How can I read the contents of an URL with Python?
A solution with works with Python 2.X and Python 3.X makes use of the Python 2 and 3 compatibility library six:
from six.moves.urllib.request import urlopen
link = "http://www.somesite.com/details.pl?urn=2344"
response = urlopen(link)
content = response.read()
print(content)
How to access a preexisting collection with Mongoose?
Go to MongoDB website, Login > Connect > Connect Application > Copy > Paste in 'database_url' > Collections > Copy/Paste in 'collection' .
var mongoose = require("mongoose");
mongoose.connect(' database_url ');
var conn = mongoose.connection;
conn.on('error', console.error.bind(console, 'connection error:'));
conn.once('open', function () {
conn.db.collection(" collection ", function(err, collection){
collection.find({}).toArray(function(err, data){
console.log(data); // data printed in console
})
});
});
Happy to Help. by RTTSS.
How to set a border for an HTML div tag
can use
border-width:2px;
border-style:solid;
border-color:black;
or as shorthand
border: 2px solid black
CSS – why doesn’t percentage height work?
The height of a block element defaults to the height of the block's content. So, given something like this:
<div id="outer">
<div id="inner">
<p>Where is pancakes house?</p>
</div>
</div>
#inner will grow to be tall enough to contain the paragraph and #outer will grow to be tall enough to contain #inner.
When you specify the height or width as a percentage, that's a percentage with respect to the element's parent. In the case of width, all block elements are, unless specified otherwise, as wide as their parent all the way back up to <html>; so, the width of a block element is independent of its content and saying width: 50% yields a well defined number of pixels.
However, the height of a block element depends on its content unless you specify a specific height. So there is feedback between the parent and child where height is concerned and saying height: 50% doesn't yield a well defined value unless you break the feedback loop by giving the parent element a specific height.
jQuery - simple input validation - "empty" and "not empty"
You could do this
$("#input").blur(function(){
if($(this).val() == ''){
alert('empty');
}
});
http://jsfiddle.net/jasongennaro/Y5P9k/1/
When the input has lost focus that is .blur(), then check the value of the #input.
If it is empty == '' then trigger the alert.
jQuery.click() vs onClick
$('#myDiv').click is better, because it separates JavaScript code from HTML. One must try to keep the page behaviour and structure different. This helps a lot.
Converting JSONarray to ArrayList
I've done it using Gson (by Google).
Add the following line to your module's build.gradle:
dependencies {
// ...
// Note that `compile` will be deprecated. Use `implementation` instead.
// See https://stackoverflow.com/a/44409111 for more info
implementation 'com.google.code.gson:gson:2.8.2'
}
JSON string:
private String jsonString = "[\n" +
" {\n" +
" \"id\": \"c200\",\n" +
" \"name\": \"Ravi Tamada\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c201\",\n" +
" \"name\": \"Johnny Depp\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c202\",\n" +
" \"name\": \"Leonardo Dicaprio\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c203\",\n" +
" \"name\": \"John Wayne\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c204\",\n" +
" \"name\": \"Angelina Jolie\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"female\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c205\",\n" +
" \"name\": \"Dido\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"female\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c206\",\n" +
" \"name\": \"Adele\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"female\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c207\",\n" +
" \"name\": \"Hugh Jackman\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c208\",\n" +
" \"name\": \"Will Smith\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c209\",\n" +
" \"name\": \"Clint Eastwood\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c2010\",\n" +
" \"name\": \"Barack Obama\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c2011\",\n" +
" \"name\": \"Kate Winslet\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"female\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c2012\",\n" +
" \"name\": \"Eminem\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" }\n" +
" ]";
ContactModel.java:
public class ContactModel {
public String id;
public String name;
public String email;
}
Code for converting a JSON string to ArrayList<Model>:
Note: You have to import java.lang.reflect.Type;:
// Top of file
import java.lang.reflect.Type;
// ...
private void parseJSON() {
Gson gson = new Gson();
Type type = new TypeToken<List<ContactModel>>(){}.getType();
List<ContactModel> contactList = gson.fromJson(jsonString, type);
for (ContactModel contact : contactList){
Log.i("Contact Details", contact.id + "-" + contact.name + "-" + contact.email);
}
}
Hope this will help you.
How to convert time milliseconds to hours, min, sec format in JavaScript?
Extending on @Rick's answer, I prefer something like this:
function msToReadableTime(time){
const second = 1000;
const minute = second * 60;
const hour = minute * 60;
let hours = Math.floor(time / hour % 24);
let minutes = Math.floor(time / minute % 60);
let seconds = Math.floor(time / second % 60);
return hours + ':' + minutes + ":" + seconds;
}
How to get the number of columns in a matrix?
While size(A,2) is correct, I find it's much more readable to first define
rows = @(x) size(x,1);
cols = @(x) size(x,2);
and then use, for example, like this:
howManyColumns_in_A = cols(A)
howManyRows_in_A = rows(A)
It might appear as a small saving, but size(.., 1) and size(.., 2) must be some of the most commonly used functions, and they are not optimally readable as-is.
How to update and delete a cookie?
http://www.quirksmode.org/js/cookies.html
function createCookie(name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}
else var expires = "";
document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}
function eraseCookie(name) {
createCookie(name,"",-1);
}
How to open PDF file in a new tab or window instead of downloading it (using asp.net)?
Response.ContentType = contentType;
HttpContext.Current.Response.AddHeader("Content-Disposition", "inline; filename=" + fileName);
Response.BinaryWrite(fileContent);
And
<asp:LinkButton OnClientClick="openInNewTab();" OnClick="CodeBehindMethod".../>
In javaScript:
<script type="text/javascript">
function openInNewTab() {
window.document.forms[0].target = '_blank';
setTimeout(function () { window.document.forms[0].target = ''; }, 0);
}
</script>
Take care to reset target, otherwise all other calls like Response.Redirect will open in a new tab, which might be not what you want.
How to make String.Contains case insensitive?
You can use:
if (myString1.IndexOf("AbC", StringComparison.OrdinalIgnoreCase) >=0) {
//...
}
This works with any .NET version.
gcloud command not found - while installing Google Cloud SDK
You have to add the command to the path
Run
brew info --cask google-cloud-sdk
and find the lines to append to ~/.zshrc
The lines to append can be obtained from the output of the previous command. For zsh users, It should be some like these:
export CLOUDSDK_PYTHON="/usr/local/opt/[email protected]/libexec/bin/python"
source "/usr/local/Caskroom/google-cloud-sdk/latest/google-cloud-sdk/path.zsh.inc"
source "/usr/local/Caskroom/google-cloud-sdk/latest/google-cloud-sdk/completion.zsh.inc"
(or choose the proper ones from the command output depending un the Shell you are using)
SmtpException: Unable to read data from the transport connection: net_io_connectionclosed
Prepare: 1. HostA is SMTP virtual server with default port 25 2. HostB is a workstation on which I send mail with SmtpClient and simulate unstable network I use clumsy
Case 1 Given If HostB is 2008R2 When I send email. Then This issue occurs.
Case 2 Given If HostB is 2012 or higher version When I send email. Then The mail was sent out.
Conclusion: This root cause is related with Windows Server 2008R2.
Are string.Equals() and == operator really same?
It is clear that tvi.header is not a String. The == is an operator that is overloaded by String class, which means it will be working only if compiler knows that both side of the operator are String.
Error: invalid operands of types ‘const char [35]’ and ‘const char [2]’ to binary ‘operator+’
In this particular case, an even simpler fix would be to just get rid of the "+" all together because AGE is a string literal and what comes before and after are also string literals. You could write line 3 as:
str += "Do you feel " AGE " years old?";
This is because most C/C++ compilers will concatenate string literals automatically. The above is equivalent to:
str += "Do you feel " "42" " years old?";
which the compiler will convert to:
str += "Do you feel 42 years old?";
What is the best way to get the first letter from a string in Java, returned as a string of length 1?
String whole = "something";
String first = whole.substring(0, 1);
System.out.println(first);
How to get datetime in JavaScript?
try this:
var today = new Date();
var date = today.getFullYear()+'-'+(today.getMonth()+1)+'-'+today.getDate();
var time = today.getHours()+':'+today.getMinutes()+':'+today.getSeconds();
console.log(date + ' '+ time);Create an application setup in visual studio 2013
Visual Studio 2013 now supports setup projects. Microsoft have shipped a Visual Studio extension to produce setup projects.
Get checkbox value in jQuery
The best way of retrieving a checkbox's value is as following
if ( elem.checked )
if ( $( elem ).prop( "checked" ) )
if ( $( elem ).is( ":checked" ) )
as explained in the official documentations in jQuery's website. The rest of the methods has nothing to do with the property of the checkbox, they are checking the attribute which means they are testing the initial state of the checkbox when it was loaded. So in short:
- When you have the element and you know it is a checkbox you can simply read its property and you won't need jQuery for that (i.e.
elem.checked) or you can use$(elem).prop("checked")if you want to rely on jQuery. - If you need to know (or compare) the value when the element was first loaded (i.e. the default value) the correct way to do it is
elem.getAttribute("checked")orelem.prop("defaultChecked").
Please note that elem.attr("checked") is modified only after version 1.6.1+ of jQuery to return the same result as elem.prop("checked").
Some answers are misleading or imprecise, Please check below yourself:
How to unzip a file in Powershell?
For those, who want to use Shell.Application.Namespace.Folder.CopyHere() and want to hide progress bars while copying, or use more options, the documentation is here:
https://docs.microsoft.com/en-us/windows/desktop/shell/folder-copyhere
To use powershell and hide progress bars and disable confirmations you can use code like this:
# We should create folder before using it for shell operations as it is required
New-Item -ItemType directory -Path "C:\destinationDir" -Force
$shell = New-Object -ComObject Shell.Application
$zip = $shell.Namespace("C:\archive.zip")
$items = $zip.items()
$shell.Namespace("C:\destinationDir").CopyHere($items, 1556)
Limitations of use of Shell.Application on windows core versions:
https://docs.microsoft.com/en-us/windows-server/administration/server-core/what-is-server-core
On windows core versions, by default the Microsoft-Windows-Server-Shell-Package is not installed, so shell.applicaton will not work.
note: Extracting archives this way will take a long time and can slow down windows gui
How to remove an element from the flow?
One trick that makes position:absolute more palatable to me is to make its parent position:relative. Then the child will be 'absolute' relative to the position of the parent.
How can I change the size of a Bootstrap checkbox?
It is possible in css, but not for all the browsers.
The effect on all browsers:
http://www.456bereastreet.com/lab/form_controls/checkboxes/
A possibility is a custom checkbox with javascript:
http://ryanfait.com/resources/custom-checkboxes-and-radio-buttons/
What is the difference between T(n) and O(n)?
A chart could make the previous answers easier to understand:
T-Notation - Same order | O-Notation - Upper bound
In English,
On the left, note that there is an upper bound and a lower bound that are both of the same order of magnitude (i.e. g(n) ). Ignore the constants, and if the upper bound and lower bound have the same order of magnitude, one can validly say f(n) = T(g(n)) or f(n) is in big theta of g(n).
Starting with the right, the simpler example, it is saying the upper bound g(n) is simply the order of magnitude and ignores the constant c (just as all big O notation does).
Compare dates in MySQL
This works for me:
select date_format(date(starttime),'%Y-%m-%d') from data
where date(starttime) >= date '2012-11-02';
Note the format string '%Y-%m-%d' and the format of the input date.
How can I parse a YAML file in Python
The easiest and purest method without relying on C headers is PyYaml (documentation), which can be installed via pip install pyyaml:
#!/usr/bin/env python
import yaml
with open("example.yaml", 'r') as stream:
try:
print(yaml.safe_load(stream))
except yaml.YAMLError as exc:
print(exc)
And that's it. A plain yaml.load() function also exists, but yaml.safe_load() should always be preferred unless you explicitly need the arbitrary object serialization/deserialization provided in order to avoid introducing the possibility for arbitrary code execution.
Note the PyYaml project supports versions up through the YAML 1.1 specification. If YAML 1.2 specification support is needed, see ruamel.yaml as noted in this answer.
What is MATLAB good for? Why is it so used by universities? When is it better than Python?
The main reason it is useful in industry is the plug-ins built on top of the core functionality. Almost all active Matlab development for the last few years has focused on these.
Unfortunately, you won't have much opportunity to use these in an academic environment.
How do I search for a pattern within a text file using Python combining regex & string/file operations and store instances of the pattern?
import re
pattern = re.compile("<(\d{4,5})>")
for i, line in enumerate(open('test.txt')):
for match in re.finditer(pattern, line):
print 'Found on line %s: %s' % (i+1, match.group())
A couple of notes about the regex:
- You don't need the
?at the end and the outer(...)if you don't want to match the number with the angle brackets, but only want the number itself - It matches either 4 or 5 digits between the angle brackets
Update: It's important to understand that the match and capture in a regex can be quite different. The regex in my snippet above matches the pattern with angle brackets, but I ask to capture only the internal number, without the angle brackets.
More about regex in python can be found here : Regular Expression HOWTO
SQL Logic Operator Precedence: And and Or
I'll add 2 points:
- "IN" is effectively serial ORs with parentheses around them
- AND has precedence over OR in every language I know
So, the 2 expressions are simply not equal.
WHERE some_col in (1,2,3,4,5) AND some_other_expr
--to the optimiser is this
WHERE
(
some_col = 1 OR
some_col = 2 OR
some_col = 3 OR
some_col = 4 OR
some_col = 5
)
AND
some_other_expr
So, when you break the IN clause up, you split the serial ORs up, and changed precedence.
Really killing a process in Windows
"End Process" on the Processes-Tab calls TerminateProcess which is the most ultimate way Windows knows to kill a process.
If it doesn't go away, it's currently locked waiting on some kernel resource (probably a buggy driver) and there is nothing (short of a reboot) you could do to make the process go away.
Have a look at this blog-entry from wayback when: http://blogs.technet.com/markrussinovich/archive/2005/08/17/unkillable-processes.aspx
Unix based systems like Linux also have that problem where processes could survive a kill -9 if they are in what's known as "Uninterruptible sleep" (shown by top and ps as state D) at which point the processes sleep so well that they can't process incoming signals (which is what kill does - sending signals).
Normally, Uninterruptible sleep should not last long, but as under Windows, broken drivers or broken userpace programs (vfork without exec) can end up sleeping in D forever.
Ruby: How to turn a hash into HTTP parameters?
require 'uri'
class Hash
def to_query_hash(key)
reduce({}) do |h, (k, v)|
new_key = key.nil? ? k : "#{key}[#{k}]"
v = Hash[v.each_with_index.to_a.map(&:reverse)] if v.is_a?(Array)
if v.is_a?(Hash)
h.merge!(v.to_query_hash(new_key))
else
h[new_key] = v
end
h
end
end
def to_query(key = nil)
URI.encode_www_form(to_query_hash(key))
end
end
2.4.2 :019 > {:a => "a", :b => "b"}.to_query_hash(nil)
=> {:a=>"a", :b=>"b"}
2.4.2 :020 > {:a => "a", :b => "b"}.to_query
=> "a=a&b=b"
2.4.2 :021 > {:a => "a", :b => ["c", "d", "e"]}.to_query_hash(nil)
=> {:a=>"a", "b[0]"=>"c", "b[1]"=>"d", "b[2]"=>"e"}
2.4.2 :022 > {:a => "a", :b => ["c", "d", "e"]}.to_query
=> "a=a&b%5B0%5D=c&b%5B1%5D=d&b%5B2%5D=e"
How best to determine if an argument is not sent to the JavaScript function
function example(arg) {
var argumentID = '0'; //1,2,3,4...whatever
if (argumentID in arguments === false) {
console.log(`the argument with id ${argumentID} was not passed to the function`);
}
}
Because arrays inherit from Object.prototype. Consider ? to make the world better.
How to set up tmux so that it starts up with specified windows opened?
If you just want to split screen on 2 panes (say horizontally), you can run this command (no tmux or shell scripts required):
tmux new-session \; split-window -h \;
You screen will look like this:
[ks@localhost ~]$ ¦[ks@localhost ~]$
¦
¦
¦
¦
¦
¦
¦
¦
¦
¦
¦
[10] 0:ks@localhost:~* "localhost.localdomain" 19:51 31-???-16
How to use variables in a command in sed?
This might work for you:
sed 's|$ROOT|'"${HOME}"'|g' abc.sh > abc.sh.1
Markdown to create pages and table of contents?
Use toc.py which is a tiny python script which generates a table-of-contents for your markdown.
Usage:
- In your Markdown file add
<toc>where you want the table of contents to be placed. $python toc.py README.md(Use your markdown filename instead of README.md)
Cheers!
Including dependencies in a jar with Maven
http://fiji.sc/Uber-JAR provides an excellent explanation of the alternatives:
There are three common methods for constructing an uber-JAR:
- Unshaded. Unpack all JAR files, then repack them into a single JAR.
- Pro: Works with Java's default class loader.
- Con: Files present in multiple JAR files with the same path (e.g., META-INF/services/javax.script.ScriptEngineFactory) will overwrite one another, resulting in faulty behavior.
- Tools: Maven Assembly Plugin, Classworlds Uberjar
- Shaded. Same as unshaded, but rename (i.e., "shade") all packages of all dependencies.
- Pro: Works with Java's default class loader. Avoids some (not all) dependency version clashes.
- Con: Files present in multiple JAR files with the same path (e.g., META-INF/services/javax.script.ScriptEngineFactory) will overwrite one another, resulting in faulty behavior.
- Tools: Maven Shade Plugin
- JAR of JARs. The final JAR file contains the other JAR files embedded within.
- Pro: Avoids dependency version clashes. All resource files are preserved.
- Con: Needs to bundle a special "bootstrap" classloader to enable Java to load classes from the wrapped JAR files. Debugging class loader issues becomes more complex.
- Tools: Eclipse JAR File Exporter, One-JAR.
Show values from a MySQL database table inside a HTML table on a webpage
Example taken from W3Schools: PHP Select Data from MySQL
<?php
$con=mysqli_connect("example.com","peter","abc123","my_db");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$result = mysqli_query($con,"SELECT * FROM Persons");
echo "<table border='1'>
<tr>
<th>Firstname</th>
<th>Lastname</th>
</tr>";
while($row = mysqli_fetch_array($result))
{
echo "<tr>";
echo "<td>" . $row['FirstName'] . "</td>";
echo "<td>" . $row['LastName'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysqli_close($con);
?>
It's a good place to learn from!
C# generic list <T> how to get the type of T?
Type type = pi.PropertyType;
if(type.IsGenericType && type.GetGenericTypeDefinition()
== typeof(List<>))
{
Type itemType = type.GetGenericArguments()[0]; // use this...
}
More generally, to support any IList<T>, you need to check the interfaces:
foreach (Type interfaceType in type.GetInterfaces())
{
if (interfaceType.IsGenericType &&
interfaceType.GetGenericTypeDefinition()
== typeof(IList<>))
{
Type itemType = type.GetGenericArguments()[0];
// do something...
break;
}
}
Preprocessing in scikit learn - single sample - Depreciation warning
This might help
temp = ([[1,2,3,4,5,6,.....,7]])
How do you get the list of targets in a makefile?
For AWK haters, and for simplicity, this contraption works for me:
help:
make -qpRr $(lastword $(MAKEFILE_LIST)) | egrep -v '(^(\.|:|#|\s|$)|=)' | cut -d: -f1
(for use outside a Makefile, just remove $(lastword ...) or replace it with the Makefile path).
This solution will not work if you have "interesting" rule names but will work well for most simple setups. The main downside of a make -qp based solution is (as in other answers here) that if the Makefile defines variable values using functions - they will still be executed regardless of -q, and if using $(shell ...) then the shell command will still be called and its side effects will happen. In my setup often the side effects of running shell functions is unwanted output to standard error, so I add 2>/dev/null after the make command.
Break or return from Java 8 stream forEach?
What about this one:
final BooleanWrapper condition = new BooleanWrapper();
someObjects.forEach(obj -> {
if (condition.ok()) {
// YOUR CODE to control
condition.stop();
}
});
Where BooleanWrapper is a class you must implement to control the flow.
Can anyone explain me StandardScaler?
The idea behind StandardScaler is that it will transform your data such that its distribution will have a mean value 0 and standard deviation of 1.
In case of multivariate data, this is done feature-wise (in other words independently for each column of the data).
Given the distribution of the data, each value in the dataset will have the mean value subtracted, and then divided by the standard deviation of the whole dataset (or feature in the multivariate case).
SDK Location not found Android Studio + Gradle
I found the solution here:
http://xinyustudio.wordpress.com/2014/07/02/gradle-sdk-location-not-found-the-problem-and-solution/
Just create a file local.properties and add a line with sdk.dir=SDK_LOCATION
_tkinter.TclError: no display name and no $DISPLAY environment variable
I want to add an answer here that noone has explicitly stated with implementation.
This is a great resource to refer to for this failure: https://matplotlib.org/faq/usage_faq.html
In my case, using matplotlib.use did not work because it was somehow already set somewhere else. However, I was able to get beyond the error by defining an environment variable:
export MPLBACKEND=Agg
This takes care of the issue.
My error was in a CircleCI flow specifically, and this resolved the failing tests. One wierd thing was, my tests would pass when run using pytest, however would fail when using parallelism along with circleci tests split feature. However, declaring this env variable resolved the issue.
Removing duplicate objects with Underscore for Javascript
If you're looking to remove duplicates based on an id you could do something like this:
var res = [
{id: 1, content: 'heeey'},
{id: 2, content: 'woah'},
{id: 1, content:'foo'},
{id: 1, content: 'heeey'},
];
var uniques = _.map(_.groupBy(res,function(doc){
return doc.id;
}),function(grouped){
return grouped[0];
});
//uniques
//[{id: 1, content: 'heeey'},{id: 2, content: 'woah'}]
How do I define a method in Razor?
Leaving alone any debates over when (if ever) it should be done, @functions is how you do it.
@functions {
// Add code here.
}
RecyclerView onClick
you can easily define setOnClickListener in your ViewHolder class as follow :
public class ViewHolder extends RecyclerView.ViewHolder {
TextView product_name;
ViewHolder(View itemView) {
super(itemView);
product_name = (TextView) itemView.findViewById(R.id.product_name);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int itemPosition = getLayoutPosition();
Toast.makeText(getApplicationContext(), itemPosition + ":" + String.valueOf(product_name.getText()), Toast.LENGTH_SHORT).show();
}
});
}
}
How to add 10 minutes to my (String) time?
Use Calendar.add(int field,int amount) method.
How do I copy SQL Azure database to my local development server?
In SQL Server Management Studio
Right click on the database you want to import, click Tasks > Export data-tier application, and export your database to a local .dacpac file.
In your local target SQL server instance, you can right click Databases > Import data-tier application, and once it's local, you can do things like backup and restore the database.
How to write a switch statement in Ruby
Depending on your case, you could prefer to use a hash of methods.
If there is a long list of whens and each of them has a concrete value to compare with (not an interval), it will be more effective to declare a hash of methods and then to call the relevant method from the hash like that.
# Define the hash
menu = {a: :menu1, b: :menu2, c: :menu2, d: :menu3}
# Define the methods
def menu1
puts 'menu 1'
end
def menu2
puts 'menu 2'
end
def menu3
puts 'menu3'
end
# Let's say we case by selected_menu = :a
selected_menu = :a
# Then just call the relevant method from the hash
send(menu[selected_menu])
Python JSON encoding
Try:
import simplejson
data = {'apple': 'cat', 'banana':'dog', 'pear':'fish'}
data_json = "{'apple': 'cat', 'banana':'dog', 'pear':'fish'}"
simplejson.loads(data_json) # outputs data
simplejson.dumps(data) # outputs data_joon
NB: Based on Paolo's answer.
How to check for valid email address?
This is typically solved using regex. There are many variations of solutions however. Depending on how strict you need to be, and if you have custom requirements for validation, or will accept any valid email address.
See this page for reference: http://www.regular-expressions.info/email.html
"Unicode Error "unicodeescape" codec can't decode bytes... Cannot open text files in Python 3
Typical error on Windows because the default user directory is C:\user\<your_user>, so when you want to use this path as an string parameter into a Python function, you get a Unicode error, just because the \u is a Unicode escape. Any character not numeric after this produces an error.
To solve it, just double the backslashes: C:\\user\\<\your_user>...
What is best way to start and stop hadoop ecosystem, with command line?
start-all.sh & stop-all.sh : Used to start and stop hadoop daemons all at once. Issuing it on the master machine will start/stop the daemons on all the nodes of a cluster. Deprecated as you have already noticed.
start-dfs.sh, stop-dfs.sh and start-yarn.sh, stop-yarn.sh : Same as above but start/stop HDFS and YARN daemons separately on all the nodes from the master machine. It is advisable to use these commands now over start-all.sh & stop-all.sh
hadoop-daemon.sh namenode/datanode and yarn-deamon.sh resourcemanager : To start individual daemons on an individual machine manually. You need to go to a particular node and issue these commands.
Use case : Suppose you have added a new DN to your cluster and you need to start the DN daemon only on this machine,
bin/hadoop-daemon.sh start datanode
Note : You should have ssh enabled if you want to start all the daemons on all the nodes from one machine.
Hope this answers your query.
Swapping two variable value without using third variable
Of course, the C++ answer should be std::swap.
However, there is also no third variable in the following implementation of swap:
template <typename T>
void swap (T &a, T &b) {
std::pair<T &, T &>(a, b) = std::make_pair(b, a);
}
Or, as a one-liner:
std::make_pair(std::ref(a), std::ref(b)) = std::make_pair(b, a);
Two inline-block, width 50% elements wrap to second line
You can remove the whitespaces via css using white-space so you can keep your pretty HTML layout. Don't forget to set the white-space back to normal again if you want your text to wrap inside the columns.
Tested in IE9, Chrome 18, FF 12
.container { white-space: nowrap; }
.column { display: inline-block; width: 50%; white-space: normal; }
<div class="container">
<div class="column">text that can wrap</div>
<div class="column">text that can wrap</div>
</div>
Throwing multiple exceptions in a method of an interface in java
You can declare as many Exceptions as you want for your interface method. But the class you gave in your question is invalid. It should read
public class MyClass implements MyInterface {
public void find(int x) throws A_Exception, B_Exception{
----
----
---
}
}
Then an interface would look like this
public interface MyInterface {
void find(int x) throws A_Exception, B_Exception;
}
Type safety: Unchecked cast
If you really want to get rid of the warnings, one thing you can do is create a class that extends from the generic class.
For example, if you're trying to use
private Map<String, String> someMap = new HashMap<String, String>();
You can create a new class like such
public class StringMap extends HashMap<String, String>()
{
// Override constructors
}
Then when you use
someMap = (StringMap) getApplicationContext().getBean("someMap");
The compiler DOES know what the (no longer generic) types are, and there will be no warning. This may not always be the perfect solution, some might argue this kind of defeats the purpose of generic classes, but you're still re-using all of the same code from the generic class, you're just declaring at compile time what type you want to use.
Make an image follow mouse pointer
Here's my code (not optimized but a full working example):
<head>
<style>
#divtoshow {position:absolute;display:none;color:white;background-color:black}
#onme {width:150px;height:80px;background-color:yellow;cursor:pointer}
</style>
<script type="text/javascript">
var divName = 'divtoshow'; // div that is to follow the mouse (must be position:absolute)
var offX = 15; // X offset from mouse position
var offY = 15; // Y offset from mouse position
function mouseX(evt) {if (!evt) evt = window.event; if (evt.pageX) return evt.pageX; else if (evt.clientX)return evt.clientX + (document.documentElement.scrollLeft ? document.documentElement.scrollLeft : document.body.scrollLeft); else return 0;}
function mouseY(evt) {if (!evt) evt = window.event; if (evt.pageY) return evt.pageY; else if (evt.clientY)return evt.clientY + (document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop); else return 0;}
function follow(evt) {
var obj = document.getElementById(divName).style;
obj.left = (parseInt(mouseX(evt))+offX) + 'px';
obj.top = (parseInt(mouseY(evt))+offY) + 'px';
}
document.onmousemove = follow;
</script>
</head>
<body>
<div id="divtoshow">test</div>
<br><br>
<div id='onme' onMouseover='document.getElementById(divName).style.display="block"' onMouseout='document.getElementById(divName).style.display="none"'>Mouse over this</div>
</body>
How to Save Console.WriteLine Output to Text File
Try if this works:
FileStream filestream = new FileStream("out.txt", FileMode.Create);
var streamwriter = new StreamWriter(filestream);
streamwriter.AutoFlush = true;
Console.SetOut(streamwriter);
Console.SetError(streamwriter);
JQuery Validate Dropdown list
As we know jQuery validate plugin invalidates Select field when it has blank value. Why don't we set its value to blank when required.
Yes, you can validate select field with some predefined value.
$("#everything").validate({
rules: {
select_field:{
required: {
depends: function(element){
if('none' == $('#select_field').val()){
//Set predefined value to blank.
$('#select_field').val('');
}
return true;
}
}
}
}
});
We can set blank value for select field but in some case we can't. For Ex: using a function that generates Dropdown field for you and you don't have control over it.
I hope it helps as it helps me.
Rename multiple files in cmd
Step 1:
Select all files (ctrl + A)
Step 2 :
Then choose rename option
Step 3:
Choose your filename... for ex: myfile
it automatically rename to myfile (01),myfile (02),,.....
If you want to replace spaces & bracket.. continue step 4
Step 4:
Open Windows Powershell from your current folder
Step 5:
For replace empty space to underscore (_)
dir | rename-item -NewName {$_.name -replace [Regex]::Escape(" "),"_"}
Step 6:
For replace open bracket
dir | rename-item -NewName {$_.name -replace [Regex]::Escape("("),""}
For replace close bracket
dir | rename-item -NewName {$_.name -replace [Regex]::Escape(")"),""}
Injection of autowired dependencies failed;
Do you have a bean declared in your context file that has an id of "articleService"? I believe that autowiring matches the id of a bean in your context files with the variable name that you are attempting to Autowire.
Best way to do a split pane in HTML
A good library is Shield UI - you can take a look at their flexible Splitter widget and the rest of the powerful components the framework offers.
Why don’t my SVG images scale using the CSS "width" property?
The transform CSS property lets you rotate, scale, skew, or translate an element.
So you can easily use the transform: scale(2.5); option to scale 2.5 times for example.
CKEditor, Image Upload (filebrowserUploadUrl)
My latest issue was how to integrate CKFinder for image upload in CKEditor. Here the solution.
Download CKEditor and extract in your web folder root.
Download CKFinder and extract withing ckeditor folder.
Then add references to the CKEditor, CKFinder and put
<CKEditor:CKEditorControl ID="CKEditorControl1" runat="server"></CKEditor:CKEditorControl>to your aspx page.
In code behind page OnLoad event add this code snippet
protected override void OnLoad(EventArgs e) { CKFinder.FileBrowser _FileBrowser = new CKFinder.FileBrowser(); _FileBrowser.BasePath = "ckeditor/ckfinder/"; _FileBrowser.SetupCKEditor(CKEditorControl1); }Edit Confic.ascx file.
public override bool CheckAuthentication() { return true; } // Perform additional checks for image files. SecureImageUploads = true;
(source)
UIButton Image + Text IOS
I think you are looking for this solution for your problem:
UIButton *_button = [UIButton buttonWithType:UIButtonTypeCustom];
[_button setFrame:CGRectMake(0.f, 0.f, 128.f, 128.f)]; // SET the values for your wishes
[_button setCenter:CGPointMake(128.f, 128.f)]; // SET the values for your wishes
[_button setClipsToBounds:false];
[_button setBackgroundImage:[UIImage imageNamed:@"jquery-mobile-icon.png"] forState:UIControlStateNormal]; // SET the image name for your wishes
[_button setTitle:@"Button" forState:UIControlStateNormal];
[_button.titleLabel setFont:[UIFont systemFontOfSize:24.f]];
[_button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; // SET the colour for your wishes
[_button setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted]; // SET the colour for your wishes
[_button setTitleEdgeInsets:UIEdgeInsetsMake(0.f, 0.f, -110.f, 0.f)]; // SET the values for your wishes
[_button addTarget:self action:@selector(buttonTouchedUpInside:) forControlEvents:UIControlEventTouchUpInside]; // you can ADD the action to the button as well like
...the rest of the customisation of the button is your duty now, and don't forget to add the button to your view.
UPDATE #1 and UPDATE #2
or, if you don't need a dynamic button you could add your button to your view in the Interface Builder and you could set the same values at there as well. it is pretty same, but here is this version as well in one simple picture.
you can also see the final result in the Interface Builder as it is on the screenshot.
How to run php files on my computer
You have to run a web server (e.g. Apache) and browse to your localhost, mostly likely on port 80.
What you really ought to do is install an all-in-one package like XAMPP, it bundles Apache, MySQL PHP, and Perl (if you were so inclined) as well as a few other tools that work with Apache and MySQL - plus it's cross platform (that's what the 'X' in 'XAMPP' stands for).
Once you install XAMPP (and there is an installer, so it shouldn't be hard) open up the control panel for XAMPP and then click the "Start" button next to Apache - note that on applications that require a database, you'll also need to start MySQL (and you'll be able to interface with it through phpMyAdmin). Once you've started Apache, you can browse to http://localhost.
Again, regardless of whether or not you choose XAMPP (which I would recommend), you should just have to start Apache.
Catching multiple exception types in one catch block
As an extension to the accepted answer, you could switch the type of Exception resulting in a pattern that is somewhat like the original example:
try {
// Try something
} catch (Exception $e) {
switch (get_class($e)) {
case 'AError':
case 'BError':
// Handle A or B
break;
case 'CError':
// Handle C
break;
case default:
// Rethrow the Exception
throw $e;
}
}
Python webbrowser.open() to open Chrome browser
if sys.platform[:3] == "win":
# First try to use the default Windows browser
register("windows-default", WindowsDefault)
# Detect some common Windows browsers, fallback to IE
iexplore = os.path.join(os.environ.get("PROGRAMFILES", "C:\\Program Files"),
"Mozilla Firefox\\FIREFOX.EXE")
for browser in ("firefox", "firebird", "seamonkey", "mozilla",
"netscape", "opera", iexplore):
if shutil.which(browser):
register(browser, None, BackgroundBrowser(browser))
100% Work....See line number 535-545..Change the path of iexplore to firefox or Chrome According to your requirement... in my case change path I Mention in the above code for firefox setting......
Twitter Bootstrap dropdown menu
I had a similar problem and it was the version of bootstrap.js included in my visual studio project. I linked to here and it worked great
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
How to update cursor limit for ORA-01000: maximum open cursors exceed
Assuming that you are using a spfile to start the database
alter system set open_cursors = 1000 scope=both;
If you are using a pfile instead, you can change the setting for the running instance
alter system set open_cursors = 1000
You would also then need to edit the parameter file to specify the new open_cursors setting. It would generally be a good idea to restart the database shortly thereafter to make sure that the parameter file change works as expected (it's highly annoying to discover months later the next time that you reboot the database that some parameter file change than no one remembers wasn't done correctly).
I'm also hoping that you are certain that you actually need more than 300 open cursors per session. A large fraction of the time, people that are adjusting this setting actually have a cursor leak and they are simply trying to paper over the bug rather than addressing the root cause.
Creating Scheduled Tasks
You can use Task Scheduler Managed Wrapper:
using System;
using Microsoft.Win32.TaskScheduler;
class Program
{
static void Main(string[] args)
{
// Get the service on the local machine
using (TaskService ts = new TaskService())
{
// Create a new task definition and assign properties
TaskDefinition td = ts.NewTask();
td.RegistrationInfo.Description = "Does something";
// Create a trigger that will fire the task at this time every other day
td.Triggers.Add(new DailyTrigger { DaysInterval = 2 });
// Create an action that will launch Notepad whenever the trigger fires
td.Actions.Add(new ExecAction("notepad.exe", "c:\\test.log", null));
// Register the task in the root folder
ts.RootFolder.RegisterTaskDefinition(@"Test", td);
// Remove the task we just created
ts.RootFolder.DeleteTask("Test");
}
}
}
Alternatively you can use native API or go for Quartz.NET. See this for details.
Stop and Start a service via batch or cmd file?
net start [serviceName]
and
net stop [serviceName]
tell you whether they have succeeded or failed pretty clearly. For example
U:\>net stop alerter
The Alerter service is not started.
More help is available by typing NET HELPMSG 3521.
If running from a batch file, you have access to the ERRORLEVEL of the return code. 0 indicates success. Anything higher indicates failure.
As a bat file, error.bat:
@echo off
net stop alerter
if ERRORLEVEL 1 goto error
exit
:error
echo There was a problem
pause
The output looks like this:
U:\>error.bat
The Alerter service is not started.
More help is available by typing NET HELPMSG 3521.
There was a problem
Press any key to continue . . .
Return Codes
- 0 = Success
- 1 = Not Supported
- 2 = Access Denied
- 3 = Dependent Services Running
- 4 = Invalid Service Control
- 5 = Service Cannot Accept Control
- 6 = Service Not Active
- 7 = Service Request Timeout
- 8 = Unknown Failure
- 9 = Path Not Found
- 10 = Service Already Running
- 11 = Service Database Locked
- 12 = Service Dependency Deleted
- 13 = Service Dependency Failure
- 14 = Service Disabled
- 15 = Service Logon Failure
- 16 = Service Marked For Deletion
- 17 = Service No Thread
- 18 = Status Circular Dependency
- 19 = Status Duplicate Name
- 20 = Status Invalid Name
- 21 = Status Invalid Parameter
- 22 = Status Invalid Service Account
- 23 = Status Service Exists
- 24 = Service Already Paused
Edit 20.04.2015
Return Codes:
The NET command does not return the documented Win32_Service class return codes (Service Not Active,Service Request Timeout, etc) and for many errors will simply return Errorlevel 2.
Look here: http://ss64.com/nt/net_service.html
An exception of type 'System.NullReferenceException' occurred in myproject.DLL but was not handled in user code
It means somewhere in your chain of calls, you tried to access a Property or call a method on an object that was null.
Given your statement:
img1.ImageUrl = ConfigurationManager
.AppSettings
.Get("Url")
.Replace("###", randomString)
+ Server.UrlEncode(
((System.Web.UI.MobileControls.Form)Page
.FindControl("mobileForm"))
.Title);
I'm guessing either the call to AppSettings.Get("Url") is returning null because the value isn't found or the call to Page.FindControl("mobileForm") is returning null because the control isn't found.
You could easily break this out into multiple statements to solve the problem:
var configUrl = ConfigurationManager.AppSettings.Get("Url");
var mobileFormControl = Page.FindControl("mobileForm")
as System.Web.UI.MobileControls.Form;
if(configUrl != null && mobileFormControl != null)
{
img1.ImageUrl = configUrl.Replace("###", randomString) + mobileControl.Title;
}
How to fix Error: this class is not key value coding-compliant for the key tableView.'
Any chance that you changed the name of your table view from "tableView" to "myTableView" at some point?
When do Java generics require <? extends T> instead of <T> and is there any downside of switching?
what if you use
Map<String, ? extends Class<? extends Serializable>> expected = null;
Checking version of angular-cli that's installed?
ng version or ng --version or ng v OR ng -v
You can use this 4 commands to check the which version of angular-cli installed in your machine.
How to close the command line window after running a batch file?
For closing cmd window, especially after ending weblogic or JBOSS app servers console with Ctrl+C, I'm using 'call' command instead of 'start' in my batch files. My startWLS.cmd file then looks like:
call [BEA_HOME]\user_projects\domains\test_domain\startWebLogic.cmd
After Ctrl+C(and 'Y' answer) cmd window is automatically closed.
How to create a directive with a dynamic template in AngularJS?
Had a similar need. $compile does the job. (Not completely sure if this is "THE" way to do it, still working my way through angular)
http://jsbin.com/ebuhuv/7/edit - my exploration test.
One thing to note (per my example), one of my requirements was that the template would change based on a type attribute once you clicked save, and the templates were very different. So though, you get the data binding, if need a new template in there, you will have to recompile.
How to dynamically load a Python class
Here is to share something I found on __import__ and importlib while trying to solve this problem.
I am using Python 3.7.3.
When I try to get to the class d in module a.b.c,
mod = __import__('a.b.c')
The mod variable refer to the top namespace a.
So to get to the class d, I need to
mod = getattr(mod, 'b') #mod is now module b
mod = getattr(mod, 'c') #mod is now module c
mod = getattr(mod, 'd') #mod is now class d
If we try to do
mod = __import__('a.b.c')
d = getattr(mod, 'd')
we are actually trying to look for a.d.
When using importlib, I suppose the library has done the recursive getattr for us. So, when we use importlib.import_module, we actually get a handle on the deepest module.
mod = importlib.import_module('a.b.c') #mod is module c
d = getattr(mod, 'd') #this is a.b.c.d
What is the single most influential book every programmer should read?
Mr. Bunny's Guide To ActiveX
jQuery changing font family and font size
Full working solution :
HTML:
<form id="myform">
<button>erase</button>
<select id="fs">
<option value="Arial">Arial</option>
<option value="Verdana ">Verdana </option>
<option value="Impact ">Impact </option>
<option value="Comic Sans MS">Comic Sans MS</option>
</select>
<select id="size">
<option value="7">7</option>
<option value="10">10</option>
<option value="20">20</option>
<option value="30">30</option>
</select>
</form>
<br/>
<textarea class="changeMe">Text into textarea</textarea>
<div id="container" class="changeMe">
<div id="float">
<p>
Text into container
</p>
</div>
</div>
jQuery:
$("#fs").change(function() {
//alert($(this).val());
$('.changeMe').css("font-family", $(this).val());
});
$("#size").change(function() {
$('.changeMe').css("font-size", $(this).val() + "px");
});
Fiddle here: http://jsfiddle.net/AaT9b/
Laravel update model with unique validation rule for attribute
If you have another column which is being used as foreign key or index then you have to specify that as well in the rule like this.
'phone' => [
"required",
"phone",
Rule::unique('shops')->ignore($shopId, 'id')->where(function ($query) {
$query->where('user_id', Auth::id());
}),
],
How do I parse a string to a float or int?
float(x) if '.' in x else int(x)
Best way to get application folder path
If you know to get the root directory:
string rootPath = Path.GetPathRoot(Application.StartupPath)
$_POST vs. $_SERVER['REQUEST_METHOD'] == 'POST'
It checks whether the page has been called through POST (as opposed to GET, HEAD, etc). When you type a URL in the menu bar, the page is called through GET. However, when you submit a form with method="post" the action page is called with POST.
Convert Year/Month/Day to Day of Year in Python
I want to present performance of different approaches, on Python 3.4, Linux x64. Excerpt from line profiler:
Line # Hits Time Per Hit % Time Line Contents
==============================================================
(...)
823 1508 11334 7.5 41.6 yday = int(period_end.strftime('%j'))
824 1508 2492 1.7 9.1 yday = period_end.toordinal() - date(period_end.year, 1, 1).toordinal() + 1
825 1508 1852 1.2 6.8 yday = (period_end - date(period_end.year, 1, 1)).days + 1
826 1508 5078 3.4 18.6 yday = period_end.timetuple().tm_yday
(...)
So most efficient is
yday = (period_end - date(period_end.year, 1, 1)).days
Function passed as template argument
Yes, it is valid.
As for making it work with functors as well, the usual solution is something like this instead:
template <typename F>
void doOperation(F f)
{
int temp=0;
f(temp);
std::cout << "Result is " << temp << std::endl;
}
which can now be called as either:
doOperation(add2);
doOperation(add3());
The problem with this is that if it makes it tricky for the compiler to inline the call to add2, since all the compiler knows is that a function pointer type void (*)(int &) is being passed to doOperation. (But add3, being a functor, can be inlined easily. Here, the compiler knows that an object of type add3 is passed to the function, which means that the function to call is add3::operator(), and not just some unknown function pointer.)
UTF-8 text is garbled when form is posted as multipart/form-data
To avoid converting all request parameters manually to UTF-8, you can define a method annotated with @InitBinder in your controller:
@InitBinder
protected void initBinder(WebDataBinder binder) {
binder.registerCustomEditor(String.class, new CharacterEditor(true) {
@Override
public void setAsText(String text) throws IllegalArgumentException {
String properText = new String(text.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8);
setValue(properText);
}
});
}
The above will automatically convert all request parameters to UTF-8 in the controller where it is defined.
Docker: Multiple Dockerfiles in project
Add an abstraction layer, for example, a YAML file like in this project https://github.com/larytet/dockerfile-generator which looks like
centos7:
base: centos:centos7
packager: rpm
install:
- $build_essential_centos
- rpm-build
run:
- $get_release
env:
- $environment_vars
A short Python script/make can generate all Dockerfiles from the configuration file.
Adding additional data to select options using jQuery
To store another value in select options:
$("#select").append('<option value="4">another</option>')
find a minimum value in an array of floats
If min value in array, you can try like:
>>> mydict = {"a": -1.5, "b": -1000.44, "c": -3}
>>> min(mydict.values())
-1000.44
What is the best way to calculate a checksum for a file that is on my machine?
On Windows : you can use FCIV utility : http://support.microsoft.com/kb/841290
On Unix/Linux : you can use md5sum : http://linux.about.com/library/cmd/blcmdl1_md5sum.htm
How do I make a composite key with SQL Server Management Studio?
create table my_table (
id_part1 int not null,
id_part2 int not null,
primary key (id_part1, id_part2)
)
How to use z-index in svg elements?
Push SVG element to last, so that its z-index will be in top. In SVG, there s no property called z-index. try below javascript to bring the element to top.
var Target = document.getElementById(event.currentTarget.id);
var svg = document.getElementById("SVGEditor");
svg.insertBefore(Target, svg.lastChild.nextSibling);
Target: Is an element for which we need to bring it to top svg: Is the container of elements
AngularJS: Uncaught Error: [$injector:modulerr] Failed to instantiate module?
For people having the same error with a similar code:
$(function(){
var app = angular.module("myApp", []);
app.controller('myController', function(){
});
});
Removing the $(function(){ ... }); solved the error.
How do I fix 'ImportError: cannot import name IncompleteRead'?
Check if have a python interpreter alive in any of the terminal windows. If so kill it and try sudo pip which worked for me.
How to add text to JFrame?
when I create my JLabel and enter the text to it, there is no wordwrap or anything
HTML formatting can be used to cause word wrap in any Swing component that offers styled text. E.G. as demonstrated in this answer.
How to stop a thread created by implementing runnable interface?
Stopping (Killing) a thread mid-way is not recommended. The API is actually deprecated.
However,you can get more details including workarounds here: How do you kill a thread in Java?
.ssh directory not being created
As a slight improvement over the other answers, you can do the mkdir and chmod as a single operation using mkdir's -m switch.
$ mkdir -m 700 ${HOME}/.ssh
Usage
From a Linux system
$ mkdir --help
Usage: mkdir [OPTION]... DIRECTORY...
Create the DIRECTORY(ies), if they do not already exist.
Mandatory arguments to long options are mandatory for short options too.
-m, --mode=MODE set file mode (as in chmod), not a=rwx - umask
...
...
Format an Integer using Java String Format
Use %03d in the format specifier for the integer. The 0 means that the number will be zero-filled if it is less than three (in this case) digits.
See the Formatter docs for other modifiers.
How to submit an HTML form on loading the page?
You can try also using below script
<html>
<head>
<script>
function load()
{
document.frm1.submit()
}
</script>
</head>
<body onload="load()">
<form action="http://www.google.com" id="frm1" name="frm1">
<input type="text" value="" />
</form>
</body>
</html>
How to Debug Variables in Smarty like in PHP var_dump()
This should work:
{$var|@print_r}
or
{$var|@var_dump}
The @ is needed for arrays to make smarty run the modifier against the whole thing, otherwise it does it for each element.
Delete last commit in bitbucket
You can write the command also for Bitbucket as mentioned by Dustin:
git push -f origin HEAD^:master
Note: instead of master you can use any branch. And it deletes just push on Bitbucket.
To remove last commit locally in git use:
git reset --hard HEAD~1
Can I pass parameters by reference in Java?
Can I pass parameters by reference in Java?
No.
Why ? Java has only one mode of passing arguments to methods: by value.
Note:
For primitives this is easy to understand: you get a copy of the value.
For all other you get a copy of the reference and this is called also passing by value.
It is all in this picture:
Need to perform Wildcard (*,?, etc) search on a string using Regex
Windows and *nux treat wildcards differently. *, ? and . are processed in a very complex way by Windows, one's presence or position would change another's meaning. While *nux keeps it simple, all it does is just one simple pattern match. Besides that, Windows matches ? for 0 or 1 chars, Linux matches it for exactly 1 chars.
I didn't find authoritative documents on this matter, here is just my conclusion based on days of tests on Windows 8/XP (command line, dir command to be specific, and the Directory.GetFiles method uses the same rules too) and Ubuntu Server 12.04.1 (ls command). I made tens of common and uncommon cases work, although there'are many failed cases too.
The current answer by Gabe, works like *nux. If you also want a Windows style one, and are willing to accept the imperfection, then here it is:
/// <summary>
/// <para>Tests if a file name matches the given wildcard pattern, uses the same rule as shell commands.</para>
/// </summary>
/// <param name="fileName">The file name to test, without folder.</param>
/// <param name="pattern">A wildcard pattern which can use char * to match any amount of characters; or char ? to match one character.</param>
/// <param name="unixStyle">If true, use the *nix style wildcard rules; otherwise use windows style rules.</param>
/// <returns>true if the file name matches the pattern, false otherwise.</returns>
public static bool MatchesWildcard(this string fileName, string pattern, bool unixStyle)
{
if (fileName == null)
throw new ArgumentNullException("fileName");
if (pattern == null)
throw new ArgumentNullException("pattern");
if (unixStyle)
return WildcardMatchesUnixStyle(pattern, fileName);
return WildcardMatchesWindowsStyle(fileName, pattern);
}
private static bool WildcardMatchesWindowsStyle(string fileName, string pattern)
{
var dotdot = pattern.IndexOf("..", StringComparison.Ordinal);
if (dotdot >= 0)
{
for (var i = dotdot; i < pattern.Length; i++)
if (pattern[i] != '.')
return false;
}
var normalized = Regex.Replace(pattern, @"\.+$", "");
var endsWithDot = normalized.Length != pattern.Length;
var endWeight = 0;
if (endsWithDot)
{
var lastNonWildcard = normalized.Length - 1;
for (; lastNonWildcard >= 0; lastNonWildcard--)
{
var c = normalized[lastNonWildcard];
if (c == '*')
endWeight += short.MaxValue;
else if (c == '?')
endWeight += 1;
else
break;
}
if (endWeight > 0)
normalized = normalized.Substring(0, lastNonWildcard + 1);
}
var endsWithWildcardDot = endWeight > 0;
var endsWithDotWildcardDot = endsWithWildcardDot && normalized.EndsWith(".");
if (endsWithDotWildcardDot)
normalized = normalized.Substring(0, normalized.Length - 1);
normalized = Regex.Replace(normalized, @"(?!^)(\.\*)+$", @".*");
var escaped = Regex.Escape(normalized);
string head, tail;
if (endsWithDotWildcardDot)
{
head = "^" + escaped;
tail = @"(\.[^.]{0," + endWeight + "})?$";
}
else if (endsWithWildcardDot)
{
head = "^" + escaped;
tail = "[^.]{0," + endWeight + "}$";
}
else
{
head = "^" + escaped;
tail = "$";
}
if (head.EndsWith(@"\.\*") && head.Length > 5)
{
head = head.Substring(0, head.Length - 4);
tail = @"(\..*)?" + tail;
}
var regex = head.Replace(@"\*", ".*").Replace(@"\?", "[^.]?") + tail;
return Regex.IsMatch(fileName, regex, RegexOptions.IgnoreCase);
}
private static bool WildcardMatchesUnixStyle(string pattern, string text)
{
var regex = "^" + Regex.Escape(pattern)
.Replace("\\*", ".*")
.Replace("\\?", ".")
+ "$";
return Regex.IsMatch(text, regex);
}
There's a funny thing, even the Windows API PathMatchSpec does not agree with FindFirstFile. Just try a1*., FindFirstFile says it matches a1, PathMatchSpec says not.
How to force view controller orientation in iOS 8?
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[UIViewController attemptRotationToDeviceOrientation];
}
How to extract text from an existing docx file using python-docx
you can try this also
from docx import Document
document = Document('demo.docx')
for para in document.paragraphs:
print(para.text)
How to split a string of space separated numbers into integers?
This should work:
[ int(x) for x in "40 1".split(" ") ]
No matching client found for package name (Google Analytics) - multiple productFlavors & buildTypes
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.package.name"
minSdkVersion 19
targetSdkVersion 27
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
make sure Gradle.app's applicationId is same your package name. my problem was this and I solved this way
Should you choose the MONEY or DECIMAL(x,y) datatypes in SQL Server?
I found a reason about using decimal over money in accuracy subject.
DECLARE @dOne DECIMAL(19,4),
@dThree DECIMAL(19,4),
@mOne MONEY,
@mThree MONEY,
@fOne FLOAT,
@fThree FLOAT
SELECT @dOne = 1,
@dThree = 3,
@mOne = 1,
@mThree = 3,
@fOne = 1,
@fThree = 3
SELECT (@dOne/@dThree)*@dThree AS DecimalResult,
(@mOne/@mThree)*@mThree AS MoneyResult,
(@fOne/@fThree)*@fThree AS FloatResult
DecimalResult > 1.000000
MoneyResult > 0.9999
FloatResult > 1
Just test it and make your decision.
Correct way to integrate jQuery plugins in AngularJS
Yes, you are correct. If you are using a jQuery plugin, do not put the code in the controller. Instead create a directive and put the code that you would normally have inside the link function of the directive.
There are a couple of points in the documentation that you could take a look at. You can find them here:
Common Pitfalls
Ensure that when you are referencing the script in your view, you refer it last - after the angularjs library, controllers, services and filters are referenced.
EDIT: Rather than using $(element), you can make use of angular.element(element) when using AngularJS with jQuery
How to align matching values in two columns in Excel, and bring along associated values in other columns
Skip all of this. Download Microsoft FUZZY LOOKUP add in. Create tables using your columns. Create a new worksheet. INPUT tables into the tool. Click all corresponding columns check boxes. Use slider for exact matches. HIT go and wait for the magic.
Fixed Table Cell Width
You could try using the <col> tag manage table styling for all rows but you will need to set the table-layout:fixed style on the <table> or the tables css class and set the overflow style for the cells
http://www.w3schools.com/TAGS/tag_col.asp
<table class="fixed">
<col width="20px" />
<col width="30px" />
<col width="40px" />
<tr>
<td>text</td>
<td>text</td>
<td>text</td>
</tr>
</table>
and this be your CSS
table.fixed { table-layout:fixed; }
table.fixed td { overflow: hidden; }
mysqli::mysqli(): (HY000/2002): Can't connect to local MySQL server through socket 'MySQL' (2)
If 'localhost' doesn't work but 127.0.0.1 does. Make sure your local hosts file points to the correct location. (/etc/hosts for linux/mac, C:\Windows\System32\drivers\etc\hosts for windows).
Also, make sure your user is allowed to connect to whatever database you're trying to select.
Combine two data frames by rows (rbind) when they have different sets of columns
I wrote a function to do this because I like my code to tell me if something is wrong. This function will explicitly tell you which column names don't match and if you have a type mismatch. Then it will do its best to combine the data.frames anyway. The limitation is that you can only combine two data.frames at a time.
### combines data frames (like rbind) but by matching column names
# columns without matches in the other data frame are still combined
# but with NA in the rows corresponding to the data frame without
# the variable
# A warning is issued if there is a type mismatch between columns of
# the same name and an attempt is made to combine the columns
combineByName <- function(A,B) {
a.names <- names(A)
b.names <- names(B)
all.names <- union(a.names,b.names)
print(paste("Number of columns:",length(all.names)))
a.type <- NULL
for (i in 1:ncol(A)) {
a.type[i] <- typeof(A[,i])
}
b.type <- NULL
for (i in 1:ncol(B)) {
b.type[i] <- typeof(B[,i])
}
a_b.names <- names(A)[!names(A)%in%names(B)]
b_a.names <- names(B)[!names(B)%in%names(A)]
if (length(a_b.names)>0 | length(b_a.names)>0){
print("Columns in data frame A but not in data frame B:")
print(a_b.names)
print("Columns in data frame B but not in data frame A:")
print(b_a.names)
} else if(a.names==b.names & a.type==b.type){
C <- rbind(A,B)
return(C)
}
C <- list()
for(i in 1:length(all.names)) {
l.a <- all.names[i]%in%a.names
pos.a <- match(all.names[i],a.names)
typ.a <- a.type[pos.a]
l.b <- all.names[i]%in%b.names
pos.b <- match(all.names[i],b.names)
typ.b <- b.type[pos.b]
if(l.a & l.b) {
if(typ.a==typ.b) {
vec <- c(A[,pos.a],B[,pos.b])
} else {
warning(c("Type mismatch in variable named: ",all.names[i],"\n"))
vec <- try(c(A[,pos.a],B[,pos.b]))
}
} else if (l.a) {
vec <- c(A[,pos.a],rep(NA,nrow(B)))
} else {
vec <- c(rep(NA,nrow(A)),B[,pos.b])
}
C[[i]] <- vec
}
names(C) <- all.names
C <- as.data.frame(C)
return(C)
}
What is the correct syntax of ng-include?
For those who are looking for the shortest possible "item renderer" solution from a partial, so a combo of ng-repeat and ng-include:
<div ng-repeat="item in items" ng-include src="'views/partials/item.html'" />
Actually, if you use it like this for one repeater, it will work, but won't for 2 of them! Angular (v1.2.16) will freak out for some reason if you have 2 of these one after another, so it is safer to close the div the pre-xhtml way:
<div ng-repeat="item in items" ng-include src="'views/partials/item.html'"></div>
Convert any object to a byte[]
Use the BinaryFormatter:
byte[] ObjectToByteArray(object obj)
{
if(obj == null)
return null;
BinaryFormatter bf = new BinaryFormatter();
using (MemoryStream ms = new MemoryStream())
{
bf.Serialize(ms, obj);
return ms.ToArray();
}
}
Note that obj and any properties/fields within obj (and so-on for all of their properties/fields) will all need to be tagged with the Serializable attribute to successfully be serialized with this.
How to accept Date params in a GET request to Spring MVC Controller?
Ok, I solved it. Writing it for anyone who might be tired after a full day of non-stop coding & miss such a silly thing.
@RequestMapping(value="/fetch" , method=RequestMethod.GET)
public @ResponseBody String fetchResult(@RequestParam("from") @DateTimeFormat(pattern="yyyy-MM-dd") Date fromDate) {
//Content goes here
}
Yes, it's simple. Just add the DateTimeFormat annotation.
Calling Web API from MVC controller
Controller:
public JsonResult GetProductsData()
{
using (var client = new HttpClient())
{
client.BaseAddress = new Uri("http://localhost:5136/api/");
//HTTP GET
var responseTask = client.GetAsync("product");
responseTask.Wait();
var result = responseTask.Result;
if (result.IsSuccessStatusCode)
{
var readTask = result.Content.ReadAsAsync<IList<product>>();
readTask.Wait();
var alldata = readTask.Result;
var rsproduct = from x in alldata
select new[]
{
Convert.ToString(x.pid),
Convert.ToString(x.pname),
Convert.ToString(x.pprice),
};
return Json(new
{
aaData = rsproduct
},
JsonRequestBehavior.AllowGet);
}
else //web api sent error response
{
//log response status here..
var pro = Enumerable.Empty<product>();
return Json(new
{
aaData = pro
},
JsonRequestBehavior.AllowGet);
}
}
}
public JsonResult InupProduct(string id,string pname, string pprice)
{
try
{
product obj = new product
{
pid = Convert.ToInt32(id),
pname = pname,
pprice = Convert.ToDecimal(pprice)
};
using (var client = new HttpClient())
{
client.BaseAddress = new Uri("http://localhost:5136/api/product");
if(id=="0")
{
//insert........
//HTTP POST
var postTask = client.PostAsJsonAsync<product>("product", obj);
postTask.Wait();
var result = postTask.Result;
if (result.IsSuccessStatusCode)
{
return Json(1, JsonRequestBehavior.AllowGet);
}
else
{
return Json(0, JsonRequestBehavior.AllowGet);
}
}
else
{
//update........
//HTTP POST
var postTask = client.PutAsJsonAsync<product>("product", obj);
postTask.Wait();
var result = postTask.Result;
if (result.IsSuccessStatusCode)
{
return Json(1, JsonRequestBehavior.AllowGet);
}
else
{
return Json(0, JsonRequestBehavior.AllowGet);
}
}
}
/*context.InUPProduct(Convert.ToInt32(id),pname,Convert.ToDecimal(pprice));
return Json(1, JsonRequestBehavior.AllowGet);*/
}
catch (Exception ex)
{
return Json(0, JsonRequestBehavior.AllowGet);
}
}
public JsonResult deleteRecord(int ID)
{
try
{
using (var client = new HttpClient())
{
client.BaseAddress = new Uri("http://localhost:5136/api/product");
//HTTP DELETE
var deleteTask = client.DeleteAsync("product/" + ID);
deleteTask.Wait();
var result = deleteTask.Result;
if (result.IsSuccessStatusCode)
{
return Json(1, JsonRequestBehavior.AllowGet);
}
else
{
return Json(0, JsonRequestBehavior.AllowGet);
}
}
/* var data = context.products.Where(x => x.pid == ID).FirstOrDefault();
context.products.Remove(data);
context.SaveChanges();
return Json(1, JsonRequestBehavior.AllowGet);*/
}
catch (Exception ex)
{
return Json(0, JsonRequestBehavior.AllowGet);
}
}
How to get all of the immediate subdirectories in Python
Using Twisted's FilePath module:
from twisted.python.filepath import FilePath
def subdirs(pathObj):
for subpath in pathObj.walk():
if subpath.isdir():
yield subpath
if __name__ == '__main__':
for subdir in subdirs(FilePath(".")):
print "Subdirectory:", subdir
Since some commenters have asked what the advantages of using Twisted's libraries for this is, I'll go a bit beyond the original question here.
There's some improved documentation in a branch that explains the advantages of FilePath; you might want to read that.
More specifically in this example: unlike the standard library version, this function can be implemented with no imports. The "subdirs" function is totally generic, in that it operates on nothing but its argument. In order to copy and move the files using the standard library, you need to depend on the "open" builtin, "listdir", perhaps "isdir" or "os.walk" or "shutil.copy". Maybe "os.path.join" too. Not to mention the fact that you need a string passed an argument to identify the actual file. Let's take a look at the full implementation which will copy each directory's "index.tpl" to "index.html":
def copyTemplates(topdir):
for subdir in subdirs(topdir):
tpl = subdir.child("index.tpl")
if tpl.exists():
tpl.copyTo(subdir.child("index.html"))
The "subdirs" function above can work on any FilePath-like object. Which means, among other things, ZipPath objects. Unfortunately ZipPath is read-only right now, but it could be extended to support writing.
You can also pass your own objects for testing purposes. In order to test the os.path-using APIs suggested here, you have to monkey with imported names and implicit dependencies and generally perform black magic to get your tests to work. With FilePath, you do something like this:
class MyFakePath:
def child(self, name):
"Return an appropriate child object"
def walk(self):
"Return an iterable of MyFakePath objects"
def exists(self):
"Return true or false, as appropriate to the test"
def isdir(self):
"Return true or false, as appropriate to the test"
...
subdirs(MyFakePath(...))
How do I clear a search box with an 'x' in bootstrap 3?
AngularJS / UI-Bootstrap Answer
- Use Bootstrap's has-feedback class to show an icon inside the input field.
- Make sure the icon has
style="cursor: pointer; pointer-events: all;" - Use
ng-clickto clear the text.
JavaScript (app.js)
var app = angular.module('plunker', ['ui.bootstrap']);
app.controller('MainCtrl', function($scope) {
$scope.params = {};
$scope.clearText = function() {
$scope.params.text = null;
}
});
HTML (index.html snippet)
<div class="form-group has-feedback">
<label>text box</label>
<input type="text"
ng-model="params.text"
class="form-control"
placeholder="type something here...">
<span ng-if="params.text"
ng-click="clearText()"
class="glyphicon glyphicon-remove form-control-feedback"
style="cursor: pointer; pointer-events: all;"
uib-tooltip="clear">
</span>
</div>
Here's the plunker: http://plnkr.co/edit/av9VFw?p=preview
How to "flatten" a multi-dimensional array to simple one in PHP?
Another method from PHP's user comments (simplified) and here:
function array_flatten_recursive($array) {
if (!$array) return false;
$flat = array();
$RII = new RecursiveIteratorIterator(new RecursiveArrayIterator($array));
foreach ($RII as $value) $flat[] = $value;
return $flat;
}
The big benefit of this method is that it tracks the depth of the recursion, should you need that while flattening.
This will output:
$array = array(
'A' => array('B' => array( 1, 2, 3)),
'C' => array(4, 5)
);
print_r(array_flatten_recursive($array));
#Returns:
Array (
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
)
How to move from one fragment to another fragment on click of an ImageView in Android?
Add this code where you want to click and load Fragment. I hope it's work for you.
Fragment fragment = new yourfragment();
FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
How to make function decorators and chain them together?
Another way of doing the same thing:
class bol(object):
def __init__(self, f):
self.f = f
def __call__(self):
return "<b>{}</b>".format(self.f())
class ita(object):
def __init__(self, f):
self.f = f
def __call__(self):
return "<i>{}</i>".format(self.f())
@bol
@ita
def sayhi():
return 'hi'
Or, more flexibly:
class sty(object):
def __init__(self, tag):
self.tag = tag
def __call__(self, f):
def newf():
return "<{tag}>{res}</{tag}>".format(res=f(), tag=self.tag)
return newf
@sty('b')
@sty('i')
def sayhi():
return 'hi'
AngularJS : Custom filters and ng-repeat
You can call more of 1 function filters in the same ng-repeat filter
<article data-ng-repeat="result in results | filter:search() | filter:filterFn()" class="result">
Declaring and initializing a string array in VB.NET
Array initializer support for type inference were changed in Visual Basic 10 vs Visual Basic 9.
In previous version of VB it was required to put empty parens to signify an array. Also, it would define the array as object array unless otherwise was stated:
' Integer array
Dim i as Integer() = {1, 2, 3, 4}
' Object array
Dim o() = {1, 2, 3}
Check more info:
How to download Xcode DMG or XIP file?
You can find the DMGs or XIPs for Xcode and other development tools on https://developer.apple.com/download/more/ (requires Apple ID to login).
You must login to have a valid session before downloading anything below.
*(Newest on top. For each minor version (6.3, 5.1, etc.) only the latest revision is kept in the list.)
*With Xcode 12.2, Apple introduces the term “Release Candidate” (RC) which replaces “GM seed” and indicates this version is near final.
Xcode 12
12.4 (requires a Mac with Apple silicon running macOS Big Sur 11 or later, or an Intel-based Mac running macOS Catalina 10.15.4 or later) (Latest as of 27-Jan-2021)
12.3 (requires a Mac with Apple silicon running macOS Big Sur 11 or later, or an Intel-based Mac running macOS Catalina 10.15.4 or later)
12.0.1 (Requires macOS 10.15.4 or later) (Latest as of 24-Sept-2020)
Xcode 11
11.7 (Latest as of Sept 02 2020)
11.4.1 (Requires macOS 10.15.2 or later)
11 (Requires macOS 10.14.4 or later)
Xcode 10 (unsupported for iTunes Connect)
- 10.3 (Requires macOS 10.14.3 or later)
- 10.2.1 (Requires macOS 10.14.3 or later)
- 10.1 (Last version supporting macOS 10.13.6 High Sierra)
- 10 (Subsequent versions were unsupported for iTunes Connect from March 2019)
Xcode 9
Xcode 8
Xcode 7
Xcode 6
Even Older Versions (unsupported for iTunes Connect)
Async always WaitingForActivation
this code seems to have address the issue for me. it comes for a streaming class, ergo some of the nomenclature.
''' <summary> Reference to the awaiting task. </summary>
''' <value> The awaiting task. </value>
Protected ReadOnly Property AwaitingTask As Threading.Tasks.Task
''' <summary> Reference to the Action task; this task status undergoes changes. </summary>
Protected ReadOnly Property ActionTask As Threading.Tasks.Task
''' <summary> Reference to the cancellation source. </summary>
Protected ReadOnly Property TaskCancellationSource As Threading.CancellationTokenSource
''' <summary> Starts the action task. </summary>
''' <param name="taskAction"> The action to stream the entities, which calls
''' <see cref="StreamEvents(Of T)(IEnumerable(Of T), IEnumerable(Of Date), Integer, String)"/>. </param>
''' <returns> The awaiting task. </returns>
Private Async Function AsyncAwaitTask(ByVal taskAction As Action) As Task
Me._ActionTask = Task.Run(taskAction)
Await Me.ActionTask ' Task.Run(streamEntitiesAction)
Try
Me.ActionTask?.Wait()
Me.OnStreamTaskEnded(If(Me.ActionTask Is Nothing, TaskStatus.RanToCompletion, Me.ActionTask.Status))
Catch ex As AggregateException
Me.OnExceptionOccurred(ex)
Finally
Me.TaskCancellationSource.Dispose()
End Try
End Function
''' <summary> Starts Streaming the events. </summary>
''' <exception cref="InvalidOperationException"> Thrown when the requested operation is invalid. </exception>
''' <param name="bucketKey"> The bucket key. </param>
''' <param name="timeout"> The timeout. </param>
''' <param name="streamEntitiesAction"> The action to stream the entities, which calls
''' <see cref="StreamEvents(Of T)(IEnumerable(Of T), IEnumerable(Of Date), Integer, String)"/>. </param>
Public Overridable Sub StartStreamEvents(ByVal bucketKey As String, ByVal timeout As TimeSpan, ByVal streamEntitiesAction As Action)
If Me.IsTaskActive Then
Throw New InvalidOperationException($"Stream task is {Me.ActionTask.Status}")
Else
Me._TaskCancellationSource = New Threading.CancellationTokenSource
Me.TaskCancellationSource.Token.Register(AddressOf Me.StreamTaskCanceled)
Me.TaskCancellationSource.CancelAfter(timeout)
' the action class is created withing the Async/Await function
Me._AwaitingTask = Me.AsyncAwaitTask(streamEntitiesAction)
End If
End Sub
Get statistics for each group (such as count, mean, etc) using pandas GroupBy?
Quick Answer:
The simplest way to get row counts per group is by calling .size(), which returns a Series:
df.groupby(['col1','col2']).size()
Usually you want this result as a DataFrame (instead of a Series) so you can do:
df.groupby(['col1', 'col2']).size().reset_index(name='counts')
If you want to find out how to calculate the row counts and other statistics for each group continue reading below.
Detailed example:
Consider the following example dataframe:
In [2]: df
Out[2]:
col1 col2 col3 col4 col5 col6
0 A B 0.20 -0.61 -0.49 1.49
1 A B -1.53 -1.01 -0.39 1.82
2 A B -0.44 0.27 0.72 0.11
3 A B 0.28 -1.32 0.38 0.18
4 C D 0.12 0.59 0.81 0.66
5 C D -0.13 -1.65 -1.64 0.50
6 C D -1.42 -0.11 -0.18 -0.44
7 E F -0.00 1.42 -0.26 1.17
8 E F 0.91 -0.47 1.35 -0.34
9 G H 1.48 -0.63 -1.14 0.17
First let's use .size() to get the row counts:
In [3]: df.groupby(['col1', 'col2']).size()
Out[3]:
col1 col2
A B 4
C D 3
E F 2
G H 1
dtype: int64
Then let's use .size().reset_index(name='counts') to get the row counts:
In [4]: df.groupby(['col1', 'col2']).size().reset_index(name='counts')
Out[4]:
col1 col2 counts
0 A B 4
1 C D 3
2 E F 2
3 G H 1
Including results for more statistics
When you want to calculate statistics on grouped data, it usually looks like this:
In [5]: (df
...: .groupby(['col1', 'col2'])
...: .agg({
...: 'col3': ['mean', 'count'],
...: 'col4': ['median', 'min', 'count']
...: }))
Out[5]:
col4 col3
median min count mean count
col1 col2
A B -0.810 -1.32 4 -0.372500 4
C D -0.110 -1.65 3 -0.476667 3
E F 0.475 -0.47 2 0.455000 2
G H -0.630 -0.63 1 1.480000 1
The result above is a little annoying to deal with because of the nested column labels, and also because row counts are on a per column basis.
To gain more control over the output I usually split the statistics into individual aggregations that I then combine using join. It looks like this:
In [6]: gb = df.groupby(['col1', 'col2'])
...: counts = gb.size().to_frame(name='counts')
...: (counts
...: .join(gb.agg({'col3': 'mean'}).rename(columns={'col3': 'col3_mean'}))
...: .join(gb.agg({'col4': 'median'}).rename(columns={'col4': 'col4_median'}))
...: .join(gb.agg({'col4': 'min'}).rename(columns={'col4': 'col4_min'}))
...: .reset_index()
...: )
...:
Out[6]:
col1 col2 counts col3_mean col4_median col4_min
0 A B 4 -0.372500 -0.810 -1.32
1 C D 3 -0.476667 -0.110 -1.65
2 E F 2 0.455000 0.475 -0.47
3 G H 1 1.480000 -0.630 -0.63
Footnotes
The code used to generate the test data is shown below:
In [1]: import numpy as np
...: import pandas as pd
...:
...: keys = np.array([
...: ['A', 'B'],
...: ['A', 'B'],
...: ['A', 'B'],
...: ['A', 'B'],
...: ['C', 'D'],
...: ['C', 'D'],
...: ['C', 'D'],
...: ['E', 'F'],
...: ['E', 'F'],
...: ['G', 'H']
...: ])
...:
...: df = pd.DataFrame(
...: np.hstack([keys,np.random.randn(10,4).round(2)]),
...: columns = ['col1', 'col2', 'col3', 'col4', 'col5', 'col6']
...: )
...:
...: df[['col3', 'col4', 'col5', 'col6']] = \
...: df[['col3', 'col4', 'col5', 'col6']].astype(float)
...:
Disclaimer:
If some of the columns that you are aggregating have null values, then you really want to be looking at the group row counts as an independent aggregation for each column. Otherwise you may be misled as to how many records are actually being used to calculate things like the mean because pandas will drop NaN entries in the mean calculation without telling you about it.
Proxies with Python 'Requests' module
I share some code how to fetch proxies from the site "https://free-proxy-list.net" and store data to a file compatible with tools like "Elite Proxy Switcher"(format IP:PORT):
##PROXY_UPDATER - get free proxies from https://free-proxy-list.net/
from lxml.html import fromstring
import requests
from itertools import cycle
import traceback
import re
######################FIND PROXIES#########################################
def get_proxies():
url = 'https://free-proxy-list.net/'
response = requests.get(url)
parser = fromstring(response.text)
proxies = set()
for i in parser.xpath('//tbody/tr')[:299]: #299 proxies max
proxy = ":".join([i.xpath('.//td[1]/text()')
[0],i.xpath('.//td[2]/text()')[0]])
proxies.add(proxy)
return proxies
######################write to file in format IP:PORT######################
try:
proxies = get_proxies()
f=open('proxy_list.txt','w')
for proxy in proxies:
f.write(proxy+'\n')
f.close()
print ("DONE")
except:
print ("MAJOR ERROR")
jQuery - Illegal invocation
In my case, I just changed
Note: This is in case of Django, so I added csrftoken. In your case, you may not need it.
Added
contentType: false,processData: falseCommented out
"Content-Type": "application/json"
$.ajax({
url: location.pathname,
type: "POST",
crossDomain: true,
dataType: "json",
headers: {
"X-CSRFToken": csrftoken,
"Content-Type": "application/json"
},
data:formData,
success: (response, textStatus, jQxhr) => {
},
error: (jQxhr, textStatus, errorThrown) => {
}
})
to
$.ajax({
url: location.pathname,
type: "POST",
crossDomain: true,
dataType: "json",
contentType: false,
processData: false,
headers: {
"X-CSRFToken": csrftoken
// "Content-Type": "application/json",
},
data:formData,
success: (response, textStatus, jQxhr) => {
},
error: (jQxhr, textStatus, errorThrown) => {
}
})
and it worked.
running php script (php function) in linux bash
php test.php
should do it, or
php -f test.php
to be explicit.
SQLException: No suitable Driver Found for jdbc:oracle:thin:@//localhost:1521/orcl
i have changed my old path: jdbc:odbc:thin:@localhost:1521:orcl
to new : jdbc:oracle:thin:@//localhost:1521/orcl
and it worked for me.....hurrah!! image
"Unmappable character for encoding UTF-8" error
In eclipse try to go to file properties (Alt+Enter) and change the Resource → 'Text File encoding' → Other to UTF-8. Reopen the file and check there will be junk character somewhere in the string/file. Remove it. Save the file.
Change the encoding Resource → 'Text File encoding' back to Default.
Compile and deploy the code.
View array in Visual Studio debugger?
I use the ArrayDebugView add-in for Visual Studio (http://arraydebugview.sourceforge.net/).
It seems to be a long dead project (but one I'm looking at continuing myself) but the add-in still works beautifully for me in VS2010 for both C++ and C#.
It has a few quirks (tab order, modal dialog, no close button) but the ability to plot the contents of an array in a graph more than make up for it.
Edit July 2014: I have finally built a new Visual Studio extension to replace ArrayebugView's functionality. It is available on the VIsual Studio Gallery, search for ArrayPlotter or go to http://visualstudiogallery.msdn.microsoft.com/2fde2c3c-5b83-4d2a-a71e-5fdd83ce6b96?SRC=Home
"Gradle Version 2.10 is required." Error
Open Preference and search for Gradle or Navigate to Builds, Execution, Deployment > Build Tools > Gradle
Then change Project-Level setting to Use default gradle wrapper (recommended)
Or keep local gradle distribution option and set Gradle home to /.../gradle-2.10
Make Sure that Gradle version is already setup to 2.10 in Module Settings
On the Project Window, right click on your project then select Open Module Settings (?+?)
Update
Gradle Version: 3.3 Android Plugin version: 2.3.1
What is memoization and how can I use it in Python?
Well I should answer the first part first: what's memoization?
It's just a method to trade memory for time. Think of Multiplication Table.
Using mutable object as default value in Python is usually considered bad. But if use it wisely, it can actually be useful to implement a memoization.
Here's an example adapted from http://docs.python.org/2/faq/design.html#why-are-default-values-shared-between-objects
Using a mutable dict in the function definition, the intermediate computed results can be cached (e.g. when calculating factorial(10) after calculate factorial(9), we can reuse all the intermediate results)
def factorial(n, _cache={1:1}):
try:
return _cache[n]
except IndexError:
_cache[n] = factorial(n-1)*n
return _cache[n]
Export SQL query data to Excel
For anyone coming here looking for how to do this in C#, I have tried the following method and had success in dotnet core 2.0.3 and entity framework core 2.0.3
First create your model class.
public class User
{
public string Name { get; set; }
public int Address { get; set; }
public int ZIP { get; set; }
public string Gender { get; set; }
}
Then install EPPlus Nuget package. (I used version 4.0.5, probably will work for other versions as well.)
Install-Package EPPlus -Version 4.0.5
The create ExcelExportHelper class, which will contain the logic to convert dataset to Excel rows. This class do not have dependencies with your model class or dataset.
public class ExcelExportHelper
{
public static string ExcelContentType
{
get
{ return "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"; }
}
public static DataTable ListToDataTable<T>(List<T> data)
{
PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(typeof(T));
DataTable dataTable = new DataTable();
for (int i = 0; i < properties.Count; i++)
{
PropertyDescriptor property = properties[i];
dataTable.Columns.Add(property.Name, Nullable.GetUnderlyingType(property.PropertyType) ?? property.PropertyType);
}
object[] values = new object[properties.Count];
foreach (T item in data)
{
for (int i = 0; i < values.Length; i++)
{
values[i] = properties[i].GetValue(item);
}
dataTable.Rows.Add(values);
}
return dataTable;
}
public static byte[] ExportExcel(DataTable dataTable, string heading = "", bool showSrNo = false, params string[] columnsToTake)
{
byte[] result = null;
using (ExcelPackage package = new ExcelPackage())
{
ExcelWorksheet workSheet = package.Workbook.Worksheets.Add(String.Format("{0} Data", heading));
int startRowFrom = String.IsNullOrEmpty(heading) ? 1 : 3;
if (showSrNo)
{
DataColumn dataColumn = dataTable.Columns.Add("#", typeof(int));
dataColumn.SetOrdinal(0);
int index = 1;
foreach (DataRow item in dataTable.Rows)
{
item[0] = index;
index++;
}
}
// add the content into the Excel file
workSheet.Cells["A" + startRowFrom].LoadFromDataTable(dataTable, true);
// autofit width of cells with small content
int columnIndex = 1;
foreach (DataColumn column in dataTable.Columns)
{
int maxLength;
ExcelRange columnCells = workSheet.Cells[workSheet.Dimension.Start.Row, columnIndex, workSheet.Dimension.End.Row, columnIndex];
try
{
maxLength = columnCells.Max(cell => cell.Value.ToString().Count());
}
catch (Exception) //nishanc
{
maxLength = columnCells.Max(cell => (cell.Value +"").ToString().Length);
}
//workSheet.Column(columnIndex).AutoFit();
if (maxLength < 150)
{
//workSheet.Column(columnIndex).AutoFit();
}
columnIndex++;
}
// format header - bold, yellow on black
using (ExcelRange r = workSheet.Cells[startRowFrom, 1, startRowFrom, dataTable.Columns.Count])
{
r.Style.Font.Color.SetColor(System.Drawing.Color.White);
r.Style.Font.Bold = true;
r.Style.Fill.PatternType = OfficeOpenXml.Style.ExcelFillStyle.Solid;
r.Style.Fill.BackgroundColor.SetColor(Color.Brown);
}
// format cells - add borders
using (ExcelRange r = workSheet.Cells[startRowFrom + 1, 1, startRowFrom + dataTable.Rows.Count, dataTable.Columns.Count])
{
r.Style.Border.Top.Style = ExcelBorderStyle.Thin;
r.Style.Border.Bottom.Style = ExcelBorderStyle.Thin;
r.Style.Border.Left.Style = ExcelBorderStyle.Thin;
r.Style.Border.Right.Style = ExcelBorderStyle.Thin;
r.Style.Border.Top.Color.SetColor(System.Drawing.Color.Black);
r.Style.Border.Bottom.Color.SetColor(System.Drawing.Color.Black);
r.Style.Border.Left.Color.SetColor(System.Drawing.Color.Black);
r.Style.Border.Right.Color.SetColor(System.Drawing.Color.Black);
}
// removed ignored columns
for (int i = dataTable.Columns.Count - 1; i >= 0; i--)
{
if (i == 0 && showSrNo)
{
continue;
}
if (!columnsToTake.Contains(dataTable.Columns[i].ColumnName))
{
workSheet.DeleteColumn(i + 1);
}
}
if (!String.IsNullOrEmpty(heading))
{
workSheet.Cells["A1"].Value = heading;
// workSheet.Cells["A1"].Style.Font.Size = 20;
workSheet.InsertColumn(1, 1);
workSheet.InsertRow(1, 1);
workSheet.Column(1).Width = 10;
}
result = package.GetAsByteArray();
}
return result;
}
public static byte[] ExportExcel<T>(List<T> data, string Heading = "", bool showSlno = false, params string[] ColumnsToTake)
{
return ExportExcel(ListToDataTable<T>(data), Heading, showSlno, ColumnsToTake);
}
}
Now add this method where you want to generate the excel file, probably for a method in the controller. You can pass parameters for your stored procedure as well. Note that the return type of the method is FileContentResult. Whatever query you execute, important thing is you must have the results in a List.
[HttpPost]
public async Task<FileContentResult> Create([Bind("Id,StartDate,EndDate")] GetReport getReport)
{
DateTime startDate = getReport.StartDate;
DateTime endDate = getReport.EndDate;
// call the stored procedure and store dataset in a List.
List<User> users = _context.Reports.FromSql("exec dbo.SP_GetEmpReport @start={0}, @end={1}", startDate, endDate).ToList();
//set custome column names
string[] columns = { "Name", "Address", "ZIP", "Gender"};
byte[] filecontent = ExcelExportHelper.ExportExcel(users, "Users", true, columns);
// set file name.
return File(filecontent, ExcelExportHelper.ExcelContentType, "Report.xlsx");
}
More details can be found here
Callback functions in C++
There isn't an explicit concept of a callback function in C++. Callback mechanisms are often implemented via function pointers, functor objects, or callback objects. The programmers have to explicitly design and implement callback functionality.
Edit based on feedback:
In spite of the negative feedback this answer has received, it is not wrong. I'll try to do a better job of explaining where I'm coming from.
C and C++ have everything you need to implement callback functions. The most common and trivial way to implement a callback function is to pass a function pointer as a function argument.
However, callback functions and function pointers are not synonymous. A function pointer is a language mechanism, while a callback function is a semantic concept. Function pointers are not the only way to implement a callback function - you can also use functors and even garden variety virtual functions. What makes a function call a callback is not the mechanism used to identify and call the function, but the context and semantics of the call. Saying something is a callback function implies a greater than normal separation between the calling function and the specific function being called, a looser conceptual coupling between the caller and the callee, with the caller having explicit control over what gets called. It is that fuzzy notion of looser conceptual coupling and caller-driven function selection that makes something a callback function, not the use of a function pointer.
For example, the .NET documentation for IFormatProvider says that "GetFormat is a callback method", even though it is just a run-of-the-mill interface method. I don't think anyone would argue that all virtual method calls are callback functions. What makes GetFormat a callback method is not the mechanics of how it is passed or invoked, but the semantics of the caller picking which object's GetFormat method will be called.
Some languages include features with explicit callback semantics, typically related to events and event handling. For example, C# has the event type with syntax and semantics explicitly designed around the concept of callbacks. Visual Basic has its Handles clause, which explicitly declares a method to be a callback function while abstracting away the concept of delegates or function pointers. In these cases, the semantic concept of a callback is integrated into the language itself.
C and C++, on the other hand, does not embed the semantic concept of callback functions nearly as explicitly. The mechanisms are there, the integrated semantics are not. You can implement callback functions just fine, but to get something more sophisticated which includes explicit callback semantics you have to build it on top of what C++ provides, such as what Qt did with their Signals and Slots.
In a nutshell, C++ has what you need to implement callbacks, often quite easily and trivially using function pointers. What it does not have is keywords and features whose semantics are specific to callbacks, such as raise, emit, Handles, event +=, etc. If you're coming from a language with those types of elements, the native callback support in C++ will feel neutered.
How to send an email using PHP?
For future readers: Try this if other answers don't work (As was the case with me):
1.) Download PHPMailer, open the zip file and extract the folder to your project directory.
3.) Rename the extracted directory to PHPMailer and write the below code inside of your php script (the script must be outside of the PHPMailer folder)
<?php
// PHPMailer classes into the global namespace
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;
// Base files
require 'PHPMailer/src/Exception.php';
require 'PHPMailer/src/PHPMailer.php';
require 'PHPMailer/src/SMTP.php';
// create object of PHPMailer class with boolean parameter which sets/unsets exception.
$mail = new PHPMailer(true);
try {
$mail->isSMTP(); // using SMTP protocol
$mail->Host = 'smtp.gmail.com'; // SMTP host as gmail
$mail->SMTPAuth = true; // enable smtp authentication
$mail->Username = '[email protected]'; // sender gmail host
$mail->Password = 'password'; // sender gmail host password
$mail->SMTPSecure = 'tls'; // for encrypted connection
$mail->Port = 587; // port for SMTP
$mail->setFrom('[email protected]', "Sender"); // sender's email and name
$mail->addAddress('[email protected]', "Receiver"); // receiver's email and name
$mail->Subject = 'Test subject';
$mail->Body = 'Test body';
$mail->send();
echo 'Message has been sent';
} catch (Exception $e) { // handle error.
echo 'Message could not be sent. Mailer Error: ', $mail->ErrorInfo;
}
?>
How to split one text file into multiple *.txt files?
Regardless to what is said above, on my ubuntu 16 i had to do :
> split -b 10M -d system.log system_split.log
Please note the space between -b and the value
How to install pip3 on Windows?
On Windows pip3 should be in the Scripts path of your Python installation:
C:\path\to\python\Scripts\pip3
Use:
where python
to find out where your Python executable(s) is/are located. The result should look like this:
C:\path\to\python\python.exe
or:
C:\path\to\python\python3.exe
You can check if pip3 works with this absolute path:
C:\path\to\python\Scripts\pip3
if yes, add C:\path\to\python\Scripts to your environmental variable PATH .
Service Reference Error: Failed to generate code for the service reference
Have to uncheck the Reuse types in all referenced assemblies from Configure service reference option
What is the difference between HTTP_HOST and SERVER_NAME in PHP?
It took me a while to understand what people meant by 'SERVER_NAME is more reliable'. I use a shared server and does not have access to virtual host directives. So, I use mod_rewrite in .htaccess to map different HTTP_HOSTs to different directories. In that case, it is HTTP_HOST that is meaningful.
The situation is similar if one uses name-based virtual hosts: the ServerName directive within a virtual host simply says which hostname will be mapped to this virtual host. The bottom line is that, in both cases, the hostname provided by the client during the request (HTTP_HOST), must be matched with a name within the server, which is itself mapped to a directory. Whether the mapping is done with virtual host directives or with htaccess mod_rewrite rules is secondary here. In these cases, HTTP_HOST will be the same as SERVER_NAME. I am glad that Apache is configured that way.
However, the situation is different with IP-based virtual hosts. In this case and only in this case, SERVER_NAME and HTTP_HOST can be different, because now the client selects the server by the IP, not by the name. Indeed, there might be special configurations where this is important.
So, starting from now, I will use SERVER_NAME, just in case my code is ported in these special configurations.
Is it better to use "is" or "==" for number comparison in Python?
That will only work for small numbers and I'm guessing it's also implementation-dependent. Python uses the same object instance for small numbers (iirc <256), but this changes for bigger numbers.
>>> a = 2104214124
>>> b = 2104214124
>>> a == b
True
>>> a is b
False
So you should always use == to compare numbers.
Calculate MD5 checksum for a file
I know this question was already answered, but this is what I use:
using (FileStream fStream = File.OpenRead(filename)) {
return GetHash<MD5>(fStream)
}
Where GetHash:
public static String GetHash<T>(Stream stream) where T : HashAlgorithm {
StringBuilder sb = new StringBuilder();
MethodInfo create = typeof(T).GetMethod("Create", new Type[] {});
using (T crypt = (T) create.Invoke(null, null)) {
byte[] hashBytes = crypt.ComputeHash(stream);
foreach (byte bt in hashBytes) {
sb.Append(bt.ToString("x2"));
}
}
return sb.ToString();
}
Probably not the best way, but it can be handy.
Count table rows
As mentioned by Santosh, I think this query is suitably fast, while not querying all the table.
To return integer result of number of data records, for a specific tablename in a particular database:
select TABLE_ROWS from information_schema.TABLES where TABLE_SCHEMA = 'database'
AND table_name='tablename';
Authorize a non-admin developer in Xcode / Mac OS
You should add yourself to the Developer Tools group. The general syntax for adding a user to a group in OS X is as follows:
sudo dscl . append /Groups/<group> GroupMembership <username>
I believe the name for the DevTools group is _developer.
Python Pandas iterate over rows and access column names
How to iterate efficiently
If you really have to iterate a Pandas dataframe, you will probably want to avoid using iterrows(). There are different methods and the usual iterrows() is far from being the best. itertuples() can be 100 times faster.
In short:
- As a general rule, use
df.itertuples(name=None). In particular, when you have a fixed number columns and less than 255 columns. See point (3) - Otherwise, use
df.itertuples()except if your columns have special characters such as spaces or '-'. See point (2) - It is possible to use
itertuples()even if your dataframe has strange columns by using the last example. See point (4) - Only use
iterrows()if you cannot the previous solutions. See point (1)
Different methods to iterate over rows in a Pandas dataframe:
Generate a random dataframe with a million rows and 4 columns:
df = pd.DataFrame(np.random.randint(0, 100, size=(1000000, 4)), columns=list('ABCD'))
print(df)
1) The usual iterrows() is convenient, but damn slow:
start_time = time.clock()
result = 0
for _, row in df.iterrows():
result += max(row['B'], row['C'])
total_elapsed_time = round(time.clock() - start_time, 2)
print("1. Iterrows done in {} seconds, result = {}".format(total_elapsed_time, result))
2) The default itertuples() is already much faster, but it doesn't work with column names such as My Col-Name is very Strange (you should avoid this method if your columns are repeated or if a column name cannot be simply converted to a Python variable name).:
start_time = time.clock()
result = 0
for row in df.itertuples(index=False):
result += max(row.B, row.C)
total_elapsed_time = round(time.clock() - start_time, 2)
print("2. Named Itertuples done in {} seconds, result = {}".format(total_elapsed_time, result))
3) The default itertuples() using name=None is even faster but not really convenient as you have to define a variable per column.
start_time = time.clock()
result = 0
for(_, col1, col2, col3, col4) in df.itertuples(name=None):
result += max(col2, col3)
total_elapsed_time = round(time.clock() - start_time, 2)
print("3. Itertuples done in {} seconds, result = {}".format(total_elapsed_time, result))
4) Finally, the named itertuples() is slower than the previous point, but you do not have to define a variable per column and it works with column names such as My Col-Name is very Strange.
start_time = time.clock()
result = 0
for row in df.itertuples(index=False):
result += max(row[df.columns.get_loc('B')], row[df.columns.get_loc('C')])
total_elapsed_time = round(time.clock() - start_time, 2)
print("4. Polyvalent Itertuples working even with special characters in the column name done in {} seconds, result = {}".format(total_elapsed_time, result))
Output:
A B C D
0 41 63 42 23
1 54 9 24 65
2 15 34 10 9
3 39 94 82 97
4 4 88 79 54
... .. .. .. ..
999995 48 27 4 25
999996 16 51 34 28
999997 1 39 61 14
999998 66 51 27 70
999999 51 53 47 99
[1000000 rows x 4 columns]
1. Iterrows done in 104.96 seconds, result = 66151519
2. Named Itertuples done in 1.26 seconds, result = 66151519
3. Itertuples done in 0.94 seconds, result = 66151519
4. Polyvalent Itertuples working even with special characters in the column name done in 2.94 seconds, result = 66151519
This article is a very interesting comparison between iterrows and itertuples
How to force page refreshes or reloads in jQuery?
Or better
window.location.assign("relative or absolute address");
that tends to work best across all browsers and mobile
Best way to store a key=>value array in JavaScript?
You can use Map.
- A new data structure introduced in JavaScript ES6.
- Alternative to JavaScript Object for storing key/value pairs.
- Has useful methods for iteration over the key/value pairs.
var map = new Map();
map.set('name', 'John');
map.set('id', 11);
// Get the full content of the Map
console.log(map); // Map { 'name' => 'John', 'id' => 11 }
Get value of the Map using key
console.log(map.get('name')); // John
console.log(map.get('id')); // 11
Get size of the Map
console.log(map.size); // 2
Check key exists in Map
console.log(map.has('name')); // true
console.log(map.has('age')); // false
Get keys
console.log(map.keys()); // MapIterator { 'name', 'id' }
Get values
console.log(map.values()); // MapIterator { 'John', 11 }
Get elements of the Map
for (let element of map) {
console.log(element);
}
// Output:
// [ 'name', 'John' ]
// [ 'id', 11 ]
Print key value pairs
for (let [key, value] of map) {
console.log(key + " - " + value);
}
// Output:
// name - John
// id - 11
Print only keys of the Map
for (let key of map.keys()) {
console.log(key);
}
// Output:
// name
// id
Print only values of the Map
for (let value of map.values()) {
console.log(value);
}
// Output:
// John
// 11
Why and when to use angular.copy? (Deep Copy)
I would say angular.copy(source); in your situation is unnecessary if later on you do not use is it without a destination angular.copy(source, [destination]);.
If a destination is provided, all of its elements (for arrays) or properties (for objects) are deleted and then all elements/properties from the source are copied to it.
How do I get total physical memory size using PowerShell without WMI?
For those coming here from a later day and age and one a working solution:
(Get-WmiObject -class "cim_physicalmemory" | Measure-Object -Property Capacity -Sum).Sum
this will give the total sum of bytes.
$bytes = (Get-WmiObject -class "cim_physicalmemory" | Measure-Object -Property Capacity -Sum).Sum
$kb = $bytes / 1024
$mb = $bytes / 1024 / 1024
$gb = $bytes / 1024 / 1024 / 1024
I tested this up to windows server 2008 (winver 6.0) even there this command seems to work
How to implement class constants?
All of the replies with readonly are only suitable when this is a pure TS environment - if it's ever being made into a library then this doesn't actually prevent anything, it just provides warnings for the TS compiler itself.
Static is also not correct - that's adding a method to the Class, not to an instance of the class - so you need to address it directly.
There are several ways to manage this, but the pure TS way is to use a getter - exactly as you have done already.
The alternative way is to put it in as readonly, but then use Object.defineProperty to lock it - this is almost the same thing that is being done via the getter, but you can lock it to have a value, rather than a method to use to get it -
class MyClass {
MY_CONSTANT = 10;
constructor() {
Object.defineProperty(this, "MY_CONSTANT", {value: this.MY_CONSTANT});
}
}
The defaults make it read-only, but check out the docs for more details.
Why are only final variables accessible in anonymous class?
Try this code,
Create Array List and put value inside that and return it :
private ArrayList f(Button b, final int a)
{
final ArrayList al = new ArrayList();
b.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
int b = a*5;
al.add(b);
}
});
return al;
}
Could not load file or assembly 'System.Net.Http.Formatting' or one of its dependencies. The system cannot find the path specified
For me it was as simple as
- Delete
Microsoft.AspNet.WebApi.Clientfrom the packages folder in Windows Explorer - Open Tools > NuGet Package Manager > Package Manager Console
- Click the "Restore" button
Attempt to present UIViewController on UIViewController whose view is not in the window hierarchy
Where are you calling this method from? I had an issue where I was attempting to present a modal view controller within the viewDidLoad method. The solution for me was to move this call to the viewDidAppear: method.
My presumption is that the view controller's view is not in the window's view hierarchy at the point that it has been loaded (when the viewDidLoad message is sent), but it is in the window hierarchy after it has been presented (when the viewDidAppear: message is sent).
Caution
If you do make a call to presentViewController:animated:completion: in the viewDidAppear: you may run into an issue whereby the modal view controller is always being presented whenever the view controller's view appears (which makes sense!) and so the modal view controller being presented will never go away...
Maybe this isn't the best place to present the modal view controller, or perhaps some additional state needs to be kept which allows the presenting view controller to decide whether or not it should present the modal view controller immediately.
Left function in c#
It's the Substring method of String, with the first argument set to 0.
myString.Substring(0,1);
[The following was added by Almo; see Justin J Stark's comment. —Peter O.]
Warning:
If the string's length is less than the number of characters you're taking, you'll get an ArgumentOutOfRangeException.
jQuery - prevent default, then continue default
Use jQuery.one()
Attach a handler to an event for the elements. The handler is executed at most once per element per event type
$('form').one('submit', function(e) {
e.preventDefault();
// do your things ...
// and when you done:
$(this).submit();
});
The use of one prevent also infinite loop because this custom submit event is detatched after the first submit.
Max or Default?
Just to let everyone out there know that is using Linq to Entities the methods above will not work...
If you try to do something like
var max = new[]{0}
.Concat((From y In context.MyTable _
Where y.MyField = value _
Select y.MyCounter))
.Max();
It will throw an exception:
System.NotSupportedException: The LINQ expression node type 'NewArrayInit' is not supported in LINQ to Entities..
I would suggest just doing
(From y In context.MyTable _
Where y.MyField = value _
Select y.MyCounter))
.OrderByDescending(x=>x).FirstOrDefault());
And the FirstOrDefault will return 0 if your list is empty.
Change MySQL default character set to UTF-8 in my.cnf?
You can do it the way it does, and if it doesn't work, you need to restart mysql.
How can I add new dimensions to a Numpy array?
You could just create an array of the correct size up-front and fill it:
frames = np.empty((480, 640, 3, 100))
for k in xrange(nframes):
frames[:,:,:,k] = cv2.imread('frame_{}.jpg'.format(k))
if the frames were individual jpg file that were named in some particular way (in the example, frame_0.jpg, frame_1.jpg, etc).
Just a note, you might consider using a (nframes, 480,640,3) shaped array, instead.
How to use multiple LEFT JOINs in SQL?
Yes it is possible. You need one ON for each join table.
LEFT JOIN ab
ON ab.sht = cd.sht
LEFT JOIN aa
ON aa.sht = cd.sht
Incidentally my personal formatting preference for complex SQL is described in http://bentilly.blogspot.com/2011/02/sql-formatting-style.html. If you're going to be writing a lot of this, it likely will help.
Is there a foreach loop in Go?
Go has a foreach-like syntax. It supports arrays/slices, maps and channels.
Iterate over array or slice:
// index and value
for i, v := range slice {}
// index only
for i := range slice {}
// value only
for _, v := range slice {}
Iterate over a map:
// key and value
for key, value := range theMap {}
// key only
for key := range theMap {}
// value only
for _, value := range theMap {}
Iterate over a channel:
for v := range theChan {}
Iterating over a channel is equivalent to receiving from a channel until it is closed:
for {
v, ok := <-theChan
if !ok {
break
}
}
Can I override and overload static methods in Java?
From Why doesn't Java allow overriding of static methods?
Overriding depends on having an instance of a class. The point of polymorphism is that you can subclass a class and the objects implementing those subclasses will have different behaviors for the same methods defined in the superclass (and overridden in the subclasses). A static method is not associated with any instance of a class so the concept is not applicable.
There were two considerations driving Java's design that impacted this. One was a concern with performance: there had been a lot of criticism of Smalltalk about it being too slow (garbage collection and polymorphic calls being part of that) and Java's creators were determined to avoid that. Another was the decision that the target audience for Java was C++ developers. Making static methods work the way they do have the benefit of familiarity for C++ programmers and were also very fast because there's no need to wait until runtime to figure out which method to call.
How do Python functions handle the types of the parameters that you pass in?
The normal, Pythonic, preferred solution is almost invariably "duck typing": try using the argument as if it was of a certain desired type, do it in a try/except statement catching all exceptions that could arise if the argument was not in fact of that type (or any other type nicely duck-mimicking it;-), and in the except clause, try something else (using the argument "as if" it was of some other type).
Read the rest of his post for helpful information.
Image change every 30 seconds - loop
setInterval function is the one that has to be used. Here is an example for the same without any fancy fading option. Simple Javascript that does an image change every 30 seconds. I have assumed that the images were kept in a separate images folder and hence _images/ is present at the beginning of every image. You can have your own path as required to be set.
CODE:
var im = document.getElementById("img");
var images = ["_images/image1.jpg","_images/image2.jpg","_images/image3.jpg"];
var index=0;
function changeImage()
{
im.setAttribute("src", images[index]);
index++;
if(index >= images.length)
{
index=0;
}
}
setInterval(changeImage, 30000);
How to change the timeout on a .NET WebClient object
As Sohnee says, using System.Net.HttpWebRequest and set the Timeout property instead of using System.Net.WebClient.
You can't however set an infinite timeout value (it's not supported and attempting to do so will throw an ArgumentOutOfRangeException).
I'd recommend first performing a HEAD HTTP request and examining the Content-Length header value returned to determine the number of bytes in the file you're downloading and then setting the timeout value accordingly for subsequent GET request or simply specifying a very long timeout value that you would never expect to exceed.
Including one C source file in another?
Including C file into another file is legal, but not advisable thing to do, unless you know exactly why are you doing this and what are you trying to achieve.
I'm almost sure that if you will post here the reason that behind your question the community will find you another more appropriate way to achieve you goal (please note the "almost", since it is possible that this is the solution given the context).
By the way i missed the second part of the question. If C file is included to another file and in the same time included to the project you probably will end up with duplicate symbol problem why linking the objects, i.e same function will be defined twice (unless they all static).
IOS: verify if a point is inside a rect
In Swift that would look like this:
let point = CGPointMake(20,20)
let someFrame = CGRectMake(10,10,100,100)
let isPointInFrame = CGRectContainsPoint(someFrame, point)
Swift 3 version:
let point = CGPointMake(20,20)
let someFrame = CGRectMake(10,10,100,100)
let isPointInFrame = someFrame.contains(point)
Link to documentation . Please remember to check containment if both are in the same coordinate system if not then conversions are required (some example)
How to call code behind server method from a client side JavaScript function?
In my projects, we usually call server side method like this:
in JavaScript:
document.getElementById("UploadButton").click();
Server side control:
<asp:Button runat="server" ID="UploadButton" Text="" style="display:none;" OnClick="UploadButton_Click" />
C#:
protected void Upload_Click(object sender, EventArgs e)
{
}
Get Excel sheet name and use as variable in macro
in a Visual Basic Macro you would use
pName = ActiveWorkbook.Path ' the path of the currently active file
wbName = ActiveWorkbook.Name ' the file name of the currently active file
shtName = ActiveSheet.Name ' the name of the currently selected worksheet
The first sheet in a workbook can be referenced by
ActiveWorkbook.Worksheets(1)
so after deleting the [Report] tab you would use
ActiveWorkbook.Worksheets("Report").Delete
shtName = ActiveWorkbook.Worksheets(1).Name
to "work on that sheet later on" you can create a range object like
Dim MySheet as Range
MySheet = ActiveWorkbook.Worksheets(shtName).[A1]
and continue working on MySheet(rowNum, colNum) etc. ...
shortcut creation of a range object without defining shtName:
Dim MySheet as Range
MySheet = ActiveWorkbook.Worksheets(1).[A1]
Download the Android SDK components for offline install
To install android component do following steps
- Run android sdk manager on offline machine
- Click on show/hide log window
- here youu will find all the list of xml files where packages are available
Fetching https://dl-ssl.google.com/android/repository/addons_list-2.xml
Fetched Add-ons List successfully
Fetching URL: https://dl-ssl.google.com/android/repository/repository-7.xml
Validate XML: https://dl-ssl.google.com/android/repository/repository-7.xml
Parse XML: https://dl-ssl.google.com/android/repository/repository-7.xml
https://dl-ssl.google.com/android/repository/addons_list-2.xml is main xml file where all other package list is available.
lets say you want to download platform api-9 and it is available on repository-7 then you have to do following steps
note the repository address and go to any other machine which has internet connection and type following link in any browser
https://dl-ssl.google.com/android/repository/repository-7.xml
Search for
<sdk:url>**android-2.3.1_r02-linux.zip**</sdk:url>under the api version which you want to download. This is the file name which you have to download. to download this file you have to type following URI in any downloader or browser and it will start download the file.http://dl-ssl.google.com/android/repository/android-2.3.3_r02-linux.zip
General rule for any file replace android-2.3.3_r02-linux.zip with your package name
Once the download is complete,paste downloaded ZIP(or other format for other os) file in your flash/pen drive and paste the zip file at
<android sdk dir>/temp(ex:-c:\android-sdk\temp) folder/directory in your offline machine.Now start the SDK manager and select the package which you have paste in temp and click Install package button. Your package has been installed.
Restart your eclipse and AVD manager to get new packages.
Note:- if you are downloading sdk-tools or sdk platform-tools then choose the package for OS which is on offline machine(windows/Linux/Mac).
How to compile a 32-bit binary on a 64-bit linux machine with gcc/cmake
export CFLAGS=-m32
what is the difference between uint16_t and unsigned short int incase of 64 bit processor?
uint16_t is unsigned 16-bit integer.
unsigned short int is unsigned short integer, but the size is implementation dependent. The standard only says it's at least 16-bit (i.e, minimum value of UINT_MAX is 65535). In practice, it usually is 16-bit, but you can't take that as guaranteed.
Note:
- If you want a portable unsigned 16-bit integer, use
uint16_t. inttypes.handstdint.hare both introduced in C99. If you are using C89, define your own type.uint16_tmay not be provided in certain implementation(See reference below), butunsigned short intis always available.
Reference: C11(ISO/IEC 9899:201x) §7.20 Integer types
For each type described herein that the implementation provides) shall declare that typedef name and define the associated macros. Conversely, for each type described herein that the implementation does not provide, shall not declare that typedef name nor shall it define the associated macros. An implementation shall provide those types described as ‘‘required’’, but need not provide any of the others (described as ‘optional’’).
how to parse json using groovy
That response is a Map, with a single element with key '212315952136472'. There's no 'data' key in the Map. If you want to loop through all entries, use something like this:
JSONObject userJson = JSON.parse(jsonResponse)
userJson.each { id, data -> println data.link }
If you know it's a single-element Map then you can directly access the link:
def data = userJson.values().iterator().next()
String link = data.link
And if you knew the id (e.g. if you used it to make the request) then you can access the value more concisely:
String id = '212315952136472'
...
String link = userJson[id].link
Groovy method with optional parameters
Just a simplification of the Tim's answer. The groovy way to do it is using a map, as already suggested, but then let's put the mandatory parameters also in the map. This will look like this:
def someMethod(def args) {
println "MANDATORY1=${args.mandatory1}"
println "MANDATORY2=${args.mandatory2}"
println "OPTIONAL1=${args?.optional1}"
println "OPTIONAL2=${args?.optional2}"
}
someMethod mandatory1:1, mandatory2:2, optional1:3
with the output:
MANDATORY1=1
MANDATORY2=2
OPTIONAL1=3
OPTIONAL2=null
This looks nicer and the advantage of this is that you can change the order of the parameters as you like.
'Access-Control-Allow-Origin' issue when API call made from React (Isomorphic app)
You can use this code when using vs code on debugging mode.
"runtimeArgs": ["--disable-web-security","--user-data-dir=~/ChromeUserData/"]
launch.json
{
"version": "0.2.0",
"configurations": [
{
"type": "chrome",
"request": "launch",
"name": "Chrome disable-web-security",
"url": "http://localhost:3000",
"webRoot": "${workspaceFolder}",
"runtimeArgs": [
"--disable-web-security",
"--user-data-dir=~/ChromeUserData/"
]
}
]
}
Or directly run
Chrome --disable-web-security --user-data-dir=~/ChromeUserData/
How to verify that a specific method was not called using Mockito?
Both the verifyNoMoreInteractions() and verifyZeroInteractions() method internally have the same implementation as:
public static transient void verifyNoMoreInteractions(Object mocks[])
{
MOCKITO_CORE.verifyNoMoreInteractions(mocks);
}
public static transient void verifyZeroInteractions(Object mocks[])
{
MOCKITO_CORE.verifyNoMoreInteractions(mocks);
}
so we can use any one of them on mock object or array of mock objects to check that no methods have been called using mock objects.
Why, Fatal error: Class 'PHPUnit_Framework_TestCase' not found in ...?
I am using php 5.6 on window 10 with zend 1.12 version for me adding
require_once 'PHPUnit/Autoload.php';
before
abstract class Zend_Test_PHPUnit_ControllerTestCase extends PHPUnit_Framework_TestCase
worked. We need to add this above statement in ControllerTestCase.php file
JSON for List of int
JSON is perfectly capable of expressing lists of integers, and the JSON you have posted is valid. You can simply separate the integers by commas:
{
"Id": "610",
"Name": "15",
"Description": "1.99",
"ItemModList": [42, 47, 139]
}
Understanding Fragment's setRetainInstance(boolean)
setRetaininstance is only useful when your activity is destroyed and recreated due to a configuration change because the instances are saved during a call to onRetainNonConfigurationInstance. That is, if you rotate the device, the retained fragments will remain there(they're not destroyed and recreated.) but when the runtime kills the activity to reclaim resources, nothing is left. When you press back button and exit the activity, everything is destroyed.
Usually I use this function to saved orientation changing Time.Say I have download a bunch of Bitmaps from server and each one is 1MB, when the user accidentally rotate his device, I certainly don't want to do all the download work again.So I create a Fragment holding my bitmaps and add it to the manager and call setRetainInstance,all the Bitmaps are still there even if the screen orientation changes.
What is the use of the init() usage in JavaScript?
JavaScript doesn't have a built-in init() function, that is, it's not a part of the language. But it's not uncommon (in a lot of languages) for individual programmers to create their own init() function for initialisation stuff.
A particular init() function may be used to initialise the whole webpage, in which case it would probably be called from document.ready or onload processing, or it may be to initialise a particular type of object, or...well, you name it.
What any given init() does specifically is really up to whatever the person who wrote it needed it to do. Some types of code don't need any initialisation.
function init() {
// initialisation stuff here
}
// elsewhere in code
init();
Removing all non-numeric characters from string in Python
>>> import re
>>> re.sub("[^0-9]", "", "sdkjh987978asd098as0980a98sd")
'987978098098098'
Python CSV error: line contains NULL byte
One case is that - If the CSV file contains empty rows this error may show up. Check for row is necessary before we proceed to write or read.
for row in csvreader:
if (row):
do something
I solved my issue by adding this check in the code.
jQuery datepicker to prevent past date
//disable future dates
$('#datetimepicker1').datetimepicker({
format: 'DD-MM-YYYY',
maxDate: new Date
});
//disable past dates
$('#datetimepicker2').datetimepicker({
format: 'DD-MM-YYYY',
minDate: new Date
});
how to count the spaces in a java string?
public static void main(String[] args) {
String str = "Honey dfd tEch Solution";
String[] arr = str.split(" ");
System.out.println(arr.length);
int count = 0;
for (int i = 0; i < arr.length; i++) {
if (!arr[i].trim().isEmpty()) {
System.out.println(arr[i]);
count++;
}
}
System.out.println(count);
}
offsetting an html anchor to adjust for fixed header
You can do it without js and without altering html. It´s css-only.
a[id]::before {
content: '';
display: block;
height: 50px;
margin: -30px 0 0;
}
That will append a pseudo-element before every a-tag with an id. Adjust values to match the height of your header.
Referencing Row Number in R
These are present by default as rownames when you create a data.frame.
R> df = data.frame('a' = rnorm(10), 'b' = runif(10), 'c' = letters[1:10])
R> df
a b c
1 0.3336944 0.39746731 a
2 -0.2334404 0.12242856 b
3 1.4886706 0.07984085 c
4 -1.4853724 0.83163342 d
5 0.7291344 0.10981827 e
6 0.1786753 0.47401690 f
7 -0.9173701 0.73992239 g
8 0.7805941 0.91925413 h
9 0.2469860 0.87979229 i
10 1.2810961 0.53289335 j
and you can access them via the rownames command.
R> rownames(df)
[1] "1" "2" "3" "4" "5" "6" "7" "8" "9" "10"
if you need them as numbers, simply coerce to numeric by adding as.numeric, as in as.numeric(rownames(df)).
You don't need to add them, as if you know what you are looking for (say item df$c == 'i', you can use the which command:
R> which(df$c =='i')
[1] 9
or if you don't know the column
R> which(df == 'i', arr.ind=T)
row col
[1,] 9 3
you may access the element using df[9, 'c'], or df$c[9].
If you wanted to add them you could use df$rownumber <- as.numeric(rownames(df)), though this may be less robust than df$rownumber <- 1:nrow(df) as there are cases when you might have assigned to rownames so they will no longer be the default index numbers (the which command will continue to return index numbers even if you do assign to rownames).
How to activate JMX on my JVM for access with jconsole?
Running in a Docker container introduced a whole slew of additional problems for connecting so hopefully this helps someone. I ended up needed to add the following options which I'll explain below:
-Dcom.sun.management.jmxremote=true
-Dcom.sun.management.jmxremote.local.only=false
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.ssl=false
-Djava.rmi.server.hostname=${DOCKER_HOST_IP}
-Dcom.sun.management.jmxremote.port=9999
-Dcom.sun.management.jmxremote.rmi.port=9998
DOCKER_HOST_IP
Unlike using jconsole locally, you have to advertise a different IP than you'll probably see from within the container. You'll need to replace ${DOCKER_HOST_IP} with the externally resolvable IP (DNS Name) of your Docker host.
JMX Remote & RMI Ports
It looks like JMX also requires access to a remote management interface (jstat) that uses a different port to transfer some data when arbitrating the connection. I didn't see anywhere immediately obvious in jconsole to set this value. In the linked article the process was:
- Try and connect from
jconsolewith logging enabled - Fail
- Figure out which port
jconsoleattempted to use - Use
iptables/firewallrules as necessary to allow that port to connect
While that works, it's certainly not an automatable solution. I opted for an upgrade from jconsole to VisualVM since it let's you to explicitly specify the port on which jstatd is running. In VisualVM, add a New Remote Host and update it with values that correlate to the ones specified above:
Then right-click the new Remote Host Connection and Add JMX Connection...
Don't forget to check the checkbox for Do not require SSL connection. Hopefully, that should allow you to connect.
RecyclerView: Inconsistency detected. Invalid item position
For fix this issue just call notifyDataSetChanged() with empty list before updating recycle view.
For example
//Method for refresh recycle view
if (!hcpArray.isEmpty())
hcpArray.clear();//The list for update recycle view
adapter.notifyDataSetChanged();
How to update record using Entity Framework Core?
According to Microsoft docs:
the read-first approach requires an extra database read, and can result in more complex code for handling concurrency conflict
However, you should know that using Update method on DbContext will mark all the fields as modified and will include all of them in the query. If you want to update a subset of fields you should use the Attach method and then mark the desired field as modified manually.
context.Attach(person);
context.Entry(person).Property(p => p.Name).IsModified = true;
context.SaveChanges();
How to use putExtra() and getExtra() for string data
first Screen.java
text=(TextView)findViewById(R.id.tv1);
edit=(EditText)findViewById(R.id.edit);
button=(Button)findViewById(R.id.bt1);
button.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
String s=edit.getText().toString();
Intent ii=new Intent(MainActivity.this, newclass.class);
ii.putExtra("name", s);
startActivity(ii);
}
});
Second Screen.java
public class newclass extends Activity
{
private TextView Textv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.intent);
Textv = (TextView)findViewById(R.id.tv2);
Intent iin= getIntent();
Bundle b = iin.getExtras();
if(b!=null)
{
String j =(String) b.get("name");
Textv.setText(j);
}
}
}
How to change the color of text in javafx TextField?
If you are designing your Javafx application using SceneBuilder then use -fx-text-fill(if not available as option then write it in style input box) as style and give the color you want,it will change the text color of your Textfield.
I came here for the same problem and solved it in this way.
Selenium C# WebDriver: Wait until element is present
public bool doesWebElementExist(string linkexist)
{
try
{
driver.FindElement(By.XPath(linkexist));
return true;
}
catch (NoSuchElementException e)
{
return false;
}
}
How can I compare two strings in java and define which of them is smaller than the other alphabetically?
If you would like to ignore case you could use the following:
String s = "yip";
String best = "yodel";
int compare = s.compareToIgnoreCase(best);
if(compare < 0){
//-1, --> s is less than best. ( s comes alphabetically first)
}
else if(compare > 0 ){
// best comes alphabetically first.
}
else{
// strings are equal.
}