPTION (MAXRECURSION 500)

build maven project with propriatery libraries included

Why not run something like Nexus, your own maven repo that you can upload 3rd party proprietary jar files, and also proxy other public repositories, to save on bandwith?

This also has some good reasons to run your own maven repository manager.

How to save a figure in MATLAB from the command line?

I don't think you can save it without it appearing, but just for saving in multiple formats use the print command. See the answer posted here: Save an imagesc output in Matlab

How to handle an IF STATEMENT in a Mustache template?

Mustache templates are, by design, very simple; the homepage even says:

Logic-less templates.

So the general approach is to do your logic in JavaScript and set a bunch of flags:

if(notified_type == "Friendship")
    data.type_friendship = true;
else if(notified_type == "Other" && action == "invite")
    data.type_other_invite = true;
//...

and then in your template:

{{#type_friendship}}
    friendship...
{{/type_friendship}}
{{#type_other_invite}}
    invite...
{{/type_other_invite}}

If you want some more advanced functionality but want to maintain most of Mustache's simplicity, you could look at Handlebars:

Handlebars provides the power necessary to let you build semantic templates effectively with no frustration.

Mustache templates are compatible with Handlebars, so you can take a Mustache template, import it into Handlebars, and start taking advantage of the extra Handlebars features.

Why can't I make a vector of references?

It's a flaw in the C++ language. You can't take the address of a reference, since attempting to do so would result in the address of the object being referred to, and thus you can never get a pointer to a reference. std::vector works with pointers to its elements, so the values being stored need to be able to be pointed to. You'll have to use pointers instead.

Subtracting 2 lists in Python

Here's an alternative to list comprehensions. Map iterates through the list(s) (the latter arguments), doing so simulataneously, and passes their elements as arguments to the function (the first arg). It returns the resulting list.

import operator
map(operator.sub, a, b)

This code because has less syntax (which is more aesthetic for me), and apparently it's 40% faster for lists of length 5 (see bobince's comment). Still, either solution will work.

How to check java bit version on Linux?

Go to this JVM online test and run it.

Then check the architecture displayed: x86_64 means you have the 64bit version installed, otherwise it's 32bit.

Keras model.summary() result - Understanding the # of Parameters

Number of parameters is the amount of numbers that can be changed in the model. Mathematically this means number of dimensions of your optimization problem. For you as a programmer, each of this parameters is a floating point number, which typically takes 4 bytes of memory, allowing you to predict the size of this model once saved.

This formula for this number is different for each neural network layer type, but for Dense layer it is simple: each neuron has one bias parameter and one weight per input: N = n_neurons * ( n_inputs + 1).

Why is git push gerrit HEAD:refs/for/master used instead of git push origin master

The documentation for Gerrit, in particular the "Push changes" section, explains that you push to the "magical refs/for/'branch' ref using any Git client tool".

The following image is taken from the Intro to Gerrit. When you push to Gerrit, you do git push gerrit HEAD:refs/for/<BRANCH>. This pushes your changes to the staging area (in the diagram, "Pending Changes"). Gerrit doesn't actually have a branch called <BRANCH>; it lies to the git client.

Internally, Gerrit has its own implementation for the Git and SSH stacks. This allows it to provide the "magical" refs/for/<BRANCH> refs.

When a push request is received to create a ref in one of these namespaces Gerrit performs its own logic to update the database, and then lies to the client about the result of the operation. A successful result causes the client to believe that Gerrit has created the ref, but in reality Gerrit hasn’t created the ref at all. [Link - Gerrit, "Gritty Details"].

The Gerrit workflow

After a successful patch (i.e, the patch has been pushed to Gerrit, [putting it into the "Pending Changes" staging area], reviewed, and the review has passed), Gerrit pushes the change from the "Pending Changes" into the "Authoritative Repository", calculating which branch to push it into based on the magic it did when you pushed to refs/for/<BRANCH>. This way, successfully reviewed patches can be pulled directly from the correct branches of the Authoritative Repository.

How to model type-safe enum types?

You can use a sealed abstract class instead of the enumeration, for example:

sealed abstract class Constraint(val name: String, val verifier: Int => Boolean)

case object NotTooBig extends Constraint("NotTooBig", (_ < 1000))
case object NonZero extends Constraint("NonZero", (_ != 0))
case class NotEquals(x: Int) extends Constraint("NotEquals " + x, (_ != x))

object Main {

  def eval(ctrs: Seq[Constraint])(x: Int): Boolean =
    (true /: ctrs){ case (accum, ctr) => accum && ctr.verifier(x) }

  def main(args: Array[String]) {
    val ctrs = NotTooBig :: NotEquals(5) :: Nil
    val evaluate = eval(ctrs) _

    println(evaluate(3000))
    println(evaluate(3))
    println(evaluate(5))
  }

}

enable cors in .htaccess

I tried @abimelex solution, but in Slim 3.0, mapping the OPTIONS requests goes like:

$app = new \Slim\App();
$app->options('/books/{id}', function ($request, $response, $args) {
    // Return response headers
});

https://www.slimframework.com/docs/objects/router.html#options-route

How to set Status Bar Style in Swift 3

Most of these answers are the same thing re-hashed, but none of them actually address the launch screen for me when using a dark background.

I got around this with the following in my info.plist which produced a light styled status bar.

<key>UIStatusBarStyle</key>
<string>UIStatusBarStyleLightContent</string>

Getting the absolute path of the executable, using C#?

var dir = System.IO.Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);

I jumped in for the top rated answer and found myself not getting what I expected. I had to read the comments to find what I was looking for.

For that reason I am posting the answer listed in the comments to give it the exposure it deserves.

int object is not iterable?

Side note: if you want to get the sum of all digits, you can simply do

print sum(int(digit) for digit in raw_input('Enter a number:'))

How to calculate DATE Difference in PostgreSQL?

CAST both fields to datatype DATE and you can use a minus:

(CAST(MAX(joindate) AS date) - CAST(MIN(joindate) AS date)) as DateDifference

Test case:

SELECT  (CAST(MAX(joindate) AS date) - CAST(MIN(joindate) AS date)) as DateDifference
FROM 
    generate_series('2014-01-01'::timestamp, '2014-02-01'::timestamp, interval '1 hour') g(joindate);

Result: 31

Or create a function datediff():

CREATE OR REPLACE FUNCTION datediff(timestamp, timestamp) 
RETURNS int 
LANGUAGE sql 
AS
$$
    SELECT CAST($1 AS date) - CAST($2 AS date) as DateDifference
$$;

IntelliJ can't recognize JavaFX 11 with OpenJDK 11

As mentioned in the comments, the Starting Guide is the place to start with Java 11 and JavaFX 11.

The key to work as you did before Java 11 is to understand that:

  • JavaFX 11 is not part of the JDK anymore
  • You can get it in different flavors, either as an SDK or as regular dependencies (maven/gradle).
  • You will need to include it to the module path of your project, even if your project is not modular.

JavaFX project

If you create a regular JavaFX default project in IntelliJ (without Maven or Gradle) I'd suggest you download the SDK from here. Note that there are jmods as well, but for a non modular project the SDK is preferred.

These are the easy steps to run the default project:

  1. Create a JavaFX project
  2. Set JDK 11 (point to your local Java 11 version)
  3. Add the JavaFX 11 SDK as a library. The URL could be something like /Users/<user>/Downloads/javafx-sdk-11/lib/. Once you do this you will notice that the JavaFX classes are now recognized in the editor.

JavaFX 11 Project

  1. Before you run the default project, you just need to add these to the VM options:

    --module-path /Users/<user>/Downloads/javafx-sdk-11/lib --add-modules=javafx.controls,javafx.fxml

  2. Run

Maven

If you use Maven to build your project, follow these steps:

  1. Create a Maven project with JavaFX archetype
  2. Set JDK 11 (point to your local Java 11 version)
  3. Add the JavaFX 11 dependencies.

    <dependencies>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-controls</artifactId>
            <version>11</version>
        </dependency>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-fxml</artifactId>
            <version>11</version>
        </dependency>
    </dependencies>
    

Once you do this you will notice that the JavaFX classes are now recognized in the editor.

JavaFX 11 Maven project

You will notice that Maven manages the required dependencies for you: it will add javafx.base and javafx.graphics for javafx.controls, but most important, it will add the required classifier based on your platform. In my case, Mac.

This is why your jars org.openjfx:javafx-controls:11 are empty, because there are three possible classifiers (windows, linux and mac platforms), that contain all the classes and the native implementation.

In case you still want to go to your .m2 repo and take the dependencies from there manually, make sure you pick the right one (for instance .m2/repository/org/openjfx/javafx-controls/11/javafx-controls-11-mac.jar)

  1. Replace default maven plugins with those from here.

  2. Run mvn compile javafx:run, and it should work.

Similar works as well for Gradle projects, as explained in detail here.

EDIT

The mentioned Getting Started guide contains updated documentation and sample projects for IntelliJ:

Docker remove <none> TAG images

docker images | grep none | awk '{ print $3; }' | xargs docker rmi

You can try this simply

Format date as dd/MM/yyyy using pipes

The only thing that worked for me was inspired from here: https://stackoverflow.com/a/35527407/2310544

For pure dd/MM/yyyy, this worked for me, with angular 2 beta 16:

{{ myDate | date:'d'}}/{{ myDate | date:'MM'}}/{{ myDate | date:'y'}}

Encode html entities in javascript

htmlentities() converts HTML Entities

So we build a constant that will contain our html tags we want to convert.

const htmlEntities = [ 
    {regex:'&',entity:'&amp;'},
    {regex:'>',entity:'&gt;'},
    {regex:'<',entity:'&lt;'} 
  ];

We build a function that will convert all corresponding html characters to string : Html ==> String

 function htmlentities (s){
    var reg; 
    for (v in htmlEntities) {
      reg = new RegExp(htmlEntities[v].regex, 'g');
      s = s.replace(reg, htmlEntities[v].entity);
    }
    return s;
  }

To decode, we build a reverse function that will convert all string to their equivalent html . String ==> html

 function  html_entities_decode (s){
    var reg; 
    for (v in htmlEntities) {
      reg = new RegExp(htmlEntities[v].entity, 'g');
      s = s.replace(reg, htmlEntities[v].regex);
    }
    return s;
  
   }

After, We can encode all others special characters (é è ...) with encodeURIComponent()

Use Case

 var s  = '<div> God bless you guy   </div> '
 var h = encodeURIComponent(htmlentities(s));         /** To encode */
 h =  html_entities_decode(decodeURIComponent(h));     /** To decode */

Git:nothing added to commit but untracked files present

In case someone cares just about the error nothing added to commit but untracked files present (use "git add" to track) and not about Please move or remove them before you can merge.. You might have a look at the answers on Git - Won't add files?

There you find at least 2 good candidates for the issue in question here: that you either are in a subfolder or in a parent folder, but not in the actual repo folder. If you are in the directory one level too high, this will definitely raise that message "nothing added to commit…", see my answer in the link for details. I do not know if the same message occurs when you are in a subfolder, but it is likely. That could fit to your explanations.

How do you clear the focus in javascript?

document.activeElement.blur();

Works wrong on IE9 - it blurs the whole browser window if active element is document body. Better to check for this case:

if (document.activeElement != document.body) document.activeElement.blur();

Characters allowed in GET parameter

"." | "!" | "~" | "*" | "'" | "(" | ")" are also acceptable [RFC2396]. Really, anything can be in a GET parameter if it is properly encoded.

Call jQuery Ajax Request Each X Minutes

No plugin required. You can use only jquery.

If you want to set something on a timer, you can use JavaScript's setTimeout or setInterval methods:

setTimeout ( expression, timeout );
setInterval ( expression, interval );

How do I disable form fields using CSS?

This can be done for a non-critical purpose by putting an overlay on top of your input element. Here's my example in pure HTML and CSS.

https://jsfiddle.net/1tL40L99/

    <div id="container">
        <input name="name" type="text" value="Text input here" />
        <span id="overlay"></span>
    </div>

    <style>
        #container {
            width: 300px;
            height: 50px;
            position: relative;
        }
        #container input[type="text"] {
            position: relative;
            top: 15px;
            z-index: 1;
            width: 200px;
            display: block;
            margin: 0 auto;
        }
        #container #overlay {
            width: 300px;
            height: 50px;
            position: absolute;
            top: 0px;
            left: 0px;
            z-index: 2;
            background: rgba(255,0,0, .5);
        }
    </style>

Counting the number of non-NaN elements in a numpy ndarray in Python

Quick-to-write alterantive

Even though is not the fastest choice, if performance is not an issue you can use:

sum(~np.isnan(data)).

Performance:

In [7]: %timeit data.size - np.count_nonzero(np.isnan(data))
10 loops, best of 3: 67.5 ms per loop

In [8]: %timeit sum(~np.isnan(data))
10 loops, best of 3: 154 ms per loop

In [9]: %timeit np.sum(~np.isnan(data))
10 loops, best of 3: 140 ms per loop

Serialize JavaScript object into JSON string

var myobject = new MyClass1("5678999", "text");
var dto = { MyClass1: myobject };
console.log(JSON.stringify(dto));

EDIT:

JSON.stringify will stringify all 'properties' of your class. If you want to persist only some of them, you can specify them individually like this:

var dto = { MyClass1: {
    property1: myobject.property1,
    property2: myobject.property2
}};

Concatenating Matrices in R

cbindX from the package gdata combines multiple columns of differing column and row lengths. Check out the page here:

http://hosho.ees.hokudai.ac.jp/~kubo/Rdoc/library/gdata/html/cbindX.html

It takes multiple comma separated matrices and data.frames as input :) You just need to

install.packages("gdata", dependencies=TRUE)

and then

library(gdata)
concat_data <- cbindX(df1, df2, df3) # or cbindX(matrix1, matrix2, matrix3, matrix4)

What is the difference between spark.sql.shuffle.partitions and spark.default.parallelism?

From the answer here, spark.sql.shuffle.partitions configures the number of partitions that are used when shuffling data for joins or aggregations.

spark.default.parallelism is the default number of partitions in RDDs returned by transformations like join, reduceByKey, and parallelize when not set explicitly by the user. Note that spark.default.parallelism seems to only be working for raw RDD and is ignored when working with dataframes.

If the task you are performing is not a join or aggregation and you are working with dataframes then setting these will not have any effect. You could, however, set the number of partitions yourself by calling df.repartition(numOfPartitions) (don't forget to assign it to a new val) in your code.


To change the settings in your code you can simply do:

sqlContext.setConf("spark.sql.shuffle.partitions", "300")
sqlContext.setConf("spark.default.parallelism", "300")

Alternatively, you can make the change when submitting the job to a cluster with spark-submit:

./bin/spark-submit --conf spark.sql.shuffle.partitions=300 --conf spark.default.parallelism=300

How can I convert an integer to a hexadecimal string in C?

To convert an integer to a string also involves char array or memory management.

To handle that part for such short arrays, code could use a compound literal, since C99, to create array space, on the fly. The string is valid until the end of the block.

#define UNS_HEX_STR_SIZE ((sizeof (unsigned)*CHAR_BIT + 3)/4 + 1)
//                         compound literal v--------------------------v
#define U2HS(x) unsigned_to_hex_string((x), (char[UNS_HEX_STR_SIZE]) {0}, UNS_HEX_STR_SIZE)

char *unsigned_to_hex_string(unsigned x, char *dest, size_t size) {
  snprintf(dest, size, "%X", x);
  return dest;
}

int main(void) {
  // 3 array are formed v               v        v
  printf("%s %s %s\n", U2HS(UINT_MAX), U2HS(0), U2HS(0x12345678));
  char *hs = U2HS(rand());
  puts(hs);
  // `hs` is valid until the end of the block
}

Output

FFFFFFFF 0 12345678
5851F42D

Youtube autoplay not working on mobile devices with embedded HTML5 player

Preview The official statement "Due to this restriction, functions and parameters such as autoplay, playVideo(), loadVideoById() won't work in all mobile environments.

Reference: https://developers.google.com/youtube/iframe_api_reference

Why am I getting "(304) Not Modified" error on some links when using HttpWebRequest?

It is not an issue it is because of caching...

To overcome this add a timestamp to your endpoint call, e.g. axios.get('/api/products').

After timestamp it should be axios.get(/api/products?${Date.now()}.

It will resolve your 304 status code.

IOException: The process cannot access the file 'file path' because it is being used by another process

I had the following scenario that was causing the same error:

  • Upload files to the server
  • Then get rid of the old files after they have been uploaded

Most files were small in size, however, a few were large, and so attempting to delete those resulted in the cannot access file error.

It was not easy to find, however, the solution was as simple as Waiting "for the task to complete execution":

using (var wc = new WebClient())
{
   var tskResult = wc.UploadFileTaskAsync(_address, _fileName);
   tskResult.Wait(); 
}

Chrome violation : [Violation] Handler took 83ms of runtime

It seems you have found your solution, but still it will be helpful to others, on this page on point based on Chrome 59.

4.Note the red triangle in the top-right of the Animation Frame Fired event. Whenever you see a red triangle, it's a warning that there may be an issue related to this event.

If you hover on these triangle you can see those are the violation handler errors and as per point 4. yes there is some issue related to that event.

The model item passed into the dictionary is of type .. but this dictionary requires a model item of type

The error means that you're navigating to a view whose model is declared as typeof Foo (by using @model Foo), but you actually passed it a model which is typeof Bar (note the term dictionary is used because a model is passed to the view via a ViewDataDictionary).

The error can be caused by

Passing the wrong model from a controller method to a view (or partial view)

Common examples include using a query that creates an anonymous object (or collection of anonymous objects) and passing it to the view

var model = db.Foos.Select(x => new
{
    ID = x.ID,
    Name = x.Name
};
return View(model); // passes an anonymous object to a view declared with @model Foo

or passing a collection of objects to a view that expect a single object

var model = db.Foos.Where(x => x.ID == id);
return View(model); // passes IEnumerable<Foo> to a view declared with @model Foo

The error can be easily identified at compile time by explicitly declaring the model type in the controller to match the model in the view rather than using var.

Passing the wrong model from a view to a partial view

Given the following model

public class Foo
{
    public Bar MyBar { get; set; }
}

and a main view declared with @model Foo and a partial view declared with @model Bar, then

Foo model = db.Foos.Where(x => x.ID == id).Include(x => x.Bar).FirstOrDefault();
return View(model);

will return the correct model to the main view. However the exception will be thrown if the view includes

@Html.Partial("_Bar") // or @{ Html.RenderPartial("_Bar"); }

By default, the model passed to the partial view is the model declared in the main view and you need to use

@Html.Partial("_Bar", Model.MyBar) // or @{ Html.RenderPartial("_Bar", Model.MyBar); }

to pass the instance of Bar to the partial view. Note also that if the value of MyBar is null (has not been initialized), then by default Foo will be passed to the partial, in which case, it needs to be

@Html.Partial("_Bar", new Bar())

Declaring a model in a layout

If a layout file includes a model declaration, then all views that use that layout must declare the same model, or a model that derives from that model.

If you want to include the html for a separate model in a Layout, then in the Layout, use @Html.Action(...) to call a [ChildActionOnly] method initializes that model and returns a partial view for it.

WPF: ItemsControl with scrollbar (ScrollViewer)

Put your ScrollViewer in a DockPanel and set the DockPanel MaxHeight property

[...]
<DockPanel MaxHeight="700">
  <ScrollViewer VerticalScrollBarVisibility="Auto">
   <ItemsControl ItemSource ="{Binding ...}">
     [...]
   </ItemsControl>
  </ScrollViewer>
</DockPanel>
[...]

JSON forEach get Key and Value

Another easy way to do this is by using the following syntax to iterate through the object, keeping access to the key and value:

for(var key in object){
  console.log(key + ' - ' + object[key])
}

so for yours:

for(var key in obj){
  console.log(key + ' - ' + obj[key])
}

Concatenating variables and strings in React

the best way to concat props/variables:

var sample = "test";    
var result = `this is just a ${sample}`;    
//this is just a test

Configuring RollingFileAppender in log4j

I had a similar problem and just found a way to solve it (by single-stepping through log4j-extras source, no less...)

The good news is that, unlike what's written everywhere, it turns out that you actually CAN configure TimeBasedRollingPolicy using log4j.properties (XML config not needed! At least in versions of log4j >1.2.16 see this bug report)

Here is an example:

log4j.appender.File = org.apache.log4j.rolling.RollingFileAppender
log4j.appender.File.rollingPolicy = org.apache.log4j.rolling.TimeBasedRollingPolicy
log4j.appender.File.rollingPolicy.FileNamePattern = logs/worker-${instanceId}.%d{yyyyMMdd-HHmm}.log

BTW the ${instanceId} bit is something I am using on Amazon's EC2 to distinguish the logs from all my workers -- I just need to set that property before calling PropertyConfigurator.configure(), as follow:

p.setProperty("instanceId", EC2Util.getMyInstanceId());
PropertyConfigurator.configure(p);

Auto Scale TextView Text to Fit within Bounds

Thanks to Chase and onoelle, for the lazy programmers, let me post here a working version of their fantastic merged code, adapted on a Button, instead of a TextView.

Substitute all your Buttons (not ImageButtons) with AutoResizeTextButtons and the same boring problem is fixed for them too.

Here is the code. I just removed the imports.

/**
 *            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
 *                    Version 2, December 2004
 * 
 * Copyright (C) 2004 Sam Hocevar <[email protected]>
 * 
 * Everyone is permitted to copy and distribute verbatim or modified
 * copies of this license document, and changing it is allowed as long
 * as the name is changed.
 * 
 *            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
 *   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
 * 
 *  0. You just DO WHAT THE FUCK YOU WANT TO.
 *  made better by onoelle
 *  adapted for button by beppi
 */

/**
 * Text Button that auto adjusts text size to fit within the view.
 * If the text size equals the minimum text size and still does not
 * fit, append with an ellipsis.
 * 
 * @author Chase Colburn
 * @since Apr 4, 2011
 */
public class AutoResizeTextButton extends Button {

    // Minimum text size for this text view
    public static final float MIN_TEXT_SIZE = 20;

    // Interface for resize notifications
    public interface OnTextResizeListener {
        public void onTextResize(Button textView, float oldSize, float newSize);
    }

    // Our ellipse string
    private static final String mEllipsis = "...";

    // Registered resize listener
    private OnTextResizeListener mTextResizeListener;

    // Flag for text and/or size changes to force a resize
    private boolean mNeedsResize = false;

    // Text size that is set from code. This acts as a starting point for resizing
    private float mTextSize;

    // Temporary upper bounds on the starting text size
    private float mMaxTextSize = 0;

    // Lower bounds for text size
    private float mMinTextSize = MIN_TEXT_SIZE;

    // Text view line spacing multiplier
    private float mSpacingMult = 1.0f;

    // Text view additional line spacing
    private float mSpacingAdd = 0.0f;

    // Add ellipsis to text that overflows at the smallest text size
    private boolean mAddEllipsis = true;

    // Default constructor override
    public AutoResizeTextButton(Context context) {
        this(context, null);
    }

    // Default constructor when inflating from XML file
    public AutoResizeTextButton(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    // Default constructor override
    public AutoResizeTextButton(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mTextSize = getTextSize();
    }

    /**
     * When text changes, set the force resize flag to true and reset the text size.
     */
    @Override
    protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) {
        mNeedsResize = true;
        // Since this view may be reused, it is good to reset the text size
        resetTextSize();
    }

    /**
     * If the text view size changed, set the force resize flag to true
     */
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        if (w != oldw || h != oldh) {
            mNeedsResize = true;
        }
    }

    /**
     * Register listener to receive resize notifications
     * @param listener
     */
    public void setOnResizeListener(OnTextResizeListener listener) {
        mTextResizeListener = listener;
    }

    /**
     * Override the set text size to update our internal reference values
     */
    @Override
    public void setTextSize(float size) {
        super.setTextSize(size);
        mTextSize = getTextSize();
    }

    /**
     * Override the set text size to update our internal reference values
     */
    @Override
    public void setTextSize(int unit, float size) {
        super.setTextSize(unit, size);
        mTextSize = getTextSize();
    }

    /**
     * Override the set line spacing to update our internal reference values
     */
    @Override
    public void setLineSpacing(float add, float mult) {
        super.setLineSpacing(add, mult);
        mSpacingMult = mult;
        mSpacingAdd = add;
    }

    /**
     * Set the upper text size limit and invalidate the view
     * @param maxTextSize
     */
    public void setMaxTextSize(float maxTextSize) {
        mMaxTextSize = maxTextSize;
        requestLayout();
        invalidate();
    }

    /**
     * Return upper text size limit
     * @return
     */
    public float getMaxTextSize() {
        return mMaxTextSize;
    }

    /**
     * Set the lower text size limit and invalidate the view
     * @param minTextSize
     */
    public void setMinTextSize(float minTextSize) {
        mMinTextSize = minTextSize;
        requestLayout();
        invalidate();
    }

    /**
     * Return lower text size limit
     * @return
     */
    public float getMinTextSize() {
        return mMinTextSize;
    }

    /**
     * Set flag to add ellipsis to text that overflows at the smallest text size
     * @param addEllipsis
     */
    public void setAddEllipsis(boolean addEllipsis) {
        mAddEllipsis = addEllipsis;
    }

    /**
     * Return flag to add ellipsis to text that overflows at the smallest text size
     * @return
     */
    public boolean getAddEllipsis() {
        return mAddEllipsis;
    }

    /**
     * Reset the text to the original size
     */
    public void resetTextSize() {
        if(mTextSize > 0) {
            super.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTextSize);
            mMaxTextSize = mTextSize;
        }
    }

    /**
     * Resize text after measuring
     */
    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        if(changed || mNeedsResize) {
            int widthLimit = (right - left) - getCompoundPaddingLeft() - getCompoundPaddingRight();
            int heightLimit = (bottom - top) - getCompoundPaddingBottom() - getCompoundPaddingTop();
            resizeText(widthLimit, heightLimit);
        }
        super.onLayout(changed, left, top, right, bottom);
    }


    /**
     * Resize the text size with default width and height
     */
    public void resizeText() {
        int heightLimit = getHeight() - getPaddingBottom() - getPaddingTop();
        int widthLimit = getWidth() - getPaddingLeft() - getPaddingRight();
        resizeText(widthLimit, heightLimit);
    }

    /**
     * Resize the text size with specified width and height
     * @param width
     * @param height
     */
    public void resizeText(int width, int height) {
        CharSequence text = getText();
        // Do not resize if the view does not have dimensions or there is no text
        if(text == null || text.length() == 0 || height <= 0 || width <= 0 || mTextSize == 0) {
            return;
        }

        // Get the text view's paint object
        TextPaint textPaint = getPaint();

        // Store the current text size
        float oldTextSize = textPaint.getTextSize();
        // If there is a max text size set, use the lesser of that and the default text size
        float targetTextSize = mMaxTextSize > 0 ? Math.min(mTextSize, mMaxTextSize) : mTextSize;

        // Get the required text height
        int textHeight = getTextHeight(text, textPaint, width, targetTextSize);

        // Until we either fit within our text view or we had reached our min text size, incrementally try smaller sizes
        while(textHeight > height && targetTextSize > mMinTextSize) {
            targetTextSize = Math.max(targetTextSize - 2, mMinTextSize);
            textHeight = getTextHeight(text, textPaint, width, targetTextSize);
        }

        // If we had reached our minimum text size and still don't fit, append an ellipsis
        if(mAddEllipsis && targetTextSize == mMinTextSize && textHeight > height) {
            // Draw using a static layout
            // modified: use a copy of TextPaint for measuring
            TextPaint paint = new TextPaint(textPaint);
            StaticLayout layout = new StaticLayout(text, paint, width, Alignment.ALIGN_NORMAL, mSpacingMult, mSpacingAdd, false);
            // Check that we have a least one line of rendered text
            if(layout.getLineCount() > 0) {
                // Since the line at the specific vertical position would be cut off,
                // we must trim up to the previous line
                int lastLine = layout.getLineForVertical(height) - 1;
                // If the text would not even fit on a single line, clear it
                if(lastLine < 0) {
                    setText("");
                }
                // Otherwise, trim to the previous line and add an ellipsis
                else {
                    int start = layout.getLineStart(lastLine);
                    int end = layout.getLineEnd(lastLine);
                    float lineWidth = layout.getLineWidth(lastLine);
                    float ellipseWidth = textPaint.measureText(mEllipsis);

                    // Trim characters off until we have enough room to draw the ellipsis
                    while(width < lineWidth + ellipseWidth) {
                        lineWidth = textPaint.measureText(text.subSequence(start, --end + 1).toString());
                    }
                    setText(text.subSequence(0, end) + mEllipsis);
                }
            }
        }

        // Some devices try to auto adjust line spacing, so force default line spacing
        // and invalidate the layout as a side effect
//      textPaint.setTextSize(targetTextSize);
     // modified: setting text size via this.setTextSize (instead of textPaint.setTextSize(targetTextSize))
        setTextSize(TypedValue.COMPLEX_UNIT_PX, targetTextSize);
        setLineSpacing(mSpacingAdd, mSpacingMult);

        // Notify the listener if registered
        if(mTextResizeListener != null) {
            mTextResizeListener.onTextResize(this, oldTextSize, targetTextSize);
        }

        // Reset force resize flag
        mNeedsResize = false;
    }

    // Set the text size of the text paint object and use a static layout to render text off screen before measuring
    private int getTextHeight(CharSequence source, TextPaint originalPaint, int width, float textSize) {
          // modified: make a copy of the original TextPaint object for measuring
          // (apparently the object gets modified while measuring, see also the
          // docs for TextView.getPaint() (which states to access it read-only)
        // Update the text paint object
          TextPaint paint = new TextPaint(originalPaint);
        paint.setTextSize(textSize);
        // Measure using a static layout
        StaticLayout layout = new StaticLayout(source, paint, width, Alignment.ALIGN_NORMAL, mSpacingMult, mSpacingAdd, true);
        return layout.getHeight();
    }

}

Usage:

put a AutoResizeTextButton inside your xml in replace of a normal Button, without changing anything else. Inside the onCreate() put (for example):

    myButton = (AutoResizeTextButton)getView().findViewById(id.myButton);
    myButton.setMinTextSize(8f);
    myButton.resizeText();

How to create a cron job using Bash automatically without the interactive editor?

EDIT (fixed overwriting):

cat <(crontab -l) <(echo "1 2 3 4 5 scripty.sh") | crontab -

Simple way to query connected USB devices info in Python?

When I run your code, I get the following output for example.

<usb.Device object at 0xef38c0>
Device: 001
  idVendor: 7531 (0x1d6b)
  idProduct: 1 (0x0001)
Manufacturer: 3
Serial: 1
Product: 2

Noteworthy are that a) I have usb.Device objects whereas you have usb.legacy.Device objects, and b) I have device filenames.

Each usb.Bus has a dirname field and each usb.Device has the filename. As you can see, the filename is something like 001, and so is the dirname. You can combine these to get the bus file. For dirname=001 and filname=001, it should be something like /dev/bus/usb/001/001.

You should first, though figure out what this "usb.legacy" situation is. I'm running the latest version and I don't even have a legacy sub-module.

Finally, you should use the idVendor and idProduct fields to uniquely identify the device when it's plugged in.

Setting maxlength of textbox with JavaScript or jQuery

The max length property is camel-cased: maxLength

jQuery doesn't come with a maxlength method by default. Also, your document ready function isn't technically correct:

$(document).ready(function () {
    $("#ms_num")[0].maxLength = 6;
    // OR:
    $("#ms_num").attr('maxlength', 6);
    // OR you can use prop if you are using jQuery 1.6+:
    $("#ms_num").prop('maxLength', 6);
});

Also, since you are using jQuery, you can rewrite your code like this (taking advantage of jQuery 1.6+):

$('input').each(function (index) {
    var element = $(this);
    if (index === 1) {
        element.prop('maxLength', 3);
    } else if (element.is(':radio') || element.is(':checkbox')) {
        element.prop('maxLength', 5);
    }
});

$(function() {
    $("#ms_num").prop('maxLength', 6);
});

Format price in the current locale and currency

For formatting the price in another currency than the current one:

Mage::app()->getLocale()->currency('EUR')->toCurrency($price);

Can I have multiple Xcode versions installed?

Whatever advice path you go down, make a copy of your project folder, and rename the external most one to reflect what XCode version it is being opened in. Your choice on whether you want it to update syntax or not, but the main reason for all this bovver is your storyboard will be altered just by looking. It may be resolved by the time a new reader coming across this in the future, or

Oracle: how to add minutes to a timestamp?

In addition to being able to add a number of days to a date, you can use interval data types assuming you are on Oracle 9i or later, which can be somewhat easier to read,

SQL> ed
Wrote file afiedt.buf
SELECT sysdate, sysdate + interval '30' minute FROM dual
SQL> /

SYSDATE              SYSDATE+INTERVAL'30'
-------------------- --------------------
02-NOV-2008 16:21:40 02-NOV-2008 16:51:40

Do checkbox inputs only post data if they're checked?

I resolved the problem with this code:

HTML Form

<input type="checkbox" id="is-business" name="is-business" value="off" onclick="changeValueCheckbox(this)" >
<label for="is-business">Soy empresa</label>

and the javascript function by change the checkbox value form:

//change value of checkbox element
function changeValueCheckbox(element){
   if(element.checked){
    element.value='on';
  }else{
    element.value='off';
  }
}

and the server checked if the data post is "on" or "off". I used playframework java

        final Map<String, String[]> data = request().body().asFormUrlEncoded();

        if (data.get("is-business")[0].equals('on')) {
            login.setType(new MasterValue(Login.BUSINESS_TYPE));
        } else {
            login.setType(new MasterValue(Login.USER_TYPE));
        }

How to set IntelliJ IDEA Project SDK

For a new project select the home directory of the jdk

eg C:\Java\jdk1.7.0_99 or C:\Program Files\Java\jdk1.7.0_99

For an existing project.

1) You need to have a jdk installed on the system.

for instance in

C:\Java\jdk1.7.0_99

2) go to project structure under File menu ctrl+alt+shift+S

3) SDKs is located under Platform Settings. Select it.

4) click the green + up the top of the window.

5) select JDK (I have to use keyboard to select it do not know why).

select the home directory for your jdk installation.

should be good to go.

Operation is not valid due to the current state of the object, when I select a dropdown list

From http://codecorner.galanter.net/2012/06/04/solution-for-operation-is-not-valid-due-to-the-current-state-of-the-object-error/

Issue happens because Microsoft Security Update MS11-100 limits number of keys in Forms collection during HTTP POST request. To alleviate this problem you need to increase that number.

This can be done in your application Web.Config in the <appSettings> section (create the section directly under <configuration> if it doesn’t exist). Add 2 lines similar to the lines below to the section:

<add key="aspnet:MaxHttpCollectionKeys" value="2000" />
<add key="aspnet:MaxJsonDeserializerMembers" value="2000" />

The above example set the limit to 2000 keys. This will lift the limitation and the error should go away.

C compile error: "Variable-sized object may not be initialized"

int size=5;
int ar[size ]={O};

/* This  operation gives an error -  
variable sized array may not be 
initialised.  Then just try this. 
*/
int size=5,i;
int ar[size];
for(i=0;i<size;i++)
{
    ar[i]=0;
}

Slide div left/right using jQuery

You can easy get that effect without using jQueryUI, for example:

$(document).ready(function(){
    $('#slide').click(function(){
    var hidden = $('.hidden');
    if (hidden.hasClass('visible')){
        hidden.animate({"left":"-1000px"}, "slow").removeClass('visible');
    } else {
        hidden.animate({"left":"0px"}, "slow").addClass('visible');
    }
    });
});

Try this working Fiddle:

http://jsfiddle.net/ZQTFq/

How can I display an RTSP video stream in a web page?

Also you can try opensource WebRTC Media Server Kurento

Which can play RTSP video stream and send it to WebRTC or transcode to RTMP or saving on server.

We are useing it on Production for the following cases:

 - WebRTC to Webrtc (many to many)
 - WebRTC to RTMP
 - RTSP to WebRTC

size of NumPy array

Yes numpy has a size function, and shape and size are not quite the same.

Input

import numpy as np
data = [[1, 2, 3, 4], [5, 6, 7, 8]]
arrData = np.array(data)

print(data)
print(arrData.size)
print(arrData.shape)

Output

[[1, 2, 3, 4], [5, 6, 7, 8]]

8 # size

(2, 4) # shape

How to change the remote repository for a git submodule?

In simple terms, you just need to edit the .gitmodules file, then resync and update:

Edit the file, either via a git command or directly:

git config --file=.gitmodules -e

or just:

vim .gitmodules

then resync and update:

git submodule sync
git submodule update --init --recursive --remote

java.util.MissingResourceException: Can't find bundle for base name 'property_file name', locale en_US

just right click on the project file in eclipse and in build path select "Use as source folder"...It worked for me

Read all files in a folder and apply a function to each data frame

On the contrary, I do think working with list makes it easy to automate such things.

Here is one solution (I stored your four dataframes in folder temp/).

filenames <- list.files("temp", pattern="*.csv", full.names=TRUE)
ldf <- lapply(filenames, read.csv)
res <- lapply(ldf, summary)
names(res) <- substr(filenames, 6, 30)

It is important to store the full path for your files (as I did with full.names), otherwise you have to paste the working directory, e.g.

filenames <- list.files("temp", pattern="*.csv")
paste("temp", filenames, sep="/")

will work too. Note that I used substr to extract file names while discarding full path.

You can access your summary tables as follows:

> res$`df4.csv`
       A              B        
 Min.   :0.00   Min.   : 1.00  
 1st Qu.:1.25   1st Qu.: 2.25  
 Median :3.00   Median : 6.00  
 Mean   :3.50   Mean   : 7.00  
 3rd Qu.:5.50   3rd Qu.:10.50  
 Max.   :8.00   Max.   :16.00  

If you really want to get individual summary tables, you can extract them afterwards. E.g.,

for (i in 1:length(res))
  assign(paste(paste("df", i, sep=""), "summary", sep="."), res[[i]])

What does double question mark (??) operator mean in PHP

It's the "null coalescing operator", added in php 7.0. The definition of how it works is:

It returns its first operand if it exists and is not NULL; otherwise it returns its second operand.

So it's actually just isset() in a handy operator.

Those two are equivalent1:

$foo = $bar ?? 'something';
$foo = isset($bar) ? $bar : 'something';

Documentation: http://php.net/manual/en/language.operators.comparison.php#language.operators.comparison.coalesce

In the list of new PHP7 features: http://php.net/manual/en/migration70.new-features.php#migration70.new-features.null-coalesce-op

And original RFC https://wiki.php.net/rfc/isset_ternary


EDIT: As this answer gets a lot of views, little clarification:

1There is a difference: In case of ??, the first expression is evaluated only once, as opposed to ? :, where the expression is first evaluated in the condition section, then the second time in the "answer" section.

How do you read scanf until EOF in C?

Scanf is pretty much always more trouble than it's worth. Here are two better ways to do what you're trying to do. This first one is a more-or-less direct translation of your code. It's longer, but you can look at it and see clearly what it does, unlike with scanf.

#include <stdio.h>
#include <ctype.h>
int main(void)
{
    char buf[1024], *p, *q;
    while (fgets(buf, 1024, stdin))
    {
        p = buf;
        while (*p)
        {
            while (*p && isspace(*p)) p++;
            q = p;
            while (*q && !isspace(*q)) q++;
            *q = '\0';
            if (p != q)
                puts(p);
            p = q;
        }
    }
    return 0;
}

And here's another version. It's a little harder to see what this does by inspection, but it does not break if a line is longer than 1024 characters, so it's the code I would use in production. (Well, really what I would use in production is tr -s '[:space:]' '\n', but this is how you implement something like that.)

#include <stdio.h>
#include <ctype.h>
int main(void)
{
    int ch, lastch = '\0';
    while ((ch = getchar()) != EOF)
    {
        if (!isspace(ch))
            putchar(ch);
        if (!isspace(lastch))
            putchar('\n');
        lastch = ch;
    }
    if (lastch != '\0' && !isspace(lastch))
        putchar('\n');
    return 0;
}

What's the difference between a null pointer and a void pointer?

They are two different concepts: "void pointer" is a type (void *). "null pointer" is a pointer that has a value of zero (NULL). Example:

void *pointer = NULL;

That's a NULL void pointer.

Set value to currency in <input type="number" />

You guys are completely right numbers can only go in the numeric field. I use the exact same thing as already listed with a bit of css styling on a span tag:

<span>$</span><input type="number" min="0.01" step="0.01" max="2500" value="25.67">

Then add a bit of styling magic:

span{
  position:relative;
  margin-right:-20px
}
input[type='number']{
  padding-left:20px;
  text-align:left;
}

Android Webview - Webpage should fit the device screen

Making Changes to the answer by danh32 since the display.getWidth(); is now deprecated.

private int getScale(){
    Point p = new Point();
    Display display = ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay(); 
    display.getSize(p);
    int width = p.x; 
    Double val = new Double(width)/new Double(PIC_WIDTH);
    val = val * 100d;
    return val.intValue();
}

Then use

WebView web = new WebView(this);
web.setPadding(0, 0, 0, 0);
web.setInitialScale(getScale());

Why do many examples use `fig, ax = plt.subplots()` in Matplotlib/pyplot/python

As a supplement to the question and above answers there is also an important difference between plt.subplots() and plt.subplot(), notice the missing 's' at the end.

One can use plt.subplots() to make all their subplots at once and it returns the figure and axes (plural of axis) of the subplots as a tuple. A figure can be understood as a canvas where you paint your sketch.

# create a subplot with 2 rows and 1 columns
fig, ax = plt.subplots(2,1)

Whereas, you can use plt.subplot() if you want to add the subplots separately. It returns only the axis of one subplot.

fig = plt.figure() # create the canvas for plotting
ax1 = plt.subplot(2,1,1) 
# (2,1,1) indicates total number of rows, columns, and figure number respectively
ax2 = plt.subplot(2,1,2)

However, plt.subplots() is preferred because it gives you easier options to directly customize your whole figure

# for example, sharing x-axis, y-axis for all subplots can be specified at once
fig, ax = plt.subplots(2,2, sharex=True, sharey=True)

Shared axes whereas, with plt.subplot(), one will have to specify individually for each axis which can become cumbersome.

Add border-bottom to table row <tr>

HTML

<tr class="bottom-border">
</tr>

CSS

tr.bottom-border {
  border-bottom: 1px solid #222;
}

JAX-WS and BASIC authentication, when user names and passwords are in a database

For an example using both, authentication on application level and HTTP Basic Authentication see one of my previous posts.

XAMPP PORT 80 is Busy / EasyPHP error in Apache configuration file:

SQL Server Reporting Services (SSRS)
SSRS can remain active even if you uninstall SQL Server.
To stop the service:

Open SQL Server Configuration Manager. Select “SQL Server Services” in the left-hand pane. Double-click “SQL Server Reporting Services”. Hit Stop. Switch to the Service tab and set the Start Mode to “Manual”.


Skype
Irritatingly, Skype can switch to port 80. To disable it, select
Tools > Options > Advanced > Connection then uncheck
“Use port 80 and 443 as alternatives for incoming connections”.


IIS (Microsoft Internet Information Server)

For Windows 7 (or vista) its the most likely culprit. You can stop the service from the command line.

Open command line cmd.exe and type:

net stop was /y

For older versions of Windows type:

net stop iisadmin /y

Other

If this does not solve the problem further detective work is necessary if IIS, SSRS and Skype are not to blame. Enter the following on the command line:

netstat -ao

The active TCP addresses and ports will be listed. Locate the line with local address “0.0.0.0:80" and note the PID value. Start Task Manager. Navigate to the Processes tab and, if necessary, click View > Select Columns to ensure “PID (Process Identifier)” is checked. You can now locate the PID you noted above. The description and properties should help you determine which application is using the port.

Using Mysql WHERE IN clause in codeigniter

Try this one:

$this->db->select("*");
$this->db->where_in("(SELECT trans_id FROM myTable WHERE code = 'B')");
$this->db->where('code !=', 'B');
$this->db->get('myTable');

Note: $this->db->select("*"); is optional when you are selecting all columns from table

Optimal number of threads per core

If your threads don't do I/O, synchronization, etc., and there's nothing else running, 1 thread per core will get you the best performance. However that very likely not the case. Adding more threads usually helps, but after some point, they cause some performance degradation.

Not long ago, I was doing performance testing on a 2 quad-core machine running an ASP.NET application on Mono under a pretty decent load. We played with the minimum and maximum number of threads and in the end we found out that for that particular application in that particular configuration the best throughput was somewhere between 36 and 40 threads. Anything outside those boundaries performed worse. Lesson learned? If I were you, I would test with different number of threads until you find the right number for your application.

One thing for sure: 4k threads will take longer. That's a lot of context switches.

How to calculate percentage when old value is ZERO

If you're required to show growth as a percentage it's customary to display [NaN] or something similar in these cases. A growth rate, on the other hand, would be reported in this case as $/month. So in your example for April the growth rate would be calculated as ((20-0)/1.

In any event, determining the correct method for reporting this special case is a user decision. Is it covered in your user requirements?

Remove border radius from Select tag in bootstrap 3

You can use -webkit-border-radius: 0;. Like this:-

-webkit-border-radius: 0;
border: 0;
outline: 1px solid grey;
outline-offset: -1px;

This will give square corners as well as dropdown arrows. Using -webkit-appearance: none; is not recommended as it will turn off all the styling done by Chrome.

How to watch and compile all TypeScript sources?

Create a file named tsconfig.json in your project root and include following lines in it:

{
    "compilerOptions": {
        "emitDecoratorMetadata": true,
        "module": "commonjs",
        "target": "ES5",
        "outDir": "ts-built",
        "rootDir": "src"
    }
}

Please note that outDir should be the path of the directory to receive compiled JS files, and rootDir should be the path of the directory containing your source (.ts) files.

Open a terminal and run tsc -w, it'll compile any .ts file in src directory into .js and store them in ts-built directory.

CreateProcess error=206, The filename or extension is too long when running main() method

If you create your own build file rather than using Project -> Generate Javadocs you can add useexternalfile="yes" to the javadoc task, which is designed specifically to solve this problem.

How can I get the external SD card path for Android 4.0+?

Actually in some devices the external sdcard default name is showing as extSdCard and for other it is sdcard1.

This code snippet helps to find out that exact path and helps to retrieve you the path of external device.

String sdpath,sd1path,usbdiskpath,sd0path;    
        if(new File("/storage/extSdCard/").exists())
            {
               sdpath="/storage/extSdCard/";
               Log.i("Sd Cardext Path",sdpath);
            }
        if(new File("/storage/sdcard1/").exists())
         {
              sd1path="/storage/sdcard1/";
              Log.i("Sd Card1 Path",sd1path);
         }
        if(new File("/storage/usbcard1/").exists())
         {
              usbdiskpath="/storage/usbcard1/";
              Log.i("USB Path",usbdiskpath);
         }
        if(new File("/storage/sdcard0/").exists())
         {
              sd0path="/storage/sdcard0/";
              Log.i("Sd Card0 Path",sd0path);
         }

How to retrieve inserted id after inserting row in SQLite using Python?

You could use cursor.lastrowid (see "Optional DB API Extensions"):

connection=sqlite3.connect(':memory:')
cursor=connection.cursor()
cursor.execute('''CREATE TABLE foo (id integer primary key autoincrement ,
                                    username varchar(50),
                                    password varchar(50))''')
cursor.execute('INSERT INTO foo (username,password) VALUES (?,?)',
               ('test','test'))
print(cursor.lastrowid)
# 1

If two people are inserting at the same time, as long as they are using different cursors, cursor.lastrowid will return the id for the last row that cursor inserted:

cursor.execute('INSERT INTO foo (username,password) VALUES (?,?)',
               ('blah','blah'))

cursor2=connection.cursor()
cursor2.execute('INSERT INTO foo (username,password) VALUES (?,?)',
               ('blah','blah'))

print(cursor2.lastrowid)        
# 3
print(cursor.lastrowid)
# 2

cursor.execute('INSERT INTO foo (id,username,password) VALUES (?,?,?)',
               (100,'blah','blah'))
print(cursor.lastrowid)
# 100

Note that lastrowid returns None when you insert more than one row at a time with executemany:

cursor.executemany('INSERT INTO foo (username,password) VALUES (?,?)',
               (('baz','bar'),('bing','bop')))
print(cursor.lastrowid)
# None

JavaScript: Collision detection

//Off the cuff, Prototype style. 
//Note, this is not optimal; there should be some basic partitioning and caching going on. 
(function () { 
    var elements = []; 
    Element.register = function (element) { 
        for (var i=0; i<elements.length; i++) { 
            if (elements[i]==element) break; 
        } 
        elements.push(element); 
        if (arguments.length>1)  
            for (var i=0; i<arguments.length; i++)  
                Element.register(arguments[i]); 
    }; 
    Element.collide = function () { 
        for (var outer=0; outer < elements.length; outer++) { 
            var e1 = Object.extend( 
                $(elements[outer]).positionedOffset(), 
                $(elements[outer]).getDimensions() 
            ); 
            for (var inner=outer; inner<elements.length; innter++) { 
                var e2 = Object.extend( 
                    $(elements[inner]).positionedOffset(), 
                    $(elements[inner]).getDimensions() 
                ); 
                if (     
                    (e1.left+e1.width)>=e2.left && e1.left<=(e2.left+e2.width) && 
                    (e1.top+e1.height)>=e2.top && e1.top<=(e2.top+e2.height) 
                ) { 
                    $(elements[inner]).fire(':collision', {element: $(elements[outer])}); 
                    $(elements[outer]).fire(':collision', {element: $(elements[inner])}); 
                } 
            } 
        } 
    }; 
})(); 

//Usage: 
Element.register(myElementA); 
Element.register(myElementB); 
$(myElementA).observe(':collision', function (ev) { 
    console.log('Damn, '+ev.memo.element+', that hurt!'); 
}); 
//detect collisions every 100ms 
setInterval(Element.collide, 100);

How do I find the current executable filename?

In addition to the answers above.

I wrote following test.exe as console application

static void Main(string[] args) {
  Console.WriteLine(
    System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName);
  Console.WriteLine(
    System.Reflection.Assembly.GetEntryAssembly().Location);
  Console.WriteLine(
    System.Reflection.Assembly.GetExecutingAssembly().Location);
  Console.WriteLine(
    System.Reflection.Assembly.GetCallingAssembly().Location);
}

Then I compiled the project and renamed its output to the test2.exe file. The output lines were correct and the same.

But, if I start it in the Visual Studio, the result is:

d:\test2.vhost.exe

d:\test2.exe

d:\test2.exe

C:\Windows\Microsoft.NET\Framework\v2.0.50727\mscorlib.dll

The ReSharper plug-in to the Visual Studio has underlined the

System.Diagnostics.Process.GetCurrentProcess().MainModule

as possible System.NullReferenceException. If you look into documentation of the MainModule you will find that this property can throw also NotSupportedException, PlatformNotSupportedException and InvalidOperationException.

The GetEntryAssembly method is also not 100% "safe". MSDN:

The GetEntryAssembly method can return null when a managed assembly has been loaded from an unmanaged application. For example, if an unmanaged application creates an instance of a COM component written in C#, a call to the GetEntryAssembly method from the C# component returns null, because the entry point for the process was unmanaged code rather than a managed assembly.

For my solutions, I prefer the Assembly.GetEntryAssembly().Location.

More interest is if need to solve the problem for the virtualization. For example, we have a project, where we use a Xenocode Postbuild to link the .net code into one executable. This executable must be renamed. So all the methods above didn't work, because they only gets the information for the original assembly or inner process.

The only solution I found is

var location = System.Reflection.Assembly.GetEntryAssembly().Location;
var directory = System.IO.Path.GetDirectoryName(location);
var file = System.IO.Path.Combine(directory, 
  System.Diagnostics.Process.GetCurrentProcess().ProcessName + ".exe");

Truncate with condition

You can simply export the table with a query clause using datapump and import it back with table_exists_action=replace clause. Its will drop and recreate your table and take very less time. Please read about it before implementing.

How to pipe list of files returned by find command to cat to view all the files

I use something like this:

find . -name <filename> -print0 | xargs -0 cat | grep <word2search4>

"-print0" argument for "find" and "-0" argument for "xargs" are needed to handle whitespace in file paths/names correctly.

Count number of rows by group using dplyr

Another option, not necesarily more elegant, but does not require to refer to a specific column:

mtcars %>% 
  group_by(cyl, gear) %>%
  do(data.frame(nrow=nrow(.)))

How can I initialize C++ object member variables in the constructor?

I know this is 5 years later, but the replies above don't address what was wrong with your software. (Well, Yuushi's does, but I didn't realise until I had typed this - doh!). They answer the question in the title How can I initialize C++ object member variables in the constructor? This is about the other questions: Am I using the right approach but the wrong syntax? Or should I be coming at this from a different direction?

Programming style is largely a matter of opinion, but an alternative view to doing as much as possible in a constructor is to keep constructors down to a bare minimum, often having a separate initialization function. There is no need to try to cram all initialization into a constructor, never mind trying to force things at times into the constructors initialization list.

So, to the point, what was wrong with your software?

private:
    ThingOne* ThingOne;
    ThingTwo* ThingTwo;

Note that after these lines, ThingOne (and ThingTwo) now have two meanings, depending on context.

Outside of BigMommaClass, ThingOne is the class you created with #include "ThingOne.h"

Inside BigMommaClass, ThingOne is a pointer.

That is assuming the compiler can even make sense of the lines and doesn't get stuck in a loop thinking that ThingOne is a pointer to something which is itself a pointer to something which is a pointer to ...

Later, when you write

this->ThingOne = ThingOne(100);
this->ThingTwo = ThingTwo(numba1, numba2);

bear in mind that inside of BigMommaClass your ThingOne is a pointer.

If you change the declarations of the pointers to include a prefix (p)

private:
    ThingOne* pThingOne;
    ThingTwo* pThingTwo;

Then ThingOne will always refer to the class and pThingOne to the pointer.

It is then possible to rewrite

this->ThingOne = ThingOne(100);
this->ThingTwo = ThingTwo(numba1, numba2);

as

pThingOne = new ThingOne(100);
pThingTwo = new ThingTwo(numba1, numba2);

which corrects two problems: the double meaning problem, and the missing new. (You can leave this-> if you like!)

With that in place, I can add the following lines to a C++ program of mine and it compiles nicely.

class ThingOne{public:ThingOne(int n){};};
class ThingTwo{public:ThingTwo(int x, int y){};};

class BigMommaClass {

    public:
            BigMommaClass(int numba1, int numba2);

    private:
            ThingOne* pThingOne;
            ThingTwo* pThingTwo;
};

BigMommaClass::BigMommaClass(int numba1, int numba2)
{
    pThingOne = new ThingOne(numba1 + numba2);
    pThingTwo = new ThingTwo(numba1, numba2);
};

When you wrote

this->ThingOne = ThingOne(100);
this->ThingTwo = ThingTwo(numba1, numba2);

the use of this-> tells the compiler that the left hand side ThingOne is intended to mean the pointer. However we are inside BigMommaClass at the time and it's not necessary.

The problem is with the right hand side of the equals where ThingOne is intended to mean the class. So another way to rectify your problems would have been to write

this->ThingOne = new ::ThingOne(100);
this->ThingTwo = new ::ThingTwo(numba1, numba2);

or simply

ThingOne = new ::ThingOne(100);
ThingTwo = new ::ThingTwo(numba1, numba2);

using :: to change the compiler's interpretation of the identifier.

Javascript : natural sort of alphanumerical strings

To compare values you can use a comparing method-

function naturalSorter(as, bs){
    var a, b, a1, b1, i= 0, n, L,
    rx=/(\.\d+)|(\d+(\.\d+)?)|([^\d.]+)|(\.\D+)|(\.$)/g;
    if(as=== bs) return 0;
    a= as.toLowerCase().match(rx);
    b= bs.toLowerCase().match(rx);
    L= a.length;
    while(i<L){
        if(!b[i]) return 1;
        a1= a[i],
        b1= b[i++];
        if(a1!== b1){
            n= a1-b1;
            if(!isNaN(n)) return n;
            return a1>b1? 1:-1;
        }
    }
    return b[i]? -1:0;
}

But for speed in sorting an array, rig the array before sorting, so you only have to do lower case conversions and the regular expression once instead of in every step through the sort.

function naturalSort(ar, index){
    var L= ar.length, i, who, next, 
    isi= typeof index== 'number', 
    rx=  /(\.\d+)|(\d+(\.\d+)?)|([^\d.]+)|(\.(\D+|$))/g;
    function nSort(aa, bb){
        var a= aa[0], b= bb[0], a1, b1, i= 0, n, L= a.length;
        while(i<L){
            if(!b[i]) return 1;
            a1= a[i];
            b1= b[i++];
            if(a1!== b1){
                n= a1-b1;
                if(!isNaN(n)) return n;
                return a1>b1? 1: -1;
            }
        }
        return b[i]!= undefined? -1: 0;
    }
    for(i= 0; i<L; i++){
        who= ar[i];
        next= isi? ar[i][index] || '': who;
        ar[i]= [String(next).toLowerCase().match(rx), who];
    }
    ar.sort(nSort);
    for(i= 0; i<L; i++){
        ar[i]= ar[i][1];
    }
}

How to turn NaN from parseInt into 0 for an empty string?

You can also use the isNaN() function:

var s = ''
var num = isNaN(parseInt(s)) ? 0 : parseInt(s)

How do I debug error ECONNRESET in Node.js?

Try adding these options to socket.io:

const options = { transports: ['websocket'], pingTimeout: 3000, pingInterval: 5000 };

I hope this will help you !

How do you install Google frameworks (Play, Accounts, etc.) on a Genymotion virtual device?

Now there is official FAQ for using Google Play in How do I install Google Play Services?, here the FAQ text:

For intellectual property reasons, Google Play Services are not included by default in Genymotion virtual devices. However, if you really need them, you can use the packages provided by OpenGapps. Simply follow these steps:

  1. Visit opengapps.org
  2. Select x86 as platform
  3. Choose the Android version corresponding to your virtual device
  4. Select nano as variant
  5. Download the zip file
  6. Drag & Drop the zip installer in new Genymotion virtual device (2.7.2 and above only)
  7. Follow the pop-up instructions

Please note Genymobile Inc. and Genymotion assume no liability whatsoever resulting from the download, install and use of Google Play Services within your virtual devices. You are solely responsible for the use and assume all liability related thereto. Moreover, we disclaim any warranties of any kind for a particular purpose regarding the compatibility of the OpenGapps packages with any version of Genymotion.

How to center a Window in Java?

I finally got this bunch of codes to work in NetBeans using Swing GUI Forms in order to center main jFrame:

package my.SampleUIdemo;
import java.awt.*;

public class classSampleUIdemo extends javax.swing.JFrame {
    /// 
    public classSampleUIdemo() {
        initComponents();
        CenteredFrame(this);  // <--- Here ya go.
    }
    // ...
    // void main() and other public method declarations here...

    ///  modular approach
    public void CenteredFrame(javax.swing.JFrame objFrame){
        Dimension objDimension = Toolkit.getDefaultToolkit().getScreenSize();
        int iCoordX = (objDimension.width - objFrame.getWidth()) / 2;
        int iCoordY = (objDimension.height - objFrame.getHeight()) / 2;
        objFrame.setLocation(iCoordX, iCoordY); 
    } 

}

OR

package my.SampleUIdemo;
import java.awt.*;

public class classSampleUIdemo extends javax.swing.JFrame {
        /// 
        public classSampleUIdemo() {
            initComponents(); 
            //------>> Insert your code here to center main jFrame.
            Dimension objDimension = Toolkit.getDefaultToolkit().getScreenSize();
            int iCoordX = (objDimension.width - this.getWidth()) / 2;
            int iCoordY = (objDimension.height - this.getHeight()) / 2;
            this.setLocation(iCoordX, iCoordY); 
            //------>> 
        } 
        // ...
        // void main() and other public method declarations here...

}

OR

    package my.SampleUIdemo;
    import java.awt.*;
    public class classSampleUIdemo extends javax.swing.JFrame {
         /// 
         public classSampleUIdemo() {
             initComponents();
             this.setLocationRelativeTo(null);  // <<--- plain and simple
         }
         // ...
         // void main() and other public method declarations here...
   }

lambda expression for exists within list

I would look at the Join operator:

from r in list join i in listofIds on r.Id equals i select r

I'm not sure how this would be optimized over the Contains methods, but at least it gives the compiler a better idea of what you're trying to do. It's also sematically closer to what you're trying to achieve.

Edit: Extension method syntax for completeness (now that I've figured it out):

var results = listofIds.Join(list, i => i, r => r.Id, (i, r) => r);

How do I create a list of random numbers without duplicates?

import random
result=[]
for i in range(1,50):
    rng=random.randint(1,20)
    result.append(rng)

Why number 9 in kill -9 command in unix?

There’s a very long list of Unix signals, which you can view on Wikipedia. Somewhat confusingly, you can actually use kill to send any signal to a process. For instance, kill -SIGSTOP 12345 forces process 12345 to pause its execution, while kill -SIGCONT 12345 tells it to resume. A slightly less cryptic version of kill -9 is kill -SIGKILL.

In Java, should I escape a single quotation mark (') in String (double quoted)?

It's best practice only to escape the quotes when you need to - if you can get away without escaping it, then do!

The only times you should need to escape are when trying to put " inside a string, or ' in a character:

String quotes = "He said \"Hello, World!\"";
char quote = '\'';

How to compile a 32-bit binary on a 64-bit linux machine with gcc/cmake

For any complex application, I suggest to use an lxc container. lxc containers are 'something in the middle between a chroot on steroids and a full fledged virtual machine'.

For example, here's a way to build 32-bit wine using lxc on an Ubuntu Trusty system:

sudo apt-get install lxc lxc-templates
sudo lxc-create -t ubuntu -n my32bitbox -- --bindhome $LOGNAME -a i386 --release trusty
sudo lxc-start -n my32bitbox
# login as yourself
sudo sh -c "sed s/deb/deb-src/ /etc/apt/sources.list >> /etc/apt/sources.list"
sudo apt-get install devscripts
sudo apt-get build-dep wine1.7
apt-get source wine1.7
cd wine1.7-*
debuild -eDEB_BUILD_OPTIONS="parallel=8" -i -us -uc -b
shutdown -h now   # to exit the container

Here is the wiki page about how to build 32-bit wine on a 64-bit host using lxc.

How do I get a human-readable file size in bytes abbreviation using .NET?

Here's a concise answer that determines the unit automatically.

public static string ToBytesCount(this long bytes)
{
    int unit = 1024;
    string unitStr = "b";
    if (bytes < unit) return string.Format("{0} {1}", bytes, unitStr);
    else unitStr = unitStr.ToUpper();
    int exp = (int)(Math.Log(bytes) / Math.Log(unit));
    return string.Format("{0:##.##} {1}{2}", bytes / Math.Pow(unit, exp), "KMGTPEZY"[exp - 1], unitStr);
}

"b" is for bit, "B" is for Byte and "KMGTPEZY" are respectively for kilo, mega, giga, tera, peta, exa, zetta and yotta

One can expand it to take ISO/IEC80000 into account:

public static string ToBytesCount(this long bytes, bool isISO = true)
{
    int unit = 1024;
    string unitStr = "b";
    if (!isISO) unit = 1000;
    if (bytes < unit) return string.Format("{0} {1}", bytes, unitStr);
    else unitStr = unitStr.ToUpper();
    if (isISO) unitStr = "i" + unitStr;
    int exp = (int)(Math.Log(bytes) / Math.Log(unit));
    return string.Format("{0:##.##} {1}{2}", bytes / Math.Pow(unit, exp), "KMGTPEZY"[exp - 1], unitStr);
}

sql set variable using COUNT

You can use SELECT as lambacck said or add parentheses:

SET @times = (SELECT COUNT(DidWin)as "I Win"
FROM thetable
WHERE DidWin = 1 AND Playername='Me');

Create new user in MySQL and give it full access to one database

To me this worked.

CREATE USER 'spowner'@'localhost' IDENTIFIED BY '1234'; 
GRANT ALL PRIVILEGES ON test.* To 'spowner'@'localhost'; 
FLUSH PRIVILEGES;

where

  • spowner : user name
  • 1234 : password of spowner
  • test : database 'spowner' has access right to

Centering in CSS Grid

You can use flexbox to center your text. By the way no need for extra containers because text is considered as anonymous flex item.

From flexbox specs:

Each in-flow child of a flex container becomes a flex item, and each contiguous run of text that is directly contained inside a flex container is wrapped in an anonymous flex item. However, an anonymous flex item that contains only white space (i.e. characters that can be affected by the white-space property) is not rendered (just as if it were display:none).

So just make grid items as flex containers (display: flex), and add align-items: center and justify-content: center to center both vertically and horizontally.

Also performed optimization of HTML and CSS:

_x000D_
_x000D_
html,_x000D_
body {_x000D_
  margin: 0;_x000D_
  padding: 0;_x000D_
}_x000D_
_x000D_
.container {_x000D_
  display: grid;_x000D_
  grid-template-columns: 1fr 1fr;_x000D_
  grid-template-rows: 100vh;_x000D_
  _x000D_
  font-family: Raleway;_x000D_
  font-size: large;_x000D_
}_x000D_
_x000D_
.left_bg,_x000D_
.right_bg {_x000D_
  display: flex;_x000D_
  align-items: center;_x000D_
  justify-content: center;_x000D_
}_x000D_
_x000D_
.left_bg {_x000D_
  background-color: #3498db;_x000D_
}_x000D_
_x000D_
.right_bg {_x000D_
  background-color: #ecf0f1;_x000D_
}
_x000D_
<div class="container">_x000D_
  <div class="left_bg">Review my stuff</div>_x000D_
  <div class="right_bg">Hire me!</div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

How to create User/Database in script for Docker Postgres

You can now put .sql files inside the init directory:

From the docs

If you would like to do additional initialization in an image derived from this one, add one or more *.sql or *.sh scripts under /docker-entrypoint-initdb.d (creating the directory if necessary). After the entrypoint calls initdb to create the default postgres user and database, it will run any *.sql files and source any *.sh scripts found in that directory to do further initialization before starting the service.

So copying your .sql file in will work.

Split large string in n-size chunks in JavaScript

You can use reduce() without any regex:

(str, n) => {
  return str.split('').reduce(
    (acc, rec, index) => {
      return ((index % n) || !(index)) ? acc.concat(rec) : acc.concat(',', rec)
    },
    ''
  ).split(',')
}

How to register multiple implementations of the same interface in Asp.Net Core?

FooA, FooB and FooC implements IFoo

Services Provider:

services.AddTransient<FooA>(); // Note that there is no interface
services.AddTransient<FooB>();
services.AddTransient<FooC>();

services.AddSingleton<Func<Type, IFoo>>(x => type =>
{
    return (IFoo)x.GetService(type);
});

Destination:

public class Test
{
    private readonly IFoo foo;

    public Test(Func<Type, IFoo> fooFactory)
    {
        foo = fooFactory(typeof(FooA));
    }

    ....

}

If you want to change the FooA to FooAMock for test purposes:

services.AddTransient<FooAMock>();

services.AddSingleton<Func<Type, IFoo>>(x => type =>
{
    if(type.Equals(typeof(FooA))
        return (IFoo)x.GetService(typeof(FooAMock));
    return null;
});

Left align block of equations

You can use \begin{flalign}, like the example bellow:

\begin{flalign}
    &f(x) = -1.25x^{2} + 1.5x&
\end{flalign}

How to set the current working directory?

It work for Mac also

import os
path="/Users/HOME/Desktop/Addl Work/TimeSeries-Done"
os.chdir(path)

To check working directory

os.getcwd()

PDO support for multiple queries (PDO_MYSQL, PDO_MYSQLND)

Like thousands of people, I'm looking for this question:
Can run multiple queries simultaneously, and if there was one error, none would run I went to this page everywhere
But although the friends here gave good answers, these answers were not good for my problem
So I wrote a function that works well and has almost no problem with sql Injection.
It might be helpful for those who are looking for similar questions so I put them here to use

function arrayOfQuerys($arrayQuery)
{
    $mx = true;
    $conn->beginTransaction();
    try {
        foreach ($arrayQuery AS $item) {
            $stmt = $conn->prepare($item["query"]);
            $stmt->execute($item["params"]);
            $result = $stmt->rowCount();
            if($result == 0)
                $mx = false;
         }
         if($mx == true)
             $conn->commit();
         else
             $conn->rollBack();
    } catch (Exception $e) {
        $conn->rollBack();
        echo "Failed: " . $e->getMessage();
    }
    return $mx;
}

for use(example):

 $arrayQuery = Array(
    Array(
        "query" => "UPDATE test SET title = ? WHERE test.id = ?",
        "params" => Array("aa1", 1)
    ),
    Array(
        "query" => "UPDATE test SET title = ? WHERE test.id = ?",
        "params" => Array("bb1", 2)
    )
);
arrayOfQuerys($arrayQuery);

and my connection:

    try {
        $options = array(
            //For updates where newvalue = oldvalue PDOStatement::rowCount()   returns zero. You can use this:
            PDO::MYSQL_ATTR_FOUND_ROWS => true
        );
        $conn = new PDO("mysql:host=$servername;dbname=$database", $username, $password, $options);
        $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    } catch (PDOException $e) {
        echo "Error connecting to SQL Server: " . $e->getMessage();
    }

Note:
This solution helps you to run multiple statement together,
If an incorrect a statement occurs, it does not execute any other statement

How to change the bootstrap primary color?

Bootstrap 4

This is what worked for me:

I created my own _custom_theme.scss file with content similar to:

/* To simplify I'm only changing the primary color */
$theme-colors: ( "primary":#ffd800);

Added it to the top of the file bootstrap.scss and recompiled (In my case I had it in a folder called !scss)

@import "../../../!scss/_custom_theme.scss";
@import "functions";
@import "variables";
@import "mixins";

Full screen background image in an activity

There are several ways you can do it.

Option 1:

Create different perfect images for different dpi and place them in related drawable folder. Then set

android:background="@drawable/your_image"

Option 2:

Add a single large image. Use FrameLayout. As a first child add an ImageView. Set the following in your ImageView.

android:src="@drawable/your_image"
android:scaleType = "centerCrop"