Bad operand type for unary +: 'str'

You say that if int(splitLine[0]) > int(lastUnix): is causing the trouble, but you don't actually show anything which suggests that. I think this line is the problem instead:

print 'Pulled', + stock

Do you see why this line could cause that error message? You want either

>>> stock = "AAAA"
>>> print 'Pulled', stock
Pulled AAAA

>>> print 'Pulled ' + stock
Pulled AAAA

not

>>> print 'Pulled', + stock
PulledTraceback (most recent call last):
  File "<ipython-input-5-7c26bb268609>", line 1, in <module>
    print 'Pulled', + stock
TypeError: bad operand type for unary +: 'str'

You're asking Python to apply the + symbol to a string like +23 makes a positive 23, and she's objecting.

TypeError: unsupported operand type(s) for -: 'list' and 'list'

The operations needed to be performed, require numpy arrays either created via

np.array()

or can be converted from list to an array via

np.stack()

As in the above mentioned case, 2 lists are inputted as operands it triggers the error.

Docker is installed but Docker Compose is not ? why?

just use brew:

brew install docker-compose

XPath - Selecting elements that equal a value

The XPath spec. defines the string value of an element as the concatenation (in document order) of all of its text-node descendents.

This explains the "strange results".

"Better" results can be obtained using the expressions below:

//*[text() = 'qwerty']

The above selects every element in the document that has at least one text-node child with value 'qwerty'.

//*[text() = 'qwerty' and not(text()[2])]

The above selects every element in the document that has only one text-node child and its value is: 'qwerty'.

How to get the device's IMEI/ESN programmatically in android?

Or you can use the ANDROID_ID setting from Android.Provider.Settings.System (as described here strazerre.com).

This has the advantage that it doesn't require special permissions but can change if another application has write access and changes it (which is apparently unusual but not impossible).

Just for reference here is the code from the blog:

import android.provider.Settings;
import android.provider.Settings.System;   

String androidID = System.getString(this.getContentResolver(),Secure.ANDROID_ID);

Implementation note: if the ID is critical to the system architecture you need to be aware that in practice some of the very low end Android phones & tablets have been found reusing the same ANDROID_ID (9774d56d682e549c was the value showing up in our logs)

PHP checkbox set to check based on database value

Extract the information from the database for the checkbox fields. Next change the above example line to: (this code assumes that you've retrieved the information for the user into an associative array called dbvalue and the DB field names match those on the HTML form)

<input type="checkbox" name="tag_1" id="tag_1" value="yes" <?php echo ($dbvalue['tag_1']==1 ? 'checked' : '');?>>

If you're looking for the code to do everything for you, you've come to the wrong place.

AngularJS Multiple ng-app within a page

You can define a Root ng-App and in this ng-App you can define multiple nd-Controler. Like this

    <!DOCTYPE html>
    <html>
    <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.3.3/angular.min.js"></script>

<style>
         table, th , td {
            border: 1px solid grey;
            border-collapse: collapse;
            padding: 5px;
         }

         table tr:nth-child(odd) {
            background-color: #f2f2f2;
         }

         table tr:nth-child(even) {
            background-color: #ffffff;
         }
      </style>

     <script>
      var mainApp = angular.module("mainApp", []);

      mainApp.controller('studentController1', function ($scope) {
      $scope.student = {
      firstName: "MUKESH",
      lastName: "Paswan",

      fullName: function () {
         var studentObject;
         studentObject = $scope.student;
         return studentObject.firstName + " " + studentObject.lastName;
                     }
                 };
             });

             mainApp.controller('studentController2', function ($scope) {
                 $scope.student = {
                     firstName: "Mahesh",
                     lastName: "Parashar",
                     fees: 500,

                     subjects: [
                        { name: 'Physics', marks: 70 },
                        { name: 'Chemistry', marks: 80 },
                        { name: 'Math', marks: 65 },
                        { name: 'English', marks: 75 },
                        { name: 'Hindi', marks: 67 }
                     ],

                     fullName: function () {
                         var studentObject;
                         studentObject = $scope.student;
                         return studentObject.firstName + " " + studentObject.lastName;
                     }
                 };
             });
          </script>

    <body>
    <div ng-app = "mainApp">
    <div id="dv1"  ng-controller = "studentController1">
    Enter first name: <input type = "text" ng-model = "student.firstName"><br/><br/> Enter last name: <input type = "text" ng-model = "student.lastName"><br/>
    <br/>
     You are entering: {{student.fullName()}}
    </div>

    <div id="dv2" ng-controller = "studentController2">
     <table border = "0">
                <tr>
                   <td>Enter first name:</td>
                   <td><input type = "text" ng-model = "student.firstName"></td>
                </tr>

                <tr>
                   <td>Enter last name: </td>
                   <td>
                      <input type = "text" ng-model = "student.lastName">
                   </td>
                </tr>

                <tr>
                   <td>Name: </td>
                   <td>{{student.fullName()}}</td>
                </tr>

                <tr>
                   <td>Subject:</td>

                   <td>
                      <table>
                         <tr>
                            <th>Name</th>.
                            <th>Marks</th>
                         </tr>

                         <tr ng-repeat = "subject in student.subjects">
                            <td>{{ subject.name }}</td>
                            <td>{{ subject.marks }}</td>
                         </tr>

                      </table>
                   </td>

                </tr>
             </table>

          </div>
    </div>

    </body>
    </html>

figure of imshow() is too small

That's strange, it definitely works for me:

from matplotlib import pyplot as plt

plt.figure(figsize = (20,2))
plt.imshow(random.rand(8, 90), interpolation='nearest')

I am using the "MacOSX" backend, btw.

Convert a CERT/PEM certificate to a PFX certificate

openssl pkcs12 -inkey bob_key.pem -in bob_cert.cert -export -out bob_pfx.pfx

Creating a generic method in C#

What if you specified the default value to return, instead of using default(T)?

public static T GetQueryString<T>(string key, T defaultValue) {...}

It makes calling it easier too:

var intValue = GetQueryString("intParm", Int32.MinValue);
var strValue = GetQueryString("strParm", "");
var dtmValue = GetQueryString("dtmPatm", DateTime.Now); // eg use today's date if not specified

The downside being you need magic values to denote invalid/missing querystring values.

How can I make setInterval also work when a tab is inactive in Chrome?

For me it's not important to play audio in the background like for others here, my problem was that I had some animations and they acted like crazy when you were in other tabs and coming back to them. My solution was putting these animations inside if that is preventing inactive tab:

if (!document.hidden){ //your animation code here }

thanks to that my animation was running only if tab was active. I hope this will help someone with my case.

How to "inverse match" with regex?

Negative lookahead assertion

(?!Andrea)

This is not exactly an inverted match, but it's the best you can directly do with regex. Not all platforms support them though.

C - error: storage size of ‘a’ isn’t known

In this case the user has done mistake in definition and its usage. If someone has done a typedef to a structure the same should be used without using struct following is the example.

typedef struct
{
   int a;
}studyT;

When using in a function

int main()
{
   struct studyT study; // This will give above error.
   studyT stud; // This will eliminate the above error.
   return 0;
}

How to enable NSZombie in Xcode?

NSZombieEnabled is used for Debugging BAD_ACCESS,

enable the NSZombiesEnabled environment variable from Xcode’s schemes sheet.

Click on Product?Edit Scheme to open the sheet and set the Enable Zombie Objects check box

this video will help you to see what i'm trying to say.

How should I throw a divide by zero exception in Java without actually dividing by zero?

public class ZeroDivisionException extends ArithmeticException {
    // ...
}

if (denominator == 0) {
    throw new ZeroDivisionException();
}

set height of imageview as matchparent programmatically

imageView.getLayoutParams().height= ViewGroup.LayoutParams.MATCH_PARENT;

New to unit testing, how to write great tests?

Don't write tests to get full coverage of your code. Write tests that guarantee your requirements. You may discover codepaths that are unnecessary. Conversely, if they are necessary, they are there to fulfill some kind of requirement; find it what it is and test the requirement (not the path).

Keep your tests small: one test per requirement.

Later, when you need to make a change (or write new code), try writing one test first. Just one. Then you'll have taken the first step in test-driven development.

ipynb import another ipynb file

There is no problem at all using Jupyter with existing or new Python .py modules. With Jupyter running, simply fire up Spyder (or any editor of your choice) to build / modify your module class definitions in a .py file, and then just import the modules as needed into Jupyter.

One thing that makes this really seamless is using the autoreload magic extension. You can see documentation for autoreload here:

http://ipython.readthedocs.io/en/stable/config/extensions/autoreload.html

Here is the code to automatically reload the module any time it has been modified:

# autoreload sets up auto reloading of modified .py modules
import autoreload
%load_ext autoreload
%autoreload 2

Note that I tried the code mentioned in a prior reply to simulate loading .ipynb files as modules, and got it to work, but it chokes when you make changes to the .ipynb file. It looks like you need to restart the Jupyter development environment in order to reload the .ipynb 'module', which was not acceptable to me since I am making lots of changes to my code.

Word wrap for a label in Windows Forms

The quick answer: switch off AutoSize.

The big problem here is that the label will not change its height automatically (only width). To get this right you will need to subclass the label and include vertical resize logic.

Basically what you need to do in OnPaint is:

Measure the height of the text (Graphics.MeasureString).
If the label height is not equal to the height of the text set the height and return.
Draw the text.

You will also need to set the ResizeRedraw style flag in the constructor.

Hide horizontal scrollbar on an iframe?

set scrolling="no" attribute in your iframe.

Is it possible to set a timeout for an SQL query on Microsoft SQL server?

enter image description here

You can set Execution time-out in seconds.

(change) vs (ngModelChange) in angular

In Angular 7, the (ngModelChange)="eventHandler()" will fire before the value bound to [(ngModel)]="value" is changed while the (change)="eventHandler()" will fire after the value bound to [(ngModel)]="value" is changed.

ExecuteNonQuery: Connection property has not been initialized.

double click on your form to create form_load event.Then inside that event write command.connection = "your connection name";

Executable directory where application is running from?

Dim P As String = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().CodeBase)
P = New Uri(P).LocalPath

How to use/install gcc on Mac OS X 10.8 / Xcode 4.4

Adding 'serial' to existing column in Postgres

TL;DR

Here's a version where you don't need a human to read a value and type it out themselves.

CREATE SEQUENCE foo_a_seq OWNED BY foo.a;
SELECT setval('foo_a_seq', coalesce(max(a), 0) + 1, false) FROM foo;
ALTER TABLE foo ALTER COLUMN a SET DEFAULT nextval('foo_a_seq');

Another option would be to employ the reusable Function shared at the end of this answer.

A non-interactive solution

Just adding to the other two answers, for those of us who need to have these Sequences created by a non-interactive script, while patching a live-ish DB for instance.

That is, when you don't wanna SELECT the value manually and type it yourself into a subsequent CREATE statement.

In short, you can not do:

CREATE SEQUENCE foo_a_seq
    START WITH ( SELECT max(a) + 1 FROM foo );

... since the START [WITH] clause in CREATE SEQUENCE expects a value, not a subquery.

Note: As a rule of thumb, that applies to all non-CRUD (i.e.: anything other than INSERT, SELECT, UPDATE, DELETE) statements in pgSQL AFAIK.

However, setval() does! Thus, the following is absolutely fine:

SELECT setval('foo_a_seq', max(a)) FROM foo;

If there's no data and you don't (want to) know about it, use coalesce() to set the default value:

SELECT setval('foo_a_seq', coalesce(max(a), 0)) FROM foo;
--                         ^      ^         ^
--                       defaults to:       0

However, having the current sequence value set to 0 is clumsy, if not illegal.
Using the three-parameter form of setval would be more appropriate:

--                                             vvv
SELECT setval('foo_a_seq', coalesce(max(a), 0) + 1, false) FROM foo;
--                                                  ^   ^
--                                                is_called

Setting the optional third parameter of setval to false will prevent the next nextval from advancing the sequence before returning a value, and thus:

the next nextval will return exactly the specified value, and sequence advancement commences with the following nextval.

— from this entry in the documentation

On an unrelated note, you also can specify the column owning the Sequence directly with CREATE, you don't have to alter it later:

CREATE SEQUENCE foo_a_seq OWNED BY foo.a;

In summary:

CREATE SEQUENCE foo_a_seq OWNED BY foo.a;
SELECT setval('foo_a_seq', coalesce(max(a), 0) + 1, false) FROM foo;
ALTER TABLE foo ALTER COLUMN a SET DEFAULT nextval('foo_a_seq');

Using a `Function`

Alternatively, if you're planning on doing this for multiple columns, you could opt for using an actual Function.

CREATE OR REPLACE FUNCTION make_into_serial(table_name TEXT, column_name TEXT) RETURNS INTEGER AS $$
DECLARE
    start_with INTEGER;
    sequence_name TEXT;
BEGIN
    sequence_name := table_name || '_' || column_name || '_seq';
    EXECUTE 'SELECT coalesce(max(' || column_name || '), 0) + 1 FROM ' || table_name
            INTO start_with;
    EXECUTE 'CREATE SEQUENCE ' || sequence_name ||
            ' START WITH ' || start_with ||
            ' OWNED BY ' || table_name || '.' || column_name;
    EXECUTE 'ALTER TABLE ' || table_name || ' ALTER COLUMN ' || column_name ||
            ' SET DEFAULT nextVal(''' || sequence_name || ''')';
    RETURN start_with;
END;
$$ LANGUAGE plpgsql VOLATILE;

Use it like so:

INSERT INTO foo (data) VALUES ('asdf');
-- ERROR: null value in column "a" violates not-null constraint

SELECT make_into_serial('foo', 'a');
INSERT INTO foo (data) VALUES ('asdf');
-- OK: 1 row(s) affected

In jQuery, how do I get the value of a radio button when they all have the same name?

use this script

$('input[name=q12_3]').is(":checked");

Incomplete type is not allowed: stringstream

Some of the system headers provide a forward declaration of std::stringstream without the definition. This makes it an 'incomplete type'. To fix that you need to include the definition, which is provided in the <sstream> header:

#include <sstream>

SQL Server Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >=

I had the same problem , I used in instead of = , from the Northwind database example :

Query is : Find the Companies that placed orders in 1997

Try this :

SELECT CompanyName
    FROM Customers
WHERE CustomerID IN (
                        SELECT CustomerID 
                            FROM Orders 
                        WHERE YEAR(OrderDate) = '1997'
                    );

Instead of that :

SELECT CompanyName
    FROM Customers
WHERE CustomerID =
(
    SELECT CustomerID 
        FROM Orders 
    WHERE YEAR(OrderDate) = '1997'
);

How to center align the cells of a UICollectionView?

Based on user3676011 answer, I can suggest more detailed one with small correction. This solution works great on Swift 2.0.

enum CollectionViewContentPosition {
    case Left
    case Center
}

var collectionViewContentPosition: CollectionViewContentPosition = .Left

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout,
    insetForSectionAtIndex section: Int) -> UIEdgeInsets {

    if collectionViewContentPosition == .Left {
        return UIEdgeInsetsZero
    }

    // Center collectionView content

    let itemsCount: CGFloat = CGFloat(collectionView.numberOfItemsInSection(section))
    let collectionViewWidth: CGFloat = collectionView.bounds.width

    let itemWidth: CGFloat = 40.0
    let itemsMargin: CGFloat = 10.0

    let edgeInsets = (collectionViewWidth - (itemsCount * itemWidth) - ((itemsCount-1) * itemsMargin)) / 2

    return UIEdgeInsetsMake(0, edgeInsets, 0, 0)
}

There was an issue in

(CGFloat(elements.count) * 10))

where should be additional -1 mentioned.

Using `date` command to get previous, current and next month

the following will do:

date -d "$(date +%Y-%m-1) -1 month" +%-m
date -d "$(date +%Y-%m-1) 0 month" +%-m
date -d "$(date +%Y-%m-1) 1 month" +%-m

or as you need:

LAST_MONTH=`date -d "$(date +%Y-%m-1) -1 month" +%-m`
NEXT_MONTH=`date -d "$(date +%Y-%m-1) 1 month" +%-m`
THIS_MONTH=`date -d "$(date +%Y-%m-1) 0 month" +%-m`

you asked for output like 9,10,11, so I used the %-m

%m (without -) will produce output like 09,... (leading zero)

this also works for more/less than 12 months:

date -d "$(date +%Y-%m-1) -13 month" +%-m

just try

date -d "$(date +%Y-%m-1) -13 month"

to see full result

How to check cordova android version of a cordova/phonegap project?

The file platforms/platforms.json lists all of the platform versions.

Shall we always use [unowned self] inside closure in Swift

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.

        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let controller = storyboard.instantiateViewController(withIdentifier: "AnotherViewController")
        self.navigationController?.pushViewController(controller, animated: true)

    }

}



import UIKit
class AnotherViewController: UIViewController {

    var name : String!

    deinit {
        print("Deint AnotherViewController")
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        print(CFGetRetainCount(self))

        /*
            When you test please comment out or vice versa

         */

//        // Should not use unowned here. Because unowned is used where not deallocated. or gurranted object alive. If you immediate click back button app will crash here. Though there will no retain cycles
//        clouser(string: "") { [unowned self] (boolValue)  in
//            self.name = "some"
//        }
//


//
//        // There will be a retain cycle. because viewcontroller has a strong refference to this clouser and as well as clouser (self.name) has a strong refferennce to the viewcontroller. Deint AnotherViewController will not print
//        clouser(string: "") { (boolValue)  in
//            self.name = "some"
//        }
//
//


//        // no retain cycle here. because viewcontroller has a strong refference to this clouser. But clouser (self.name) has a weak refferennce to the viewcontroller. Deint AnotherViewController will  print. As we forcefully made viewcontroller weak so its now optional type. migh be nil. and we added a ? (self?)
//
//        clouser(string: "") { [weak self] (boolValue)  in
//            self?.name = "some"
//        }


        // no retain cycle here. because viewcontroller has a strong refference to this clouser. But clouser nos refference to the viewcontroller. Deint AnotherViewController will  print. As we forcefully made viewcontroller weak so its now optional type. migh be nil. and we added a ? (self?)

        clouser(string: "") {  (boolValue)  in
            print("some")
            print(CFGetRetainCount(self))

        }

    }


    func clouser(string: String, completion: @escaping (Bool) -> ()) {
        // some heavy task
        DispatchQueue.main.asyncAfter(deadline: .now() + 5.0) {
            completion(true)
        }

    }

}

If you do not sure about [unowned self] then use [weak self]

PHP Fatal Error Failed opening required File

It's not actually an Apache related question. Nor even a PHP related one. To understand this error you have to distinguish a path on the virtual server from a path in the filesystem.

require operator works with files. But a path like this

                          /common/configs/config_templates.inc.php

only exists on the virtual HTTP server, while there is no such path in the filesystem. The correct filesystem path would be

/home/viapics1/public_html/common/configs/config_templates.inc.php

where

/home/viapics1/public_html

part is called the Document root and it connects the virtual world with the real one. Luckily, web-servers usually have the document root in a configuration variable that they share with PHP. So if you change your code to something like this

require_once $_SERVER['DOCUMENT_ROOT'].'/common/configs/config_templates.inc.php';

it will work from any file placed in any directory!

Update: eventually I wrote an article that explains the difference between relative and absolute paths, in the file system and on the web server, which explains the matter in detail, and contains some practical solutions. Like, such a handy variable doesn't exist when you run your script from a command line. In this case a technique called "a single entry point" is to the rescue. You may refer to the article above for the details as well.

How to include jQuery in ASP.Net project?

if you build an MVC project, its included by default. otherwise, what Nick said.

MySQL Alter Table Add Field Before or After a field already present

$query = "ALTER TABLE `" . $table_prefix . "posts_to_bookmark` 
          ADD COLUMN `ping_status` INT(1) NOT NULL 
          AFTER `<TABLE COLUMN BEFORE THIS COLUMN>`";

I believe you need to have ADD COLUMN and use AFTER, not BEFORE.

In case you want to place column at the beginning of a table, use the FIRST statement:

$query = "ALTER TABLE `" . $table_prefix . "posts_to_bookmark`
          ADD COLUMN `ping_status` INT(1) NOT NULL 
          FIRST";

http://dev.mysql.com/doc/refman/5.1/en/alter-table.html

How can I tell jaxb / Maven to generate multiple schema packages?

You can use also JAXB bindings to specify different package for each schema, e.g.

<jaxb:bindings xmlns:jaxb="http://java.sun.com/xml/ns/jaxb" xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc"
    xmlns:xs="http://www.w3.org/2001/XMLSchema" version="2.0" schemaLocation="book.xsd">

    <jaxb:globalBindings>
        <xjc:serializable uid="1" />
    </jaxb:globalBindings>

    <jaxb:schemaBindings>
        <jaxb:package name="com.stackoverflow.book" />
    </jaxb:schemaBindings>

</jaxb:bindings>

Then just use the new maven-jaxb2-plugin 0.8.0 <schemas> and <bindings> elements in the pom.xml. Or specify the top most directory in <schemaDirectory> and <bindingDirectory> and by <include> your schemas and bindings:

<schemaDirectory>src/main/resources/xsd</schemaDirectory>
<schemaIncludes>
    <include>book/*.xsd</include>
    <include>person/*.xsd</include>
</schemaIncludes>
<bindingDirectory>src/main/resources</bindingDirectory>
<bindingIncludes>
    <include>book/*.xjb</include>
    <include>person/*.xjb</include>
</bindingIncludes>

I think this is more convenient solution, because when you add a new XSD you do not need to change Maven pom.xml, just add a new XJB binding file to the same directory.

How to make a copy of a file in android?

Plot data in descending order as appears in data frame

You want reorder(). Here is an example with dummy data

set.seed(42)
df <- data.frame(Category = sample(LETTERS), Count = rpois(26, 6))

require("ggplot2")

p1 <- ggplot(df, aes(x = Category, y = Count)) +
         geom_bar(stat = "identity")

p2 <- ggplot(df, aes(x = reorder(Category, -Count), y = Count)) +
         geom_bar(stat = "identity")

require("gridExtra")
grid.arrange(arrangeGrob(p1, p2))

Giving:

enter image description here

Use reorder(Category, Count) to have Category ordered from low-high.

Batch command date and time in file name

From the answer above, I have made a ready-to-use function.

Validated with french local settings.

:::::::: PROGRAM ::::::::::

call:genname "my file 1.txt"
echo "%newname%"
call:genname "my file 2.doc"
echo "%newname%"

echo.&pause&goto:eof
:::::::: FUNCTIONS :::::::::

:genname
    set d1=%date:~-4,4%
    set d2=%date:~-10,2%
    set d3=%date:~-7,2%
    set t1=%time:~0,2%
    ::if "%t1:~0,1%" equ " " set t1=0%t1:~1,1%
    set t1=%t1: =0%
    set t2=%time:~3,2%
    set t3=%time:~6,2%
    set filename=%~1
    set newname=%d1%%d2%%d3%_%t1%%t2%%t3%-%filename%
goto:eof

Split String into an array of String

String[] result = "hi i'm paul".split("\\s+"); to split across one or more cases.

Or you could take a look at Apache Common StringUtils. It has StringUtils.split(String str) method that splits string using white space as delimiter. It also has other useful utility methods

Error: Local workspace file ('angular.json') could not be found

Check out this link to migrate from Angular 5.2 to 6. https://update.angular.io/

Upgrading to version 8.9 worked for me.

Can I style an image's ALT text with CSS?

You can use img[alt] {styles} to style only the alternative text.

DB2 Date format

SELECT VARCHAR_FORMAT(CURRENT TIMESTAMP, 'YYYYMMDD')
FROM SYSIBM.SYSDUMMY1

Should work on both Mainframe and Linux/Unix/Windows DB2. Info Center entry for VARCHAR_FORMAT().

Raise error in a Bash script

You have 2 options: Redirect the output of the script to a file, Introduce a log file in the script and

Redirecting output to a file:

Here you assume that the script outputs all necessary info, including warning and error messages. You can then redirect the output to a file of your choice.

./runTests &> output.log

The above command redirects both the standard output and the error output to your log file.

Using this approach you don't have to introduce a log file in the script, and so the logic is a tiny bit easier.

Introduce a log file to the script:

In your script add a log file either by hard coding it:

logFile='./path/to/log/file.log'

or passing it by a parameter:

logFile="${1}"  # This assumes the first parameter to the script is the log file

It's a good idea to add the timestamp at the time of execution to the log file at the top of the script:

date '+%Y%-m%d-%H%M%S' >> "${logFile}"

You can then redirect your error messages to the log file

if [ condition ]; then
    echo "Test cases failed!!" >> "${logFile}"; 
fi

This will append the error to the log file and continue execution. If you want to stop execution when critical errors occur, you can exit the script:

if [ condition ]; then
    echo "Test cases failed!!" >> "${logFile}"; 
    # Clean up if needed
    exit 1;
fi

Note that exit 1 indicates that the program stop execution due to an unspecified error. You can customize this if you like.

Using this approach you can customize your logs and have a different log file for each component of your script.

If you have a relatively small script or want to execute somebody else's script without modifying it to the first approach is more suitable.

If you always want the log file to be at the same location, this is the better option of the 2. Also if you have created a big script with multiple components then you may want to log each part differently and the second approach is your only option.

Remove leading and trailing spaces?

Expand your one liner into multiple lines. Then it becomes easy:

f.write(re.split("Tech ID:|Name:|Account #:",line)[-1])

parts = re.split("Tech ID:|Name:|Account #:",line)
wanted_part = parts[-1]
wanted_part_stripped = wanted_part.strip()
f.write(wanted_part_stripped)

Trigger standard HTML5 validation (form) without using submit button?

As stated in the other answers use event.preventDefault() to prevent form submitting.

To check the form before I wrote a little jQuery function you may use (note that the element needs an ID!)

(function( $ ){
    $.fn.isValid = function() {
        return document.getElementById(this[0].id).checkValidity();
    };
})( jQuery );

example usage

 $('#submitBtn').click( function(e){

        if ($('#registerForm').isValid()){
            // do the request
        } else {
            e.preventDefault();
        }
    });

How to check if user input is not an int value

Try this one:

    for (;;) {
        if (!sc.hasNextInt()) {
            System.out.println(" enter only integers!: ");
            sc.next(); // discard
            continue;
        }
        choose = sc.nextInt();
        if (choose >= 0) {
            System.out.print("no problem with input");

        } else {
            System.out.print("invalid inputs");

        }
    break;
  }

How to correctly link php-fpm and Nginx Docker containers?

New Answer

Docker Compose has been updated. They now have a version 2 file format.

Version 2 files are supported by Compose 1.6.0+ and require a Docker Engine of version 1.10.0+.

They now support the networking feature of Docker which when run sets up a default network called myapp_default

From their documentation your file would look something like the below:

version: '2'

services:
  web:
    build: .
    ports:
      - "8000:8000"
  fpm:
    image: phpfpm
  nginx
    image: nginx

As these containers are automatically added to the default myapp_default network they would be able to talk to each other. You would then have in the Nginx config:

fastcgi_pass fpm:9000;

Also as mentioned by @treeface in the comments remember to ensure PHP-FPM is listening on port 9000, this can be done by editing /etc/php5/fpm/pool.d/www.conf where you will need listen = 9000.

Old Answer

I have kept the below here for those using older version of Docker/Docker compose and would like the information.

I kept stumbling upon this question on google when trying to find an answer to this question but it was not quite what I was looking for due to the Q/A emphasis on docker-compose (which at the time of writing only has experimental support for docker networking features). So here is my take on what I have learnt.

Docker has recently deprecated its link feature in favour of its networks feature

Therefore using the Docker Networks feature you can link containers by following these steps. For full explanations on options read up on the docs linked previously.

First create your network

docker network create --driver bridge mynetwork

Next run your PHP-FPM container ensuring you open up port 9000 and assign to your new network (mynetwork).

docker run -d -p 9000 --net mynetwork --name php-fpm php:fpm

The important bit here is the --name php-fpm at the end of the command which is the name, we will need this later.

Next run your Nginx container again assign to the network you created.

docker run --net mynetwork --name nginx -d -p 80:80 nginx:latest

For the PHP and Nginx containers you can also add in --volumes-from commands etc as required.

Now comes the Nginx configuration. Which should look something similar to this:

server {
    listen 80;
    server_name localhost;

    root /path/to/my/webroot;

    index index.html index.htm index.php;

    location / {
        try_files $uri $uri/ /index.php?$query_string;
    }

    location ~ \.php$ {
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass php-fpm:9000; 
        fastcgi_index index.php;
        include fastcgi_params;
    }
}

Notice the fastcgi_pass php-fpm:9000; in the location block. Thats saying contact container php-fpm on port 9000. When you add containers to a Docker bridge network they all automatically get a hosts file update which puts in their container name against their IP address. So when Nginx sees that it will know to contact the PHP-FPM container you named php-fpm earlier and assigned to your mynetwork Docker network.

You can add that Nginx config either during the build process of your Docker container or afterwards its up to you.

subsampling every nth entry in a numpy array

You can use numpy's slicing, simply start:stop:step.

>>> xs
array([1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4])
>>> xs[1::4]
array([2, 2, 2])

This creates a view of the the original data, so it's constant time. It'll also reflect changes to the original array and keep the whole original array in memory:

>>> a
array([1, 2, 3, 4, 5])
>>> b = a[::2]         # O(1), constant time
>>> b[:] = 0           # modifying the view changes original array
>>> a                  # original array is modified
array([0, 2, 0, 4, 0])

so if either of the above things are a problem, you can make a copy explicitly:

>>> a
array([1, 2, 3, 4, 5])
>>> b = a[::2].copy()  # explicit copy, O(n)
>>> b[:] = 0           # modifying the copy
>>> a                  # original is intact
array([1, 2, 3, 4, 5])

This isn't constant time, but the result isn't tied to the original array. The copy also contiguous in memory, which can make some operations on it faster.

accessing a variable from another class

if what you need is the width and height of the frame in the circle, why not pass the DrawFrame width and height into the DrawCircle constructor:

public DrawCircle(int w, int h){
    this.w = w;
    this.h = h;
    diBig = 300;
    diSmall = 10;
    maxRad = (diBig/2) - diSmall;
    xSq = 50;
    ySq = 50;
    xPoint = 200;
    yPoint = 200;
}

you could also add a couple new methods to DrawCircle:

public void setWidth(int w) 
   this.w = w;

public void setHeight(int h)
   this.h = h;

or even:

public void setDimension(Dimension d) {
   w=d.width;
   h=d.height;
}

if you go down this route, you will need to update DrawFrame to make a local var of the DrawCircle on which to call these methods.

edit:

when changing the DrawCircle constructor as described at the top of my post, dont forget to add the width and height to the call to the constructor in DrawFrame:

public class DrawFrame extends JFrame {
 public DrawFrame() {
    int width = 400;
    int height = 400;

    setTitle("Frame");
    setSize(width, height);

    addWindowListener(new WindowAdapter()
    {
            public void windowClosing(WindowEvent e)
            {
                    System.exit(0);
            }
    });

    Container contentPane = getContentPane();
    //pass in the width and height to the DrawCircle contstructor
    contentPane.add(new DrawCircle(width, height));
 }
}

MySQL : ERROR 1215 (HY000): Cannot add foreign key constraint

CONSTRAINT vendor_tbfk_1 FOREIGN KEY (V_CODE) REFERENCES vendor (V_CODE) ON UPDATE CASCADE

this is how it could be... look at the referencing column part. (V_code)

AngularJS 1.2 $injector:modulerr

If you go through the official tutorial of angularjs https://docs.angularjs.org/tutorial/step_07

Note: Starting with AngularJS version 1.2, ngRoute is in its own module and must be loaded by loading the additional angular-route.js file, which we download via Bower above.

Also please note from ngRoute api https://docs.angularjs.org/api/ngRoute

Installation First include angular-route.js in your HTML:

You can download this file from the following places:

Google CDN e.g. //ajax.googleapis.com/ajax/libs/angularjs/X.Y.Z/angular-route.js Bower e.g. bower install [email protected] code.angularjs.org e.g. "//code.angularjs.org/X.Y.Z/angular-route.js" where X.Y.Z is the AngularJS version you are running.

Then load the module in your application by adding it as a dependent module:

angular.module('app', ['ngRoute']); With that you're ready to get started!

Remove all the elements that occur in one list from another

Sets versus list comprehension benchmark on Python 3.8

(adding up to Moinuddin Quadri's benchmarks)

tldr: Use Arkku's set solution, it's even faster than promised in comparison!

Checking existing files against a list

In my example I found it to be 40 times (!) faster to use Arkku's set solution than the pythonic list comprehension for a real world application of checking existing filenames against a list.

List comprehension:

%%time
import glob
existing = [int(os.path.basename(x).split(".")[0]) for x in glob.glob("*.txt")]
wanted = list(range(1, 100000))
[i for i in wanted if i not in existing]

Wall time: 28.2 s

Sets

%%time
import glob
existing = [int(os.path.basename(x).split(".")[0]) for x in glob.glob("*.txt")]
wanted = list(range(1, 100000))
set(wanted) - set(existing)

Wall time: 689 ms

Postgresql Select rows where column = array

   $array[0] = 1;
   $array[2] = 2;
   $arrayTxt = implode( ',', $array);
   $sql = "SELECT * FROM table WHERE some_id in ($arrayTxt)"

Directory-tree listing in Python

Here is another option.

os.scandir(path='.')

It returns an iterator of os.DirEntry objects corresponding to the entries (along with file attribute information) in the directory given by path.

Example:

with os.scandir(path) as it:
    for entry in it:
        if not entry.name.startswith('.'):
            print(entry.name)

Using scandir() instead of listdir() can significantly increase the performance of code that also needs file type or file attribute information, because os.DirEntry objects expose this information if the operating system provides it when scanning a directory. All os.DirEntry methods may perform a system call, but is_dir() and is_file() usually only require a system call for symbolic links; os.DirEntry.stat() always requires a system call on Unix but only requires one for symbolic links on Windows.

Python Docs

Client on Node.js: Uncaught ReferenceError: require is not defined

This worked for me

Save the file https://requirejs.org/docs/release/2.3.5/minified/require.js. It is the file for RequestJS which is what we will use.
Load it into your HTML content like this: <script data-main="your-script.js" src="require.js"></script>

Notes!

Use require(['moudle-name']) in your-script.js, not require('moudle-name')

Use const {ipcRenderer} = require(['electron']), not const {ipcRenderer} = require('electron')

How to import a SQL Server .bak file into MySQL?

The method I used included part of Richard Harrison's method:

So, install SQL Server 2008 Express edition,

This requires the download of the Web Platform Installer "wpilauncher_n.exe" Once you have this installed click on the database selection ( you are also required to download Frameworks and Runtimes)

After instalation go to the windows command prompt and:

use sqlcmd -S \SQLExpress (whilst logged in as administrator)

then issue the following command.

restore filelistonly from disk='c:\temp\mydbName-2009-09-29-v10.bak'; GO This will list the contents of the backup - what you need is the first fields that tell you the logical names - one will be the actual database and the other the log file.

RESTORE DATABASE mydbName FROM disk='c:\temp\mydbName-2009-09-29-v10.bak' WITH MOVE 'mydbName' TO 'c:\temp\mydbName_data.mdf', MOVE 'mydbName_log' TO 'c:\temp\mydbName_data.ldf'; GO

I fired up Web Platform Installer and from the what's new tab I installed SQL Server Management Studio and browsed the db to make sure the data was there...

At that point i tried the tool included with MSSQL "SQL Import and Export Wizard" but the result of the csv dump only included the column names...

So instead I just exported results of queries like "select * from users" from the SQL Server Management Studio

How to use double or single brackets, parentheses, curly braces

In Bash, test and [ are shell builtins.

The double bracket, which is a shell keyword, enables additional functionality. For example, you can use && and || instead of -a and -o and there's a regular expression matching operator =~.

Also, in a simple test, double square brackets seem to evaluate quite a lot quicker than single ones.

$ time for ((i=0; i<10000000; i++)); do [[ "$i" = 1000 ]]; done

real    0m24.548s
user    0m24.337s
sys 0m0.036s
$ time for ((i=0; i<10000000; i++)); do [ "$i" = 1000 ]; done

real    0m33.478s
user    0m33.478s
sys 0m0.000s

The braces, in addition to delimiting a variable name are used for parameter expansion so you can do things like:

Truncate the contents of a variable
```
$ var="abcde"; echo ${var%d*}
abc
```
Make substitutions similar to sed
```
$ var="abcde"; echo ${var/de/12}
abc12
```

Use a default value

$ default="hello"; unset var; echo ${var:-$default}
hello

and several more

Also, brace expansions create lists of strings which are typically iterated over in loops:

$ echo f{oo,ee,a}d
food feed fad

$ mv error.log{,.OLD}
(error.log is renamed to error.log.OLD because the brace expression
expands to "mv error.log error.log.OLD")

$ for num in {000..2}; do echo "$num"; done
000
001
002

$ echo {00..8..2}
00 02 04 06 08

$ echo {D..T..4}
D H L P T

Note that the leading zero and increment features weren't available before Bash 4.

Thanks to gboffi for reminding me about brace expansions.

Double parentheses are used for arithmetic operations:

((a++))

((meaning = 42))

for ((i=0; i<10; i++))

echo $((a + b + (14 * c)))

and they enable you to omit the dollar signs on integer and array variables and include spaces around operators for readability.

Single brackets are also used for array indices:

array[4]="hello"

element=${array[index]}

Curly brace are required for (most/all?) array references on the right hand side.

ephemient's comment reminded me that parentheses are also used for subshells. And that they are used to create arrays.

array=(1 2 3)
echo ${array[1]}
2

How to count items in JSON data

import json

json_data = json.dumps({
  "result":[
    {
      "run":[
        {
          "action":"stop"
        },
        {
          "action":"start"
        },
        {
          "action":"start"
        }
      ],
      "find": "true"
    }
  ]
})

item_dict = json.loads(json_data)
print len(item_dict['result'][0]['run'])

Convert it in dict.

How to keep :active css style after click a button

CSS

:active denotes the interaction state (so for a button will be applied during press), :focus may be a better choice here. However, the styling will be lost once another element gains focus.

The final potential alternative using CSS would be to use :target, assuming the items being clicked are setting routes (e.g. anchors) within the page- however this can be interrupted if you are using routing (e.g. Angular), however this doesnt seem the case here.

_x000D_

.active:active {_x000D_
  color: red;_x000D_
}_x000D_
.focus:focus {_x000D_
  color: red;_x000D_
}_x000D_
:target {_x000D_
  color: red;_x000D_
}

_x000D_

<button class='active'>Active</button>_x000D_
<button class='focus'>Focus</button>_x000D_
<a href='#target1' id='target1' class='target'>Target 1</a>_x000D_
<a href='#target2' id='target2' class='target'>Target 2</a>_x000D_
<a href='#target3' id='target3' class='target'>Target 3</a>

_x000D_

Javascript / jQuery

As such, there is no way in CSS to absolutely toggle a styled state- if none of the above work for you, you will either need to combine with a change in your HTML (e.g. based on a checkbox) or programatically apply/remove a class using e.g. jQuery

_x000D_

$('button').on('click', function(){_x000D_
    $('button').removeClass('selected');_x000D_
    $(this).addClass('selected');_x000D_
});

_x000D_

button.selected{_x000D_
  color:red;_x000D_
}

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
_x000D_
<button>Item</button><button>Item</button><button>Item</button>_x000D_

_x000D_

Debugging in Maven?

If you are using Netbeans, there is a nice shortcut to this. Just define a goal exec:java and add the property jpda.listen=maven Netbeans screenshot

Tested on Netbeans 7.3

How to subtract 2 hours from user's local time?

According to Javascript Date Documentation, you can easily do this way:

var twoHoursBefore = new Date();
twoHoursBefore.setHours(twoHoursBefore.getHours() - 2);

And don't worry about if hours you set will be out of 0..23 range. Date() object will update the date accordingly.

Loop through an array in JavaScript

for (const s of myStringArray) {

(Directly answering your question: now you can!)

Most other answers are right, but they do not mention (as of this writing) that ECMAScript 6 2015 is bringing a new mechanism for doing iteration, the for..of loop.

This new syntax is the most elegant way to iterate an array in JavaScript (as long you don't need the iteration index).

It currently works with Firefox 13+, Chrome 37+ and it does not natively work with other browsers (see browser compatibility below). Luckily we have JavaScript compilers (such as Babel) that allow us to use next-generation features today.

It also works on Node.js (I tested it on version 0.12.0).

Iterating an array

// You could also use "let" or "const" instead of "var" for block scope.
for (var letter of ["a", "b", "c"]) {
   console.log(letter);
}

Iterating an array of objects

const band = [
  {firstName : 'John', lastName: 'Lennon'},
  {firstName : 'Paul', lastName: 'McCartney'}
];

for(const member of band){
  console.log(member.firstName + ' ' + member.lastName);
}

Iterating a generator:

(example extracted from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of)

function* fibonacci() { // A generator function
  let [prev, curr] = [1, 1];
  while (true) {
    [prev, curr] = [curr, prev + curr];
    yield curr;
  }
}

for (const n of fibonacci()) {
  console.log(n);
  // Truncate the sequence at 1000
  if (n >= 1000) {
    break;
  }
}

Compatibility table: http://kangax.github.io/es5-compat-table/es6/#For..of loops

Specification: http://wiki.ecmascript.org/doku.php?id=harmony:iterators

}

Django - Did you forget to register or load this tag?

The error is in this line: (% load pygmentize %}, an invalid tag. Change it to {% load pygmentize %}

How do I use Docker environment variable in ENTRYPOINT array?

I tried to resolve with the suggested answer and still ran into some issues...

This was a solution to my problem:

ARG APP_EXE="AppName.exe"
ENV _EXE=${APP_EXE}

# Build a shell script because the ENTRYPOINT command doesn't like using ENV
RUN echo "#!/bin/bash \n mono ${_EXE}" > ./entrypoint.sh
RUN chmod +x ./entrypoint.sh

# Run the generated shell script.
ENTRYPOINT ["./entrypoint.sh"]

Specifically targeting your problem:

RUN echo "#!/bin/bash \n ./greeting --message ${ADDRESSEE}" > ./entrypoint.sh
RUN chmod +x ./entrypoint.sh
ENTRYPOINT ["./entrypoint.sh"]

getting " (1) no such column: _id10 " error

I think you missed a equal sign at:

Cursor c = ourDatabase.query(DATABASE_TABLE, column, KEY_ROWID + "" + l, null, null, null, null);

Change to:

Cursor c = ourDatabase.query(DATABASE_TABLE, column, KEY_ROWID + " = " + l, null, null, null, null);

Open youtube video in Fancybox jquery

$("a.more").click(function() {
                 $.fancybox({
                  'padding'             : 0,
                  'autoScale'   : false,
                  'transitionIn'        : 'none',
                  'transitionOut'       : 'none',
                  'title'               : this.title,
                  'width'               : 680,
                  'height'              : 495,
                  'href'                : this.href.replace(new RegExp("watch\\?v=", "i"), 'v/'),
                  'type'                : 'swf',    // <--add a comma here
                  'swf'                 : {'allowfullscreen':'true'} // <-- flashvars here
                  });
                 return false;

            });

Transaction isolation levels relation with locks on table

The locks are always taken at DB level:-

Oracle official Document:- To avoid conflicts during a transaction, a DBMS uses locks, mechanisms for blocking access by others to the data that is being accessed by the transaction. (Note that in auto-commit mode, where each statement is a transaction, locks are held for only one statement.) After a lock is set, it remains in force until the transaction is committed or rolled back. For example, a DBMS could lock a row of a table until updates to it have been committed. The effect of this lock would be to prevent a user from getting a dirty read, that is, reading a value before it is made permanent. (Accessing an updated value that has not been committed is considered a dirty read because it is possible for that value to be rolled back to its previous value. If you read a value that is later rolled back, you will have read an invalid value.)

How locks are set is determined by what is called a transaction isolation level, which can range from not supporting transactions at all to supporting transactions that enforce very strict access rules.

One example of a transaction isolation level is TRANSACTION_READ_COMMITTED, which will not allow a value to be accessed until after it has been committed. In other words, if the transaction isolation level is set to TRANSACTION_READ_COMMITTED, the DBMS does not allow dirty reads to occur. The interface Connection includes five values that represent the transaction isolation levels you can use in JDBC.

What ports need to be open for TortoiseSVN to authenticate (clear text) and commit?

What's the first part of your Subversion repository URL?

If your URL looks like: http://subversion/repos/, then you're probably going over Port 80.
If your URL looks like: https://subversion/repos/, then you're probably going over Port 443.
If your URL looks like: svn://subversion/, then you're probably going over Port 3690.
If your URL looks like: svn+ssh://subversion/repos/, then you're probably going over Port 22.
If your URL contains a port number like: http://subversion/repos:8080, then you're using that port.

I can't guarantee the first four since it's possible to reconfigure everything to use different ports, of if you go through a proxy of some sort.

If you're using a VPN, you may have to configure your VPN client to reroute these to their correct ports. A lot of places don't configure their correctly VPNs to do this type of proxying. It's either because they have some sort of anal-retentive IT person who's being overly security conscious, or because they simply don't know any better. Even worse, they'll give you a client where this stuff can't be reconfigured.

The only way around that is to log into a local machine over the VPN, and then do everything from that system.

How to use jQuery in AngularJS

You have to do binding in a directive. Look at this:

angular.module('ng', []).
directive('sliderRange', function($parse, $timeout){
    return {
        restrict: 'A',
        replace: true,
        transclude: false,
        compile: function(element, attrs) {            
            var html = '<div class="slider-range"></div>';
            var slider = $(html);
            element.replaceWith(slider);
            var getterLeft = $parse(attrs.ngModelLeft), setterLeft = getterLeft.assign;
            var getterRight = $parse(attrs.ngModelRight), setterRight = getterRight.assign;

            return function (scope, slider, attrs, controller) {
                var vsLeft = getterLeft(scope), vsRight = getterRight(scope), f = vsLeft || 0, t = vsRight || 10;                        

                var processChange = function() {
                    var vs = slider.slider("values"), f = vs[0], t = vs[1];                                        
                    setterLeft(scope, f);
                    setterRight(scope, t);                    
                }                 
                slider.slider({
                    range: true,
                    min: 0,
                    max: 10,
                    step: 1,
                    change: function() { setTimeout(function () { scope.$apply(processChange); }, 1) }
                }).slider("values", [f, t]);                    
            };            
        }
    };
});

This shows you an example of a slider range, done with jQuery UI. Example usage:

<div slider-range ng-model-left="question.properties.range_from" ng-model-right="question.properties.range_to"></div>

Converting rows into columns and columns into rows using R

Here is a tidyverse option that might work depending on the data, and some caveats on its usage:

library(tidyverse)

starting_df %>% 
  rownames_to_column() %>% 
  gather(variable, value, -rowname) %>% 
  spread(rowname, value)

rownames_to_column() is necessary if the original dataframe has meaningful row names, otherwise the new column names in the new transposed dataframe will be integers corresponding to the orignal row number. If there are no meaningful row names you can skip rownames_to_column() and replace rowname with the name of the first column in the dataframe, assuming those values are unique and meaningful. Using the tidyr::smiths sample data would be:

smiths %>% 
    gather(variable, value, -subject) %>% 
    spread(subject, value)

Using the example starting_df with the tidyverse approach will throw a warning message about dropping attributes. This is related to converting columns with different attribute types into a single character column. The smiths data will not give that warning because all columns except for subject are doubles.

The earlier answer using as.data.frame(t()) will convert everything to a factor if there are mixed column types unless stringsAsFactors = FALSE is added, whereas the tidyverse option converts everything to a character by default if there are mixed column types.

Less than or equal to

There is no => for if.
Use if %energy% GEQ %m2enc%

See if /? for some other details.

how can I see what ports mongo is listening on from mongo shell?

Beginner Python: AttributeError: 'list' object has no attribute

They are lists because you type them as lists in the dictionary:

bikes = {
    # Bike designed for children"
    "Trike": ["Trike", 20, 100],
    # Bike designed for everyone"
    "Kruzer": ["Kruzer", 50, 165]
    }

You should use the bike-class instead:

bikes = {
    # Bike designed for children"
    "Trike": Bike("Trike", 20, 100),
    # Bike designed for everyone"
    "Kruzer": Bike("Kruzer", 50, 165)
    }

This will allow you to get the cost of the bikes with bike.cost as you were trying to.

for bike in bikes.values():
    profit = bike.cost * margin
    print(bike.name + " : " + str(profit))

This will now print:

Kruzer : 33.0
Trike : 20.0

How to use UIPanGestureRecognizer to move object? iPhone/iPad

I found the tutorial Working with UIGestureRecognizers, and I think that is what I am looking for. It helped me come up with the following solution:

-(IBAction) someMethod {
    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
    [panRecognizer setMinimumNumberOfTouches:1];
    [panRecognizer setMaximumNumberOfTouches:1];
    [ViewMain addGestureRecognizer:panRecognizer];
    [panRecognizer release];
}

-(void)move:(UIPanGestureRecognizer*)sender {
    [self.view bringSubviewToFront:sender.view];
    CGPoint translatedPoint = [sender translationInView:sender.view.superview];

    if (sender.state == UIGestureRecognizerStateBegan) {
        firstX = sender.view.center.x;
        firstY = sender.view.center.y;
    }


    translatedPoint = CGPointMake(sender.view.center.x+translatedPoint.x, sender.view.center.y+translatedPoint.y);

    [sender.view setCenter:translatedPoint];
    [sender setTranslation:CGPointZero inView:sender.view];

    if (sender.state == UIGestureRecognizerStateEnded) {
        CGFloat velocityX = (0.2*[sender velocityInView:self.view].x);
        CGFloat velocityY = (0.2*[sender velocityInView:self.view].y);

        CGFloat finalX = translatedPoint.x + velocityX;
        CGFloat finalY = translatedPoint.y + velocityY;// translatedPoint.y + (.35*[(UIPanGestureRecognizer*)sender velocityInView:self.view].y);

        if (finalX < 0) {
            finalX = 0;
        } else if (finalX > self.view.frame.size.width) {
            finalX = self.view.frame.size.width;
        }

        if (finalY < 50) { // to avoid status bar
            finalY = 50;
        } else if (finalY > self.view.frame.size.height) {
            finalY = self.view.frame.size.height;
        }

        CGFloat animationDuration = (ABS(velocityX)*.0002)+.2;

        NSLog(@"the duration is: %f", animationDuration);

        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:animationDuration];
        [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
        [UIView setAnimationDelegate:self];
        [UIView setAnimationDidStopSelector:@selector(animationDidFinish)];
        [[sender view] setCenter:CGPointMake(finalX, finalY)];
        [UIView commitAnimations];
    }
}

What is pipe() function in Angular

RxJS Operators are functions that build on the observables foundation to enable sophisticated manipulation of collections.

For example, RxJS defines operators such as map(), filter(), concat(), and flatMap().

You can use pipes to link operators together. Pipes let you combine multiple functions into a single function.

The pipe() function takes as its arguments the functions you want to combine, and returns a new function that, when executed, runs the composed functions in sequence.

Table with fixed header and fixed column on pure css

Here is another solution I have just build with css grids based on the answers in here:

https://codesandbox.io/s/sweet-resonance-m733i

How to get index of object by its property in JavaScript?

a prototypical way

(function(){
  if (!Array.prototype.indexOfPropertyValue){
    Array.prototype.indexOfPropertyValue = function(prop,value){
      for (var index = 0; index < this.length; index++){
        if (this[index][prop]){
          if (this[index][prop] == value){
            return index;
          }
        }
      }
      return -1;
    }
  }
 })();
 // usage:
 var Data = [
 {id_list:1, name:'Nick',token:'312312'},{id_list:2,name:'John',token:'123123'}];
 Data.indexOfPropertyValue('name','John'); // returns 1 (index of array);
 Data.indexOfPropertyValue('name','Invalid name') // returns -1 (no result);
 var indexOfArray = Data.indexOfPropertyValue('name','John');
 Data[indexOfArray] // returns desired object.

.NET String.Format() to add commas in thousands place for a number

String.Format("{0:#,###,###.##}", MyNumber)

That will give you commas at the relevant points.

How to loop backwards in python?

To reverse a string without using reversed or [::-1], try something like:

def reverse(text):
    # Container for reversed string
    txet=""

    # store the length of the string to be reversed
    # account for indexes starting at 0
    length = len(text)-1

    # loop through the string in reverse and append each character
    # deprecate the length index
    while length>=0:
        txet += "%s"%text[length]
        length-=1
    return txet

how to add value to combobox item

Although this question is 5 years old I have come across a nice solution.

Use the 'DictionaryEntry' object to pair keys and values.

Set the 'DisplayMember' and 'ValueMember' properties to:

   Me.myComboBox.DisplayMember = "Key"
   Me.myComboBox.ValueMember = "Value"

To add items to the ComboBox:

   Me.myComboBox.Items.Add(New DictionaryEntry("Text to be displayed", 1))

To retreive items like this:

MsgBox(Me.myComboBox.SelectedItem.Key & " " & Me.myComboBox.SelectedItem.Value)

Insert line break in wrapped cell via code

You could also use vbCrLf which corresponds to Chr(13) & Chr(10).

How to Generate Unique ID in Java (Integer)?

If you really meant integer rather than int:

Integer id = new Integer(42); // will not == any other Integer

If you want something visible outside a JVM to other processes or to the user, persistent, or a host of other considerations, then there are other approaches, but without context you are probably better off using using the built-in uniqueness of object identity within your system.

How to get request URI without context path?

getPathInfo() sometimes return null. In documentation HttpServletRequest

This method returns null if there was no extra path information.

I need get path to file without context path in Filter and getPathInfo() return me null. So I use another method: httpRequest.getServletPath()

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException
{
    HttpServletRequest httpRequest = (HttpServletRequest) request;
    HttpServletResponse httpResponse = (HttpServletResponse) response;

    String newPath = parsePathToFile(httpRequest.getServletPath());
    ...

}

Name node is in safe mode. Not able to leave

use below command to turn off the safe mode

$> hdfs dfsadmin -safemode leave

Writing/outputting HTML strings unescaped

Supposing your content is inside a string named mystring...

You can use:

@Html.Raw(mystring)

Alternatively you can convert your string to HtmlString or any other type that implements IHtmlString in model or directly inline and use regular @:

@{ var myHtmlString = new HtmlString(mystring);}
@myHtmlString

Token based authentication in Web API without any user interface

I think there is some confusion about the difference between MVC and Web Api. In short, for MVC you can use a login form and create a session using cookies. For Web Api there is no session. That's why you want to use the token.

You do not need a login form. The Token endpoint is all you need. Like Win described you'll send the credentials to the token endpoint where it is handled.

Here's some client side C# code to get a token:

    //using System;
    //using System.Collections.Generic;
    //using System.Net;
    //using System.Net.Http;
    //string token = GetToken("https://localhost:<port>/", userName, password);

    static string GetToken(string url, string userName, string password) {
        var pairs = new List<KeyValuePair<string, string>>
                    {
                        new KeyValuePair<string, string>( "grant_type", "password" ), 
                        new KeyValuePair<string, string>( "username", userName ), 
                        new KeyValuePair<string, string> ( "Password", password )
                    };
        var content = new FormUrlEncodedContent(pairs);
        ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, sslPolicyErrors) => true;
        using (var client = new HttpClient()) {
            var response = client.PostAsync(url + "Token", content).Result;
            return response.Content.ReadAsStringAsync().Result;
        }
    }

In order to use the token add it to the header of the request:

    //using System;
    //using System.Collections.Generic;
    //using System.Net;
    //using System.Net.Http;
    //var result = CallApi("https://localhost:<port>/something", token);

    static string CallApi(string url, string token) {
        ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, sslPolicyErrors) => true;
        using (var client = new HttpClient()) {
            if (!string.IsNullOrWhiteSpace(token)) {
                var t = JsonConvert.DeserializeObject<Token>(token);

                client.DefaultRequestHeaders.Clear();
                client.DefaultRequestHeaders.Add("Authorization", "Bearer " + t.access_token);
            }
            var response = client.GetAsync(url).Result;
            return response.Content.ReadAsStringAsync().Result;
        }
    }

Where Token is:

//using Newtonsoft.Json;

class Token
{
    public string access_token { get; set; }
    public string token_type { get; set; }
    public int expires_in { get; set; }
    public string userName { get; set; }
    [JsonProperty(".issued")]
    public string issued { get; set; }
    [JsonProperty(".expires")]
    public string expires { get; set; }
}

Now for the server side:

In Startup.Auth.cs

        var oAuthOptions = new OAuthAuthorizationServerOptions
        {
            TokenEndpointPath = new PathString("/Token"),
            Provider = new ApplicationOAuthProvider("self"),
            AccessTokenExpireTimeSpan = TimeSpan.FromDays(14),
            // https
            AllowInsecureHttp = false
        };
        // Enable the application to use bearer tokens to authenticate users
        app.UseOAuthBearerTokens(oAuthOptions);

And in ApplicationOAuthProvider.cs the code that actually grants or denies access:

//using Microsoft.AspNet.Identity.Owin;
//using Microsoft.Owin.Security;
//using Microsoft.Owin.Security.OAuth;
//using System;
//using System.Collections.Generic;
//using System.Security.Claims;
//using System.Threading.Tasks;

public class ApplicationOAuthProvider : OAuthAuthorizationServerProvider
{
    private readonly string _publicClientId;

    public ApplicationOAuthProvider(string publicClientId)
    {
        if (publicClientId == null)
            throw new ArgumentNullException("publicClientId");

        _publicClientId = publicClientId;
    }

    public override async Task GrantResourceOwnerCredentials(OAuthGrantResourceOwnerCredentialsContext context)
    {
        var userManager = context.OwinContext.GetUserManager<ApplicationUserManager>();

        var user = await userManager.FindAsync(context.UserName, context.Password);
        if (user == null)
        {
            context.SetError("invalid_grant", "The user name or password is incorrect.");
            return;
        }

        ClaimsIdentity oAuthIdentity = await user.GenerateUserIdentityAsync(userManager);
        var propertyDictionary = new Dictionary<string, string> { { "userName", user.UserName } };
        var properties = new AuthenticationProperties(propertyDictionary);

        AuthenticationTicket ticket = new AuthenticationTicket(oAuthIdentity, properties);
        // Token is validated.
        context.Validated(ticket);
    }

    public override Task TokenEndpoint(OAuthTokenEndpointContext context)
    {
        foreach (KeyValuePair<string, string> property in context.Properties.Dictionary)
        {
            context.AdditionalResponseParameters.Add(property.Key, property.Value);
        }
        return Task.FromResult<object>(null);
    }

    public override Task ValidateClientAuthentication(OAuthValidateClientAuthenticationContext context)
    {
        // Resource owner password credentials does not provide a client ID.
        if (context.ClientId == null)
            context.Validated();

        return Task.FromResult<object>(null);
    }

    public override Task ValidateClientRedirectUri(OAuthValidateClientRedirectUriContext context)
    {
        if (context.ClientId == _publicClientId)
        {
            var expectedRootUri = new Uri(context.Request.Uri, "/");

            if (expectedRootUri.AbsoluteUri == context.RedirectUri)
                context.Validated();
        }
        return Task.FromResult<object>(null);
    }

}

As you can see there is no controller involved in retrieving the token. In fact, you can remove all MVC references if you want a Web Api only. I have simplified the server side code to make it more readable. You can add code to upgrade the security.

Make sure you use SSL only. Implement the RequireHttpsAttribute to force this.

You can use the Authorize / AllowAnonymous attributes to secure your Web Api. Additionally you can add filters (like RequireHttpsAttribute) to make your Web Api more secure. I hope this helps.

How to use an environment variable inside a quoted string in Bash

You are doing it right, so I guess something else is at fault (not export-ing COLUMNS ?).

A trick to debug these cases is to make a specialized command (a closure for programming language guys). Create a shell script named diff-columns doing:

exec /usr/bin/diff -x -y -w -p -W "$COLUMNS" "$@"

and just use

svn diff "$@" --diff-cmd  diff-columns

This way your code is cleaner to read and more modular (top-down approach), and you can test the diff-columns code thouroughly separately (bottom-up approach).

Printing to the console in Google Apps Script?

In a google script project you can create html files (example: index.html) or gs files (example:code.gs). The .gs files are executed on the server and you can use Logger.log as @Peter Herrman describes. However if the function is created in a .html file it is being executed on the user's browser and you can use console.log. The Chrome browser console can be viewed by Ctrl Shift J on Windows/Linux or Cmd Opt J on Mac

If you want to use Logger.log on an html file you can use a scriptlet to call the Logger.log function from the html file. To do so you would insert <? Logger.log(something) ?> replacing something with whatever you want to log. Standard scriptlets, which use the syntax <? ... ?>, execute code without explicitly outputting content to the page.

How do I add FTP support to Eclipse?

As none of the other solutions mentioned satisfied me, I wrote a script that uses WinSCP to sync local directories in a project to a FTP(S)/SFTP/SCP Server when eclipse's autobuild feature is triggered. Obviously, this is a Windows-only solution.

Maybe someone finds this useful: http://rays-blog.de/2012/05/05/94/use-winscp-to-upload-files-using-eclipses-autobuild-feature/

Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]

I am using Eclipse mars, Hibernate 5.2.1, Jdk7 and Oracle 11g.

I get the same error when I run Hibernate code generation tool. I guess it is a versions issue due to I have solved it through choosing Hibernate version (5.1 to 5.0) in the type frame in my Hibernate console configuration.

Check for internet connection with Swift

here is the same code with accepted answer but I find it more useful for some cases to use closures

import SystemConfiguration

public class Reachability {

    class func isConnectedToNetwork(isConnected : (Bool) -> ()) {

        var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
        zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress))
        zeroAddress.sin_family = sa_family_t(AF_INET)

        let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {
            $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {zeroSockAddress in
                SCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)
            }
        }

        var flags: SCNetworkReachabilityFlags = SCNetworkReachabilityFlags(rawValue: 0)
        if SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) == false {
            isConnected(false)
        }

        /* Only Working for WIFI
        let isReachable = flags == .reachable
        let needsConnection = flags == .connectionRequired

        return isReachable && !needsConnection
        */

        // Working for Cellular and WIFI
        let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0
        let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0
        let ret = (isReachable && !needsConnection)

        isConnected(ret)
    }
}

and here is how to use it:

Reachability.isConnectedToNetwork { (isConnected) in
    if isConnected {
        //We have internet connection | get data from server
    } else {
        //We don't have internet connection | load from database 
    }
}

Comparing user-inputted characters in C

I see two problems:

The pointer answer is a null pointer and you are trying to dereference it in scanf, this leads to undefined behavior.

You don't need a char pointer here. You can just use a char variable as:

char answer;
scanf(" %c",&answer);

Next to see if the read character is 'y' or 'Y' you should do:

if( answer == 'y' || answer == 'Y') {
  // user entered y or Y.
}

If you really need to use a char pointer you can do something like:

char var;
char *answer = &var; // make answer point to char variable var.
scanf (" %c", answer);
if( *answer == 'y' || *answer == 'Y') {

Saving a Numpy array as an image

If you are working in python environment Spyder, then it cannot get more easier than to just right click the array in variable explorer, and then choose Show Image option.

This will ask you to save image to dsik, mostly in PNG format.

PIL library will not be needed in this case.

How can I draw vertical text with CSS cross-browser?

I am using the following code to write vertical text in a page. Firefox 3.5+, webkit, opera 10.5+ and IE

.rot-neg-90 {
    -moz-transform:rotate(-270deg); 
    -moz-transform-origin: bottom left;
    -webkit-transform: rotate(-270deg);
    -webkit-transform-origin: bottom left;
    -o-transform: rotate(-270deg);
    -o-transform-origin:  bottom left;
    filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=1);
}

Insert into C# with SQLCommand

Use AddWithValue(), but be aware of the possibility of the wrong implicit type conversion.
like this:

cmd.Parameters.AddWithValue("@param1", klantId);
    cmd.Parameters.AddWithValue("@param2", klantNaam);
    cmd.Parameters.AddWithValue("@param3", klantVoornaam);

EXCEL VBA Check if entry is empty or not 'space'

A common trick is to check like this:

trim(TextBox1.Value & vbnullstring) = vbnullstring

this will work for spaces, empty strings, and genuine null values

Java - removing first character of a string

Use the substring() function with an argument of 1 to get the substring from position 1 (after the first character) to the end of the string (leaving the second argument out defaults to the full length of the string).

"Jamaica".substring(1);

How to enable C++11/C++0x support in Eclipse CDT?

For Eclipse CDT Kepler what worked for me to get rid of std::thread unresolved symbol is:

Go to Preferences->C/C++->Build->Settings
Select the Discovery tab
Select CDT GCC Built-in Compiler Settings [Shared]
Add the -std=c++11 to the "Command to get the compiler specs:" field such as:

${COMMAND} -E -P -v -dD -std=c++11 ${INPUTS}

Ok and Rebuild Index for the project.

Adding -std=c++11 to project Properties/C/C++ Build->Settings->Tool Settings->GCC C++ Compiler->Miscellaneous->Other Flags wasn't enough for Kepler, however it was enough for older versions such as Helios.

No converter found capable of converting from type to type

You may already have this working, but the I created a test project with the classes below allowing you to retrieve the data into an entity, projection or dto.

Projection - this will return the code column twice, once named code and also named text (for example only). As you say above, you don't need the @Projection annotation

import org.springframework.beans.factory.annotation.Value;

public interface DeadlineTypeProjection {
    String getId();

    // can get code and or change name of getter below
    String getCode();

    // Points to the code attribute of entity class
    @Value(value = "#{target.code}")
    String getText();
}

DTO class - not sure why this was inheriting from your base class and then redefining the attributes. JsonProperty just an example of how you'd change the name of the field passed back to a REST end point

import com.fasterxml.jackson.annotation.JsonProperty;
import lombok.AllArgsConstructor;
import lombok.Data;

@Data
@AllArgsConstructor
public class DeadlineType {
    String id;

    // Use this annotation if you need to change the name of the property that is passed back from controller
    // Needs to be called code to be used in Repository
    @JsonProperty(value = "text")
    String code;

}

Entity class

import lombok.Data;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Data
@Entity
@Table(name = "deadline_type")
public class ABDeadlineType {

    @Id
    private String id;
    private String code;
}

Repository - your repository extends JpaRepository<ABDeadlineType, Long> but the Id is a String, so updated below to JpaRepository<ABDeadlineType, String>

import com.example.demo.entity.ABDeadlineType;
import com.example.demo.projection.DeadlineTypeProjection;
import com.example.demo.transfer.DeadlineType;
import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

public interface ABDeadlineTypeRepository extends JpaRepository<ABDeadlineType, String> {

    List<ABDeadlineType> findAll();

    List<DeadlineType> findAllDtoBy();

    List<DeadlineTypeProjection> findAllProjectionBy();

}

Example Controller - accesses the repository directly to simplify code

@RequestMapping(value = "deadlinetype")
@RestController
public class DeadlineTypeController {

    private final ABDeadlineTypeRepository abDeadlineTypeRepository;

    @Autowired
    public DeadlineTypeController(ABDeadlineTypeRepository abDeadlineTypeRepository) {
        this.abDeadlineTypeRepository = abDeadlineTypeRepository;
    }

    @GetMapping(value = "/list")
    public ResponseEntity<List<ABDeadlineType>> list() {

        List<ABDeadlineType> types = abDeadlineTypeRepository.findAll();
        return ResponseEntity.ok(types);
    }

    @GetMapping(value = "/listdto")
    public ResponseEntity<List<DeadlineType>> listDto() {

        List<DeadlineType> types = abDeadlineTypeRepository.findAllDtoBy();
        return ResponseEntity.ok(types);
    }

    @GetMapping(value = "/listprojection")
    public ResponseEntity<List<DeadlineTypeProjection>> listProjection() {

        List<DeadlineTypeProjection> types = abDeadlineTypeRepository.findAllProjectionBy();
        return ResponseEntity.ok(types);
    }
}

Hope that helps

Les

does linux shell support list data structure?

It supports lists, but not as a separate data structure (ignoring arrays for the moment).

The for loop iterates over a list (in the generic sense) of white-space separated values, regardless of how that list is created, whether literally:

for i in 1 2 3; do
    echo "$i"
done

or via parameter expansion:

listVar="1 2 3"
for i in $listVar; do
    echo "$i"
done

or command substitution:

for i in $(echo 1; echo 2; echo 3); do
    echo "$i"
done

An array is just a special parameter which can contain a more structured list of value, where each element can itself contain whitespace. Compare the difference:

array=("item 1" "item 2" "item 3")
for i in "${array[@]}"; do   # The quotes are necessary here
    echo "$i"
done

list='"item 1" "item 2" "item 3"'
for i in $list; do
    echo $i
done
for i in "$list"; do
    echo $i
done
for i in ${array[@]}; do
    echo $i
done

Opencv - Grayscale mode Vs gray color conversion

_{Note: This is not a duplicate, because the OP is aware that the image from cv2.imread is in BGR format (unlike the suggested duplicate question that assumed it was RGB hence the provided answers only address that issue)}

To illustrate, I've opened up this same color JPEG image:

once using the conversion

img = cv2.imread(path)
img_gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

and another by loading it in gray scale mode

img_gray_mode = cv2.imread(path, cv2.IMREAD_GRAYSCALE)

Like you've documented, the diff between the two images is not perfectly 0, I can see diff pixels in towards the left and the bottom

I've summed up the diff too to see

import numpy as np
np.sum(diff)
# I got 6143, on a 494 x 750 image

I tried all cv2.imread() modes

Among all the IMREAD_ modes for cv2.imread(), only IMREAD_COLOR and IMREAD_ANYCOLOR can be converted using COLOR_BGR2GRAY, and both of them gave me the same diff against the image opened in IMREAD_GRAYSCALE

The difference doesn't seem that big. My guess is comes from the differences in the numeric calculations in the two methods (loading grayscale vs conversion to grayscale)

Naturally what you want to avoid is fine tuning your code on a particular version of the image just to find out it was suboptimal for images coming from a different source.

In brief, let's not mix the versions and types in the processing pipeline.

So I'd keep the image sources homogenous, e.g. if you have capturing the image from a video camera in BGR, then I'd use BGR as the source, and do the BGR to grayscale conversion cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

Vice versa if my ultimate source is grayscale then I'd open the files and the video capture in gray scale cv2.imread(path, cv2.IMREAD_GRAYSCALE)

DropDownList's SelectedIndexChanged event not firing

Instead of what you have written, you can write it directly in the SelectedIndexChanged event of the dropdownlist control, e.g.

protected void ddlleavetype_SelectedIndexChanged(object sender, EventArgs e)
{
 //code goes here
}

Is it possible to remove the hand cursor that appears when hovering over a link? (or keep it set as the normal pointer)

Using inline styling use <a href="your link here" style="cursor:default">your content here</a>. See this example

Alternatively use css. See this example.

This solution is cross-browser compatible.

Cannot get Kerberos service ticket: KrbException: Server not found in Kerberos database (7)

sqlcmd works, System.Data.SqlClient not working - Server not found in Kerberos database. You should add RestrictedKrbHost SPN

https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-kile/445e4499-7e49-4f2a-8d82-aaf2d1ee3c47

5.1.2 SPNs with Serviceclass Equal to "RestrictedKrbHost"

Supporting the "RestrictedKrbHost" service class allows client applications to use Kerberos authentication when they do not have the identity of the service but have the server name. This does not provide client-to-service mutual authentication, but rather client-to-server computer authentication. Services of different privilege levels have the same session key and could decrypt each other's data if the underlying service does not ensure that data cannot be accessed by higher services.

How to convert a string or integer to binary in Ruby?

In ruby Integer class, to_s is defined to receive non required argument radix called base, pass 2 if you want to receive binary representation of a string.

Here is a link for an official documentation of String#to_s

  1.upto(10).each { |n|  puts n.to_s(2) }

How to make a new line or tab in <string> XML (eclipse/android)?

You can use \n for new line and \t for tabs. Also, extra spaces/tabs are just copied the way you write them in Strings.xml so just give a couple of spaces where ever you want them.

A better way to reach this would probably be using padding/margin in your view xml and splitting up your long text in different strings in your string.xml

What does %5B and %5D in POST requests stand for?

As per this answer over here: str='foo%20%5B12%5D' encodes foo [12]:

%20 is space
%5B is '['
and %5D is ']'

This is called percent encoding and is used in encoding special characters in the url parameter values.

EDIT By the way as I was reading https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/encodeURI#Description, it just occurred to me why so many people make the same search. See the note on the bottom of the page:

Also note that if one wishes to follow the more recent RFC3986 for URL's, making square brackets reserved (for IPv6) and thus not encoded when forming something which could be part of a URL (such as a host), the following may help.

function fixedEncodeURI (str) {
    return encodeURI(str).replace(/%5B/g, '[').replace(/%5D/g, ']');
}

Hopefully this will help people sort out their problems when they stumble upon this question.

Unzip a file with php

Just use this:

  $master = $_GET["master"];
  system('unzip' $master.'.zip');

in your code $master is passed as a string, system will be looking for a file called $master.zip

  $master = $_GET["master"];
  system('unzip $master.zip'); `enter code here`

How to add time to DateTime in SQL

You can do:

SELECT GETDATE()+'03:30:00'

Swift: declare an empty dictionary

var parking = [Dictionary < String, Double >()]

^ this adds a dictionary for a [string:double] input

Install an apk file from command prompt?

Press Win+R > cmd
Navigate to platform-tools\ in the android-sdk windows folder
Type adb
now follow the steps writte by Mohit Kanada (ensure that you mention the entire path of the .apk file for eg. d:\android-apps\test.apk)

extract digits in a simple way from a python string

Without using regex, you can just do:

def get_num(x):
    return int(''.join(ele for ele in x if ele.isdigit()))

Result:

>>> get_num(x)
120
>>> get_num(y)
90
>>> get_num(banana)
200
>>> get_num(orange)
300

EDIT :

Answering the follow up question.

If we know that the only period in a given string is the decimal point, extracting a float is quite easy:

def get_num(x):
    return float(''.join(ele for ele in x if ele.isdigit() or ele == '.'))

Result:

>>> get_num('dfgd 45.678fjfjf')
45.678

How to run a script at the start up of Ubuntu?

First of all, the easiest way to run things at startup is to add them to the file /etc/rc.local.

Another simple way is to use @reboot in your crontab. Read the cron manpage for details.

However, if you want to do things properly, in addition to adding a script to /etc/init.d you need to tell ubuntu when the script should be run and with what parameters. This is done with the command update-rc.d which creates a symlink from some of the /etc/rc* directories to your script. So, you'd need to do something like:

update-rc.d yourscriptname start 2

However, real init scripts should be able to handle a variety of command line options and otherwise integrate to the startup process. The file /etc/init.d/README has some details and further pointers.

Detecting a redirect in ajax request?

The AJAX request never has the opportunity to NOT follow the redirect (i.e., it must follow the redirect). More information can be found in this answer https://stackoverflow.com/a/2573589/965648

Use CSS to automatically add 'required field' asterisk to form inputs

input[required]{
    background-image: radial-gradient(#F00 15%, transparent 16%), radial-gradient(#F00 15%, transparent 16%);
    background-size: 1em 1em;
    background-position: right top;
    background-repeat: no-repeat;
}

Difference between a Seq and a List in Scala

As @daniel-c-sobral said, List extends the trait Seq and is an abstract class implemented by scala.collection.immutable.$colon$colon (or :: for short), but technicalities aside, mind that most of lists and seqs we use are initialized in the form of Seq(1, 2, 3) or List(1, 2, 3) which both return scala.collection.immutable.$colon$colon, hence one can write:

var x: scala.collection.immutable.$colon$colon[Int] = null
x = Seq(1, 2, 3).asInstanceOf[scala.collection.immutable.$colon$colon[Int]]
x = List(1, 2, 3).asInstanceOf[scala.collection.immutable.$colon$colon[Int]]

As a result, I'd argue than the only thing that matters are the methods you want to expose, for instance to prepend you can use :: from List that I find redundant with +: from Seq and I personally stick to Seq by default.

Angular HTTP GET with TypeScript error http.get(...).map is not a function in [null]

Plus what @mlc-mlapis commented, you're mixing lettable operators and the prototype patching method. Use one or the other.

For your case it should be

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';
import 'rxjs/add/operator/map';

@Injectable()
export class SwPeopleService {
    people$ = this.http.get('https://swapi.co/api/people/')
      .map((res:any) => res.results);

    constructor(private http: HttpClient) {} 
}

https://stackblitz.com/edit/angular-http-observables-9nchvz?file=app%2Fsw-people.service.ts

Change the row color in DataGridView based on the quantity of a cell value

Try this (Note: I don't have right now Visual Studio ,so code is copy paste from my archive(I haven't test it) :

Private Sub DataGridView1_CellFormatting(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellFormattingEventArgs) Handles DataGridView1.CellFormatting
    Dim drv As DataRowView
    If e.RowIndex >= 0 Then
        If e.RowIndex <= ds.Tables("Products").Rows.Count - 1 Then
            drv = ds.Tables("Products").DefaultView.Item(e.RowIndex)
            Dim c As Color
            If drv.Item("Quantity").Value < 5  Then
                c = Color.LightBlue
            Else
                c = Color.Pink
            End If
            e.CellStyle.BackColor = c
        End If
    End If
End Sub

Deleting rows with Python in a CSV file

You are very close; currently you compare the row[2] with integer 0, make the comparison with the string "0". When you read the data from a file, it is a string and not an integer, so that is why your integer check fails currently:

row[2]!="0":

Also, you can use the with keyword to make the current code slightly more pythonic so that the lines in your code are reduced and you can omit the .close statements:

import csv
with open('first.csv', 'rb') as inp, open('first_edit.csv', 'wb') as out:
    writer = csv.writer(out)
    for row in csv.reader(inp):
        if row[2] != "0":
            writer.writerow(row)

Note that input is a Python builtin, so I've used another variable name instead.

Edit: The values in your csv file's rows are comma and space separated; In a normal csv, they would be simply comma separated and a check against "0" would work, so you can either use strip(row[2]) != 0, or check against " 0".

The better solution would be to correct the csv format, but in case you want to persist with the current one, the following will work with your given csv file format:

$ cat test.py 
import csv
with open('first.csv', 'rb') as inp, open('first_edit.csv', 'wb') as out:
    writer = csv.writer(out)
    for row in csv.reader(inp):
        if row[2] != " 0":
            writer.writerow(row)
$ cat first.csv 
6.5, 5.4, 0, 320
6.5, 5.4, 1, 320
$ python test.py 
$ cat first_edit.csv 
6.5, 5.4, 1, 320

Maximum length of HTTP GET request

Yes. There isn't any limit on a GET request.

I am able to send ~4000 characters as part of the query string using both the Chrome browser and curl command.

I am using Tomcat 8.x server which has returned the expected 200 OK response.

Here is the screenshot of a Google Chrome HTTP request (hiding the endpoint I tried due to security reasons):

RESPONSE

Python 2.6: Class inside a Class?

It sounds like you are talking about aggregation. Each instance of your player class can contain zero or more instances of Airplane, which, in turn, can contain zero or more instances of Flight. You can implement this in Python using the built-in list type to save you naming variables with numbers.

class Flight(object):

    def __init__(self, duration):
        self.duration = duration


class Airplane(object):

    def __init__(self):
        self.flights = []

    def add_flight(self, duration):
        self.flights.append(Flight(duration))


class Player(object):

    def __init__ (self, stock = 0, bank = 200000, fuel = 0, total_pax = 0):
        self.stock = stock
        self.bank = bank
        self.fuel = fuel
        self.total_pax = total_pax
        self.airplanes = []


    def add_planes(self):
        self.airplanes.append(Airplane())



if __name__ == '__main__':
    player = Player()
    player.add_planes()
    player.airplanes[0].add_flight(5)

Keep SSH session alive

The ssh daemon (sshd), which runs server-side, closes the connection from the server-side if the client goes silent (i.e., does not send information). To prevent connection loss, instruct the ssh client to send a sign-of-life signal to the server once in a while.

The configuration for this is in the file $HOME/.ssh/config, create the file if it does not exist (the config file must not be world-readable, so run chmod 600 ~/.ssh/config after creating the file). To send the signal every e.g. four minutes (240 seconds) to the remote host, put the following in that configuration file:

Host remotehost
    HostName remotehost.com
    ServerAliveInterval 240

To enable sending a keep-alive signal for all hosts, place the following contents in the configuration file:

Host *
    ServerAliveInterval 240

How to parseInt in Angular.js

Perform the operation inside the scope itself.

<script>
angular.controller('MyCtrl', function($scope, $window) {
$scope.num1= 0;
$scope.num2= 1;


  $scope.total = $scope.num1 + $scope.num2;

 });
</script>
<input type="text" ng-model="num1">
<input type="text" ng-model="num2">

Total: {{total}}

Hive cast string to date dd-MM-yyyy

If I have understood it correctly, you are trying to convert a String representing a given date, to another type.

Note: (As @Samson Scharfrichter has mentioned)

the default representation of a date is ISO8601
a date is stored in binary (not as a string)

There are a few ways to do it. And you are close to the solution. I would use the CAST (which converts to a DATE_TYPE):

SELECT cast('2018-06-05' as date);

Result: 2018-06-05 DATE_TYPE

or (depending on your pattern)

select cast(to_date(from_unixtime(unix_timestamp('05-06-2018', 'dd-MM-yyyy'))) as date)

Result: 2018-06-05 DATE_TYPE

And if you decide to convert ISO8601 to a date type:

select cast(to_date(from_unixtime(unix_timestamp(regexp_replace('2018-06-05T08:02:59Z', 'T',' ')))) as date);

Result: 2018-06-05 DATE_TYPE

Hive has its own functions, I have written some examples for the sake of illustration of these date- and cast- functions:

Date and timestamp functions examples:

Convert String/Timestamp/Date to DATE

SELECT cast(date_format('2018-06-05 15:25:42.23','yyyy-MM-dd') as date); -- 2018-06-05 DATE_TYPE
SELECT cast(date_format(current_date(),'yyyy-MM-dd') as date); -- 2018-06-05 DATE_TYPE
SELECT cast(date_format(current_timestamp(),'yyyy-MM-dd') as date);  -- 2018-06-05 DATE_TYPE

Convert String/Timestamp/Date to BIGINT_TYPE

SELECT to_unix_timestamp('2018/06/05 15:25:42.23','yyyy/MM/dd HH:mm:ss'); -- 1528205142 BIGINT_TYPE
SELECT to_unix_timestamp(current_date(),'yyyy/MM/dd HH:mm:ss'); -- 1528205000 BIGINT_TYPE
SELECT to_unix_timestamp(current_timestamp(),'yyyy/MM/dd HH:mm:ss'); -- 1528205142 BIGINT_TYPE

Convert String/Timestamp/Date to STRING

SELECT date_format('2018-06-05 15:25:42.23','yyyy-MM-dd'); -- 2018-06-05 STRING_TYPE
SELECT date_format(current_timestamp(),'yyyy-MM-dd'); -- 2018-06-05 STRING_TYPE
SELECT date_format(current_date(),'yyyy-MM-dd'); -- 2018-06-05 STRING_TYPE

Convert BIGINT unixtime to STRING

SELECT to_date(from_unixtime(unixtime,'yyyy/MM/dd HH:mm:ss')); -- 2018-06-05 STRING_TYPE

Convert String to BIGINT unixtime

SELECT unix_timestamp('2018-06-05 15:25:42.23','yyyy-MM-dd') as TIMESTAMP; -- 1528149600 BIGINT_TYPE

Convert String to TIMESTAMP

SELECT cast(unix_timestamp('2018-06-05 15:25:42.23','yyyy-MM-dd') as TIMESTAMP); -- 1528149600 TIMESTAMP_TYPE

Idempotent (String -> String)

SELECT from_unixtime(to_unix_timestamp('2018/06/05 15:25:42.23','yyyy/MM/dd HH:mm:ss')); -- 2018-06-05 15:25:42 STRING_TYPE

Idempotent (Date -> Date)

SELECT cast(current_date() as date); -- 2018-06-26 DATE_TYPE

Current date / timestamp

SELECT current_date(); -- 2018-06-26 DATE_TYPE
SELECT current_timestamp(); -- 2018-06-26 14:03:38.285 TIMESTAMP_TYPE

Java Error opening registry key

I got this kind of error whe nI had JDK 1.7 before and I installed JAVA JDK 1.8 and pointed my JAVA_HOME and PATH variables to JAVA 1.8 version. When I try to find the java version I got this error. I restarted my machine, and it works . It seems to be we have to restart the machine after modifying the environment variables.

Is there any kind of hash code function in JavaScript?

Here's my simple solution that returns a unique integer.

function hashcode(obj) {
    var hc = 0;
    var chars = JSON.stringify(obj).replace(/\{|\"|\}|\:|,/g, '');
    var len = chars.length;
    for (var i = 0; i < len; i++) {
        // Bump 7 to larger prime number to increase uniqueness
        hc += (chars.charCodeAt(i) * 7);
    }
    return hc;
}

Add views below toolbar in CoordinatorLayout

Take the attribute

app:layout_behavior="@string/appbar_scrolling_view_behavior"

off the RecyclerView and put it on the FrameLayout that you are trying to show under the Toolbar.

I've found that one important thing the scrolling view behavior does is to layout the component below the toolbar. Because the FrameLayout has a descendant that will scroll (RecyclerView), the CoordinatorLayout will get those scrolling events for moving the Toolbar.

One other thing to be aware of: That layout behavior will cause the FrameLayout height to be sized as if the Toolbar is already scrolled, and with the Toolbar fully displayed the entire view is simply pushed down so that the bottom of the view is below the bottom of the CoordinatorLayout.

This was a surprise to me. I was expecting the view to be dynamically resized as the toolbar is scrolled up and down. So if you have a scrolling component with a fixed component at the bottom of your view, you won't see that bottom component until you have fully scrolled the Toolbar.

So when I wanted to anchor a button at the bottom of the UI, I worked around this by putting the button at the bottom of the CoordinatorLayout (android:layout_gravity="bottom") and adding a bottom margin equal to the button's height to the view beneath the toolbar.

Reduce git repository size

Thanks for your replies. Here's what I did:

git gc
git gc --aggressive
git prune

That seemed to have done the trick. I started with around 10.5MB and now it's little more than 980KBs.

Excel - extracting data based on another list

New Excel versions

=IF(ISNA(VLOOKUP(A1,B,B,1,FALSE)),"",A1)

Older Excel versions

=IF(ISNA(VLOOKUP(A1;B:B;1;FALSE));"";A1)

That is: "If the value of A1 exists in the B column, display it here. If it doesn't exist, leave it empty."

ping: google.com: Temporary failure in name resolution

If you get the IP address from a DHCP server, you can also set the server to send a DNS server. Or add the nameserver 8.8.8.8 into /etc/resolvconf/resolv.conf.d/base file. The information in this file is included in the resolver configuration file even when no interfaces are configured.

How to get Chrome to allow mixed content?

Another solution which is permanent in nature between sessions without requiring you to run a specific command when opening chrome is as follows:

Open a Chrome window
In the URL bar enter Chrome://net-internals
Click on "Domain Security Policy" in the side-bar
Add the domain name which you want to always be able to access in http form into the "Add HSTS/PKP domain" section

What is the maximum recursion depth in Python, and how to increase it?

It's to avoid a stack overflow. The Python interpreter limits the depths of recursion to help you avoid infinite recursions, resulting in stack overflows. Try increasing the recursion limit (sys.setrecursionlimit) or re-writing your code without recursion.

From the Python documentation:

sys.getrecursionlimit()

Return the current value of the recursion limit, the maximum depth of the Python interpreter stack. This limit prevents infinite recursion from causing an overflow of the C stack and crashing Python. It can be set by setrecursionlimit().

What is this CSS selector? [class*="span"]

It's an attribute wildcard selector. In the sample you've given, it looks for any child element under .show-grid that has a class that CONTAINS span.

So would select the <strong> element in this example:

<div class="show-grid">
    <strong class="span6">Blah blah</strong>
</div>

You can also do searches for 'begins with...'

div[class^="something"] { }

which would work on something like this:-

<div class="something-else-class"></div>

and 'ends with...'

div[class$="something"] { }

which would work on

<div class="you-are-something"></div>

Good references

re.sub erroring with "Expected string or bytes-like object"

The simplest solution is to apply Python str function to the column you are trying to loop through.

If you are using pandas, this can be implemented as:

dataframe['column_name']=dataframe['column_name'].apply(str)

What does "O(1) access time" mean?

It means that access time is constant. Whether you're accessing from 100 or 100,000 records, the retrieval time will be the same.

In contrast, O(n) access time would indicate that the retrieval time is directly proportional to the number of records you're accessing from.

The backend version is not supported to design database diagrams or tables

I was having the same problem, although I solved out by creating the table using a script query instead of doing it graphically. See the snipped below:

USE [Database_Name]
GO

CREATE TABLE [dbo].[Table_Name](
[tableID] [int] IDENTITY(1,1) NOT NULL,
[column_2] [datatype] NOT NULL,
[column_3] [datatype] NOT NULL,

CONSTRAINT [PK_Table_Name] PRIMARY KEY CLUSTERED 
(
[tableID] ASC
)
)

How to find the default JMX port number?

Now I need to connect that application from my local computer, but I don't know the JMX port number of the remote computer. Where can I find it? Or, must I restart that application with some VM parameters to specify the port number?

By default JMX does not publish on a port unless you specify the arguments from this page: How to activate JMX...

-Dcom.sun.management.jmxremote # no longer required for JDK6
-Dcom.sun.management.jmxremote.port=9010
-Dcom.sun.management.jmxremote.local.only=false # careful with security implications
-Dcom.sun.management.jmxremote.authenticate=false # careful with security implications

If you are running you should be able to access any of those system properties to see if they have been set:

if (System.getProperty("com.sun.management.jmxremote") == null) {
    System.out.println("JMX remote is disabled");
} else [
    String portString = System.getProperty("com.sun.management.jmxremote.port");
    if (portString != null) {
        System.out.println("JMX running on port "
            + Integer.parseInt(portString));
    }
}

Depending on how the server is connected, you might also have to specify the following parameter. As part of the initial JMX connection, jconsole connects up to the RMI port to determine which port the JMX server is running on. When you initially start up a JMX enabled application, it looks its own hostname to determine what address to return in that initial RMI transaction. If your hostname is not in /etc/hosts or if it is set to an incorrect interface address then you can override it with the following:

-Djava.rmi.server.hostname=<IP address>

As an aside, my SimpleJMX package allows you to define both the JMX server and the RMI port or set them both to the same port. The above port defined with com.sun.management.jmxremote.port is actually the RMI port. This tells the client what port the JMX server is running on.

CSS selector last row from main table

Your tables should have as immediate children just tbody and thead elements, with the rows within*. So, amend the HTML to be:

<table border="1" width="100%" id="test">
  <tbody>
    <tr>
     <td>
      <table border="1" width="100%">
        <tbody>
          <tr>
            <td>table 2</td>
          </tr>
        </tbody>
      </table>
     </td>
    </tr> 
    <tr><td>table 1</td></tr>
    <tr><td>table 1</td></tr>
    <tr><td>table 1</td></tr>
  </tbody>
</table>

Then amend your selector slightly to this:

#test > tbody > tr:last-child { background:#ff0000; }

See it in action here. That makes use of the child selector, which:

...separates two selectors and matches only those elements matched by the second selector that are direct children of elements matched by the first.

So, you are targeting only direct children of tbody elements that are themselves direct children of your #test table.

Alternative solution

The above is the neatest solution, as you don't need to over-ride any styles. The alternative would be to stick with your current set-up, and over-ride the background style for the inner table, like this:

#test tr:last-child { background:#ff0000; }
#test table tr:last-child { background:transparent; }

* It's not mandatory but most (all?) browsers will add these in, so it's best to make it explicit. As @BoltClock states in the comments:

...it's now set in stone in HTML5, so for a browser to be compliant it basically must behave this way.

file_get_contents(): SSL operation failed with code 1, Failed to enable crypto

Working for me, I am using PHP 5.6. openssl extension should be enabled and while calling google map api verify_peer make false Below code is working for me.

<?php
$arrContextOptions=array(
    "ssl"=>array(
         "verify_peer"=>false,
         "verify_peer_name"=>false,
    ),
);  
$url = "https://maps.googleapis.com/maps/api/geocode/json?latlng="
      . $latitude
      . ","
      . $longitude
      . "&sensor=false&key="
      . Yii::$app->params['GOOGLE_API_KEY'];

$data = file_get_contents($url, false, stream_context_create($arrContextOptions));

echo $data;
?>

How to access nested elements of json object using getJSONArray method

You have to decompose the full object to reach the entry array.

Assuming REPONSE_JSON_OBJECT is already a parsed JSONObject.

REPONSE_JSON_OBJECT.getJSONObject("result")
    .getJSONObject("map")
    .getJSONArray("entry");

Key Presses in Python

Install the pywin32 extensions. Then you can do the following:

import win32com.client as comclt
wsh= comclt.Dispatch("WScript.Shell")
wsh.AppActivate("Notepad") # select another application
wsh.SendKeys("a") # send the keys you want

Search for documentation of the WScript.Shell object (I believe installed by default in all Windows XP installations). You can start here, perhaps.

EDIT: Sending F11

import win32com.client as comctl
wsh = comctl.Dispatch("WScript.Shell")

# Google Chrome window title
wsh.AppActivate("icanhazip.com")
wsh.SendKeys("{F11}")

How to ignore a particular directory or file for tslint?

Can confirm that on version tslint 5.11.0 it works by modifying lint script in package.json by defining exclude argument:

"lint": "ng lint --exclude src/models/** --exclude package.json"

Cheers!!

List of zeros in python

#add code here to figure out the number of 0's you need, naming the variable n.
listofzeros = [0] * n

if you prefer to put it in the function, just drop in that code and add return listofzeros

Which would look like this:

def zerolistmaker(n):
    listofzeros = [0] * n
    return listofzeros

sample output:

>>> zerolistmaker(4)
[0, 0, 0, 0]
>>> zerolistmaker(5)
[0, 0, 0, 0, 0]
>>> zerolistmaker(15)
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
>>>

Facebook Open Graph Error - Inferred Property

You need a space after the final set of quote marks

<meta property="og:url" content="http://www.mywebaddress.com"/>

Should be..likes this one

<meta property="og:url" content="http://www.mywebaddress.com" />

Regex match one of two words

This will do:

/^(apple|banana)$/

to exclude from captured strings (e.g. $1,$2):

(?:apple|banana)

Sort divs in jQuery based on attribute 'data-sort'?

I made this into a jQuery function:

jQuery.fn.sortDivs = function sortDivs() {
    $("> div", this[0]).sort(dec_sort).appendTo(this[0]);
    function dec_sort(a, b){ return ($(b).data("sort")) < ($(a).data("sort")) ? 1 : -1; }
}

So you have a big div like "#boo" and all your little divs inside of there:

$("#boo").sortDivs();

You need the "? 1 : -1" because of a bug in Chrome, without this it won't sort more than 10 divs! http://blog.rodneyrehm.de/archives/14-Sorting-Were-Doing-It-Wrong.html

How can I remove the last character of a string in python?

No need to use expensive regex, if barely needed then try- Use r'(/)(?=$)' pattern that is capture last / and replace with r'' i.e. blank character.

>>>re.sub(r'(/)(?=$)',r'','/home/ro/A_Python_Scripts/flask-auto/myDirectory/scarlett Johanson/1448543562.17.jpg/')
>>>'/home/ro/A_Python_Scripts/flask-auto/myDirectory/scarlett Johanson/1448543562.17.jpg'

What is the difference between readonly="true" & readonly="readonly"?

I'm not sure how they're functionally different. My current batch of OS X browsers don't show any difference.

I would assume they are all functionally the same due to legacy HTML attribute handling. Back in the day, any flag (Boolean) attribute need only be present, sans value, eg

<input readonly>
<option selected>

When XHTML came along, this syntax wasn't valid and values were required. Whilst the W3 specified using the attribute name as the value, I'm guessing most browser vendors decided to simply check for attribute existence.

How to run html file using node js

This is a simple html file "demo.htm" stored in the same folder as the node.js file.

<!DOCTYPE html>
<html>
  <body>
    <h1>Heading</h1>
    <p>Paragraph.</p>
  </body>
</html>

Below is the node.js file to call this html file.

var http = require('http');
var fs = require('fs');

var server = http.createServer(function(req, resp){
  // Print the name of the file for which request is made.
  console.log("Request for demo file received.");
  fs.readFile("Documents/nodejs/demo.html",function(error, data){
    if (error) {
      resp.writeHead(404);
      resp.write('Contents you are looking for-not found');
      resp.end();
    }  else {
      resp.writeHead(200, {
        'Content-Type': 'text/html'
      });
      resp.write(data.toString());
      resp.end();
    }
  });
});

server.listen(8081, '127.0.0.1');

console.log('Server running at http://127.0.0.1:8081/');

Intiate the above nodejs file in command prompt and the message "Server running at http://127.0.0.1:8081/" is displayed.Now in your browser type "http://127.0.0.1:8081/demo.html".

What is the difference between Integer and int in Java?

An int variable holds a 32 bit signed integer value. An Integer (with capital I) holds a reference to an object of (class) type Integer, or to null.

Java automatically casts between the two; from Integer to int whenever the Integer object occurs as an argument to an int operator or is assigned to an int variable, or an int value is assigned to an Integer variable. This casting is called boxing/unboxing.

If an Integer variable referencing null is unboxed, explicitly or implicitly, a NullPointerException is thrown.

(In the above text, the term "variable" means local variable, field or parameter)

how to add super privileges to mysql database?

You can add super privilege using phpmyadmin:

Go to PHPMYADMIN > privileges > Edit User > Under Administrator tab Click SUPER. > Go

If you want to do it through Console, do like this:

 mysql> GRANT SUPER ON *.* TO user@'localhost' IDENTIFIED BY 'password';

After executing above code, end it with:

mysql> FLUSH PRIVILEGES;

You should do in on *.* because SUPER is not the privilege that applies just to one database, it's global.

Change size of text in text input tag?

Change your code into

<input class="my-style" type="text" />

CSS:

.my-style {
  font-size:25px;
}

How to acces external json file objects in vue.js app

I have recently started working on a project using Vue JS, JSON Schema. I am trying to access nested JSON Objects from a JSON Schema file in the Vue app. I tried the below code and now I can load different JSON objects inside different Vue template tags. In the script tag add the below code

import  {JsonObject1name, JsonObject2name} from 'your Json file path';

Now you can access JsonObject1,2 names in data section of export default part as below:

data: () => ({ 
  
  schema: JsonObject1name,
  schema1: JsonObject2name,   
  
  model: {} 
}),

Now you can load the schema, schema1 data inside Vue template according to your requirement. See below code for example :

      <SchemaForm id="unique name representing your Json object1" class="form"  v-model="model" :schema="schema" :components="components">
      </SchemaForm>  

      <SchemaForm id="unique name representing your Json object2" class="form" v-model="model" :schema="schema1" :components="components">
      </SchemaForm>

SchemaForm is the local variable name for @formSchema/native library. I have implemented the data of different JSON objects through forms in different CSS tabs.

I hope this answer helps someone. I can help if there are any questions.

Rename a table in MySQL

Please try

RENAME TABLE  `oldTableName` TO  `newTableName`

jQuery change input text value

Best practice is using the identify directly:

$('#id').val('xxx');

Can I change the headers of the HTTP request sent by the browser?

ModHeader extension for Google Chrome, is also a good option. You can just set the Headers you want and just enter the URL in the browser, it will automatically take the headers from the extension when you hit the url. Only thing is, it will send headers for each and every URL you will hit so you have to disable or delete it after use.

psql: command not found Mac

If Postgres was downloaded and installed, running this should fix the issue:

sudo mkdir -p /etc/paths.d &&
echo /Applications/Postgres.app/Contents/Versions/latest/bin | sudo tee 
/etc/paths.d/postgresapp

Restart the terminal and you'll be able to use psql command.

Ref: https://postgresapp.com/documentation/cli-tools.html

Adding an image to a project in Visual Studio

You just need to have an existing file, open the context menu on your folder , and then choose Add => Existing item...
If you have the file already placed within your project structure, but it is not yet included, you can do so by making them visible in the solution explorer

and then include them via the file context menu

How can I create a Java method that accepts a variable number of arguments?

The following will create a variable length set of arguments of the type of string:

print(String arg1, String... arg2)

You can then refer to arg2 as an array of Strings. This is a new feature in Java 5.

Double quotes within php script echo

You can just forgo the quotes for alphanumeric attributes:

echo "<font color=red> XHTML is not a thing anymore. </font>";
echo "<div class=editorial-note> There, I said it. </div>";

Is perfectly valid in HTML, and though still shunned, absolutely en vogue since HTML5.

CAVEATS

It's only valid for mostly alphanumeric and dash combinations.
Never ever do this with user input appended to attributes (those need quoting and htmlspecialchars or some whitelisting).
See also: When the attribute value can remain unquoted in HTML5
In other news: <font> specifically is somewhat outdated however.

Warning: Null value is eliminated by an aggregate or other SET operation in Aqua Data Studio

Use ISNULL(field, 0) It can also be used with aggregates:

ISNULL(count(field), 0)

However, you might consider changing count(field) to count(*)

Edit:

try:

closedcases = ISNULL(
   (select count(closed) from ticket       
    where assigned_to = c.user_id and closed is not null       
    group by assigned_to), 0), 

opencases = ISNULL(
    (select count(closed) from ticket 
     where assigned_to = c.user_id and closed is null 
     group by assigned_to), 0),

How to interpret "loss" and "accuracy" for a machine learning model

They are two different metrics to evaluate your model's performance usually being used in different phases.

Loss is often used in the training process to find the "best" parameter values for your model (e.g. weights in neural network). It is what you try to optimize in the training by updating weights.

Accuracy is more from an applied perspective. Once you find the optimized parameters above, you use this metrics to evaluate how accurate your model's prediction is compared to the true data.

Let us use a toy classification example. You want to predict gender from one's weight and height. You have 3 data, they are as follows:(0 stands for male, 1 stands for female)

y1 = 0, x1_w = 50kg, x2_h = 160cm;

y2 = 0, x2_w = 60kg, x2_h = 170cm;

y3 = 1, x3_w = 55kg, x3_h = 175cm;

You use a simple logistic regression model that is y = 1/(1+exp-(b1*x_w+b2*x_h))

How do you find b1 and b2? you define a loss first and use optimization method to minimize the loss in an iterative way by updating b1 and b2.

In our example, a typical loss for this binary classification problem can be: (a minus sign should be added in front of the summation sign)

We don't know what b1 and b2 should be. Let us make a random guess say b1 = 0.1 and b2 = -0.03. Then what is our loss now?

$\hat{y}_1 = \frac{1}{ 1 + e^{ -(0.1 \cdot 50 - 0.03 \cdot 160) } } = 0.549834 = 0.55$

$\hat{y}_2 = \frac{1}{ 1 + e^{ -(0.1 \cdot 60 - 0.03 \cdot 170) } } = 0.7109495 = 0.71$

$\hat{y}_3 = \frac{1}{ 1 + e^{ -(0.1 \cdot 55 - 0.03 \cdot 175) } } = 0.5621765 = 0.56$

so the loss is

$-\log(1-0.55) -\log(1-0.71) - \log(0.56) \simeq 2.6162$

Then you learning algorithm (e.g. gradient descent) will find a way to update b1 and b2 to decrease the loss.

What if b1=0.1 and b2=-0.03 is the final b1 and b2 (output from gradient descent), what is the accuracy now?

Let's assume if y_hat >= 0.5, we decide our prediction is female(1). otherwise it would be 0. Therefore, our algorithm predict y1 = 1, y2 = 1 and y3 = 1. What is our accuracy? We make wrong prediction on y1 and y2 and make correct one on y3. So now our accuracy is 1/3 = 33.33%

PS: In Amir's answer, back-propagation is said to be an optimization method in NN. I think it would be treated as a way to find gradient for weights in NN. Common optimization method in NN are GradientDescent and Adam.

Python: Making a beep noise

# playsound in cross plate form, just install it with pip
#  first install playsound > pip install playsound
from playsound import playsound
playsound('audio.mp3')

Include of non-modular header inside framework module

Try going Build Settings under "Target" and set "Allow Non-modular Includes in Framework Modules" to YES.

The real answer is that the location of the imports needs to be changed by the library owner. Those files ifaddrs.h, arpa/inet.h, sys/types.h are getting imported in a .h file in a framework, which Xcode doesn't like. The library maintainer should move them to a .m file. See for example this issue on GitHub, where AFNetworking fixed the same problem: https://github.com/AFNetworking/AFNetworking/issues/2205

SQLException : String or binary data would be truncated

It could also be because you're trying to put in a null value back into the database. So one of your transactions could have nulls in them.

What does Python's eval() do?

Python: Remove division decimal

if val % 1 == 0:
    val = int(val)

else:
    val = float(val)

This worked for me.

How it works: if the remainder of the quotient of val and 1 is 0, val has to be an integer and can, therefore, be declared to be int without having to worry about losing decimal numbers.

Compare these two situations:

val = 12.00

if val % 1 == 0:
    val = int(val)
else:
    val = float(val)

print(val)

In this scenario, the output is 12, because 12.00 divided by 1 has the remainder of 0. With this information we know, that val doesn't have any decimals and we can declare val to be int.

val = 13.58

if val % 1 == 0:
    val = int(val)
else:
    val = float(val)

print(val)

This time the output is 13.58, because when val is divided by 1 there is a remainder (0.58) and therefore val is declared to be a float.

By just declaring the number to be an int (without testing the remainder) decimal numbers will be cut off.

This way there are no zeros in the end and no other than the zeros will be ignored.

Select max value of each group

SELECT DISTINCT (t1.ProdId), t1.Quantity FROM Dummy t1 INNER JOIN
       (SELECT ProdId, MAX(Quantity) as MaxQuantity FROM Dummy GROUP BY ProdId) t2
    ON t1.ProdId = t2.ProdId
   AND t1.Quantity = t2.MaxQuantity
 ORDER BY t1.ProdId

this will give you the idea.

Casting string to enum

Use Enum.Parse().

var content = (ContentEnum)Enum.Parse(typeof(ContentEnum), fileContentMessage);

How to convert column with dtype as object to string in Pandas Dataframe

You could try using df['column'].str. and then use any string function. Pandas documentation includes those like split

Using app.config in .Net Core

It is possible to use your usual System.Configuration even in .NET Core 2.0 on Linux. Try this test example:

Created a .NET Standard 2.0 Library (say MyLib.dll)
Added the NuGet package System.Configuration.ConfigurationManager v4.4.0. This is needed since this package isn't covered by the meta-package NetStandard.Library v2.0.0 (I hope that changes)
All your C# classes derived from ConfigurationSection or ConfigurationElement go into MyLib.dll. For example MyClass.cs derives from ConfigurationSection and MyAccount.cs derives from ConfigurationElement. Implementation details are out of scope here but Google is your friend.
Create a .NET Core 2.0 app (e.g. a console app, MyApp.dll). .NET Core apps end with .dll rather than .exe in Framework.
Create an app.config in MyApp with your custom configuration sections. This should obviously match your class designs in #3 above. For example:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <section name="myCustomConfig" type="MyNamespace.MyClass, MyLib" />
  </configSections>
  <myCustomConfig>
    <myAccount id="007" />
  </myCustomConfig>
</configuration>

That's it - you'll find that the app.config is parsed properly within MyApp and your existing code within MyLib works just fine. Don't forget to run dotnet restore if you switch platforms from Windows (dev) to Linux (test).

Additional workaround for test projects

If you're finding that your App.config is not working in your test projects, you might need this snippet in your test project's .csproj (e.g. just before the ending </Project>). It basically copies App.config into your output folder as testhost.dll.config so dotnet test picks it up.

  <!-- START: This is a buildtime work around for https://github.com/dotnet/corefx/issues/22101 -->
  <Target Name="CopyCustomContent" AfterTargets="AfterBuild">
    <Copy SourceFiles="App.config" DestinationFiles="$(OutDir)\testhost.dll.config" />
  </Target>
  <!-- END: This is a buildtime work around for https://github.com/dotnet/corefx/issues/22101 -->

Check whether a table contains rows or not sql server 2005

Can't you just count the rows using select count(*) from table (or an indexed column instead of * if speed is important)?

If not then maybe this article can point you in the right direction.

How to get old Value with onchange() event in text box

Maybe you can try to save the old value with the "onfocus" event to afterwards compare it with the new value with the "onchange" event.

TCPDF not render all CSS properties

TCPDF 6.2.11 (2015-08-02)

Some things won't work when included within <style> tags, however they will if added in a style="" attribute in the HTML tag. E.g. table padding – this doesn't work:

table {
    padding: 5px;
}

This does:

<table style="padding: 5px;">

Commit only part of a file in Git

With TortoiseGit:

right click on the file and use Context Menu ? Restore after commit. This will create a copy of the file as it is. Then you can edit the file, e.g. in TortoiseGitMerge and undo all the changes you don't want to commit. After saving those changes you can commit the file.

How to use executeReader() method to retrieve the value of just one cell

It is not recommended to use DataReader and Command.ExecuteReader to get just one value from the database. Instead, you should use Command.ExecuteScalar as following:

String sql = "SELECT ColumnNumber FROM learer WHERE learer.id = " + index;
SqlCommand cmd = new SqlCommand(sql,conn);
learerLabel.Text = (String) cmd.ExecuteScalar();

Here is more information about Connecting to database and managing data.

Visual Studio 2013 error MS8020 Build tools v140 cannot be found

That's the platform toolset for VS2015. You uninstalled it, therefore it is no longer available.

To change your Platform Toolset:

Right click your project, go to Properties.
Under Configuration Properties, go to General.
Change your Platform Toolset to one of the available ones.

How to check the multiple permission at single request in Android M?

Here i have a simple solution, - (Multiple permission checking)

String[] permissions = new String[]{
  Manifest.permission.WRITE_CALL_LOG,
  Manifest.permission.READ_CALL_LOG,
  Manifest.permission.READ_CONTACTS,
  Manifest.permission.WRITE_CONTACTS}; // Here i used multiple permission check

Then call it in Oncreate

 if (checkPermissions()) { //  permissions  granted.
    getCallDetails();
 }

Finally, copy the below code

private boolean checkPermissions() {
  int result;
  List<String> listPermissionsNeeded = new ArrayList<>();

   for (String p : permissions) {
     result = ContextCompat.checkSelfPermission(getApplicationContext(), p);
     if (result != PackageManager.PERMISSION_GRANTED) {
       listPermissionsNeeded.add(p);
     }
   }

   if (!listPermissionsNeeded.isEmpty()) {
     ActivityCompat.requestPermissions(this, listPermissionsNeeded.toArray(new String[listPermissionsNeeded.size()]), MULTIPLE_PERMISSIONS);
     return false;
   }
     return true;
}


@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
  switch (requestCode) {
    case MULTIPLE_PERMISSIONS: {
      if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {  // permissions granted.
           getCallDetails(); // Now you call here what ever you want :)
        } else {
             String perStr = "";
               for (String per : permissions) {
                   perStr += "\n" + per;
                }   // permissions list of don't granted permission
              }
            return;
          }
       }
    }

DIV height set as percentage of screen?

make position absolute for that div.

http://jsfiddle.net/btevfik/KkKeZ/

How do I use $scope.$watch and $scope.$apply in AngularJS?

In AngularJS, we update our models, and our views/templates update the DOM "automatically" (via built-in or custom directives).

$apply and $watch, both being Scope methods, are not related to the DOM.

The Concepts page (section "Runtime") has a pretty good explanation of the $digest loop, $apply, the $evalAsync queue and the $watch list. Here's the picture that accompanies the text:

$digest loop

Whatever code has access to a scope – normally controllers and directives (their link functions and/or their controllers) – can set up a "watchExpression" that AngularJS will evaluate against that scope. This evaluation happens whenever AngularJS enters its $digest loop (in particular, the "$watch list" loop). You can watch individual scope properties, you can define a function to watch two properties together, you can watch the length of an array, etc.

When things happen "inside AngularJS" – e.g., you type into a textbox that has AngularJS two-way databinding enabled (i.e., uses ng-model), an $http callback fires, etc. – $apply has already been called, so we're inside the "AngularJS" rectangle in the figure above. All watchExpressions will be evaluated (possibly more than once – until no further changes are detected).

When things happen "outside AngularJS" – e.g., you used bind() in a directive and then that event fires, resulting in your callback being called, or some jQuery registered callback fires – we're still in the "Native" rectangle. If the callback code modifies anything that any $watch is watching, call $apply to get into the AngularJS rectangle, causing the $digest loop to run, and hence AngularJS will notice the change and do its magic.

Git: Could not resolve host github.com error while cloning remote repository in git

It works for me

git config --global --unset http.proxy

git config --global --unset https.proxy

Are HTTPS headers encrypted?

New answer to old question, sorry. I thought I'd add my $.02

The OP asked if the headers were encrypted.

They are: in transit.

They are NOT: when not in transit.

So, your browser's URL (and title, in some cases) can display the querystring (which usually contain the most sensitive details) and some details in the header; the browser knows some header information (content type, unicode, etc); and browser history, password management, favorites/bookmarks, and cached pages will all contain the querystring. Server logs on the remote end can also contain querystring as well as some content details.

Also, the URL isn't always secure: the domain, protocol, and port are visible - otherwise routers don't know where to send your requests.

Also, if you've got an HTTP proxy, the proxy server knows the address, usually they don't know the full querystring.

So if the data is moving, it's generally protected. If it's not in transit, it's not encrypted.

Not to nit pick, but data at the end is also decrypted, and can be parsed, read, saved, forwarded, or discarded at will. And, malware at either end can take snapshots of data entering (or exiting) the SSL protocol - such as (bad) Javascript inside a page inside HTTPS which can surreptitiously make http (or https) calls to logging websites (since access to local harddrive is often restricted and not useful).

Also, cookies are not encrypted under the HTTPS protocol, either. Developers wanting to store sensitive data in cookies (or anywhere else for that matter) need to use their own encryption mechanism.

As to cache, most modern browsers won't cache HTTPS pages, but that fact is not defined by the HTTPS protocol, it is entirely dependent on the developer of a browser to be sure not to cache pages received through HTTPS.

So if you're worried about packet sniffing, you're probably okay. But if you're worried about malware or someone poking through your history, bookmarks, cookies, or cache, you are not out of the water yet.

Split value from one field to two

use this

SELECT SUBSTRING_INDEX(SUBSTRING_INDEX( `membername` , ' ', 2 ),' ',1) AS b, 
SUBSTRING_INDEX(SUBSTRING_INDEX( `membername` , ' ', -1 ),' ',2) AS c FROM `users` WHERE `userid`='1'

TypeError: unsupported operand type(s) for -: 'str' and 'int'

The reason this is failing is because (Python 3) input returns a string. To convert it to an integer, use int(some_string).

You do not typically keep track of indices manually in Python. A better way to implement such a function would be

def cat_n_times(s, n):
    for i in range(n):
        print(s) 

text = input("What would you like the computer to repeat back to you: ")
num = int(input("How many times: ")) # Convert to an int immediately.

cat_n_times(text, num)

I changed your API above a bit. It seems to me that n should be the number of times and s should be the string.

How can I perform an inspect element in Chrome on my Galaxy S3 Android device?

Update: 8-20-2015

Please note the instructions have changed since this question was asked 2 yrs ago.

So on Newer versions of Android and Chrome for Android. You need to use this.

https://developers.google.com/web/tools/setup/remote-debugging/remote-debugging?hl=en

Original Answer:

I have the S3 and it works fine. I have found that a common mistake is not enabling USB Debugging in Chrome mobile. Not only do you have to enable USB debugging on the device itself under developer options but you have to go to the Chrome Browser on your phone and enable it in the settings there too.

Try this with the SDK

Chrome for Mobile - Settings > Developer Tools > [x] Enable USB Web debugging
Device - Settings > Developer options > [x] USB debugging
Connect Device to Computer
Enable port forwarding on your computer by doing the following command below

C:\adb forward tcp:9222 localabstract:chrome_devtools_remote

Go to http://localhost:9222 in Chrome on your Computer

TroubleShooting:

If you get command not found when trying to run ADB, make sure Platform-Tools is in your path or just use the whole path to your SDK and run it

C:\path-to-SDK\platform-tools\adb forward tcp:9222 localabstract:chrome_devtools_remote

If you get "device not found", then run adb kill-server and then try again.

How to upload a file using Java HttpClient library working with PHP

An update for those trying to use MultipartEntity...

org.apache.http.entity.mime.MultipartEntity is deprecated in 4.3.1.

You can use MultipartEntityBuilder to create the HttpEntity object.

File file = new File();

HttpEntity httpEntity = MultipartEntityBuilder.create()
    .addBinaryBody("file", file, ContentType.create("image/jpeg"), file.getName())
    .build();

For Maven users the class is available in the following dependency (almost the same as fervisa's answer, just with a later version).

<dependency>
  <groupId>org.apache.httpcomponents</groupId>
  <artifactId>httpmime</artifactId>
  <version>4.3.1</version>
</dependency>

How do I update all my CPAN modules to their latest versions?

An alternative method to using upgrade from the default CPAN shell is to use cpanminus and cpan-outdated.

These are so easy and nimble to use that I hardly ever go back to CPAN shell. To upgrade all of your modules in one go, the command is:

cpan-outdated -p | cpanm

I recommend you install cpanminus like the docs describe:

curl -L https://cpanmin.us | perl - App::cpanminus

And then install cpan-outdated along with all other CPAN modules using cpanm:

cpanm App::cpanoutdated

BTW: If you are using perlbrew then you will need to repeat this for every Perl you have installed under it.

You can find out more about cpanminus and cpan-outdated at the Github repos here:

Using CSS to insert text

The answer using jQuery that everyone seems to like has a major flaw, which is it is not scalable (at least as it is written). I think Martin Hansen has the right idea, which is to use HTML5 data-* attributes. And you can even use the apostrophe correctly:

html:

<div class="task" data-task-owner="Joe">mop kitchen</div>
<div class="task" data-task-owner="Charles" data-apos="1">vacuum hallway</div>

css:

div.task:before { content: attr(data-task-owner)"'s task - " ; }
div.task[data-apos]:before { content: attr(data-task-owner)"' task - " ; }

output:

Joe's task - mop kitchen
Charles' task - vacuum hallway

PHP Notice: Undefined offset: 1 with array when reading data

The ideal solution would be as below. You won't miss the values from 0 to n.

$len=count($data);
for($i=0;$i<$len;$i++)
     echo $data[$i]. "<br>";

'Operation is not valid due to the current state of the object' error during postback

Somebody posted quite a few form fields to your page. The new default max introduced by the recent security update is 1000.

Try adding the following setting in your web.config's <appsettings> block. in this block you are maximizing the MaxHttpCollection values this will override the defaults set by .net Framework. you can change the value accordingly as per your form needs

<appSettings>
    <add key="aspnet:MaxHttpCollectionKeys" value="2001" />
 </appSettings>

For more information please read this post. For more insight into the security patch by microsoft you can read this Knowledge base article

Update Angular model after setting input value with jQuery

I don't think jQuery is required here.

You can use $watch and ng-click instead

<div ng-app="myApp">
  <div ng-controller="MyCtrl">
    <input test-change ng-model="foo" />
    <span>{{foo}}</span>

    <button ng-click=" foo= 'xxx' ">click me</button>
    <!-- this changes foo value, you can also call a function from your controller -->
  </div>
</div>

In your controller :

$scope.$watch('foo', function(newValue, oldValue) {
  console.log(newValue);
  console.log(oldValue);
});

Table-level backup

You can run the below query to take a backup of the existing table which would create a new table with existing structure of the old table along with the data.

select * into newtablename from oldtablename

To copy just the table structure, use the below query.

select * into newtablename from oldtablename where 1 = 2

How do I force Robocopy to overwrite files?

From the documentation:

/is Includes the same files. /it Includes "tweaked" files.

"Same files" means files that are identical (name, size, times, attributes). "Tweaked files" means files that have the same name, size, and times, but different attributes.

robocopy src dst sample.txt /is      # copy if attributes are equal
robocopy src dst sample.txt /it      # copy if attributes differ
robocopy src dst sample.txt /is /it  # copy irrespective of attributes

This answer on Super User has a good explanation of what kind of files the selection parameters match.

With that said, I could reproduce the behavior you describe, but from my understanding of the documentation and the output robocopy generated in my tests I would consider this a bug.

PS C:\temp> New-Item src -Type Directory >$null
PS C:\temp> New-Item dst -Type Directory >$null
PS C:\temp> New-Item src\sample.txt -Type File -Value "test001" >$null
PS C:\temp> New-Item dst\sample.txt -Type File -Value "test002" >$null
PS C:\temp> Set-ItemProperty src\sample.txt -Name LastWriteTime -Value "2016/1/1 15:00:00"
PS C:\temp> Set-ItemProperty dst\sample.txt -Name LastWriteTime -Value "2016/1/1 15:00:00"
PS C:\temp> robocopy src dst sample.txt /is /it /copyall /mir
...
  Options : /S /E /COPYALL /PURGE /MIR /IS /IT /R:1000000 /W:30

------------------------------------------------------------------------------

                           1    C:\temp\src\
            Modified                   7        sample.txt

------------------------------------------------------------------------------

               Total    Copied   Skipped  Mismatch    FAILED    Extras
    Dirs :         1         0         0         0         0         0
   Files :         1         1         0         0         0         0
   Bytes :         7         7         0         0         0         0
...
PS C:\temp> robocopy src dst sample.txt /is /it /copyall /mir
...
  Options : /S /E /COPYALL /PURGE /MIR /IS /IT /R:1000000 /W:30

------------------------------------------------------------------------------

                           1    C:\temp\src\
            Same                       7        sample.txt

------------------------------------------------------------------------------

               Total    Copied   Skipped  Mismatch    FAILED    Extras
    Dirs :         1         0         0         0         0         0
   Files :         1         1         0         0         0         0
   Bytes :         7         7         0         0         0         0
...
PS C:\temp> Get-Content .\src\sample.txt
test001
PS C:\temp> Get-Content .\dst\sample.txt
test002

The file is listed as copied, and since it becomes a same file after the first robocopy run at least the times are synced. However, even though seven bytes have been copied according to the output no data was actually written to the destination file in both cases despite the data flag being set (via /copyall). The behavior also doesn't change if the data flag is set explicitly (/copy:d).

I had to modify the last write time to get robocopy to actually synchronize the data.

PS C:\temp> Set-ItemProperty src\sample.txt -Name LastWriteTime -Value (Get-Date)
PS C:\temp> robocopy src dst sample.txt /is /it /copyall /mir
...
  Options : /S /E /COPYALL /PURGE /MIR /IS /IT /R:1000000 /W:30

------------------------------------------------------------------------------

                           1    C:\temp\src\
100%        Newer                      7        sample.txt

------------------------------------------------------------------------------

               Total    Copied   Skipped  Mismatch    FAILED    Extras
    Dirs :         1         0         0         0         0         0
   Files :         1         1         0         0         0         0
   Bytes :         7         7         0         0         0         0
...
PS C:\temp> Get-Content .\dst\sample.txt
test001

An admittedly ugly workaround would be to change the last write time of same/tweaked files to force robocopy to copy the data:

& robocopy src dst /is /it /l /ndl /njh /njs /ns /nc |
  Where-Object { $_.Trim() } |
  ForEach-Object {
    $f = Get-Item $_
    $f.LastWriteTime = $f.LastWriteTime.AddSeconds(1)
  }
& robocopy src dst /copyall /mir

Switching to xcopy is probably your best option:

& xcopy src dst /k/r/e/i/s/c/h/f/o/x/y

Is it possible to assign numeric value to an enum in Java?

Yes, and then some, example from documentation:

public enum Planet {
    MERCURY (3.303e+23, 2.4397e6),
    VENUS   (4.869e+24, 6.0518e6),
    EARTH   (5.976e+24, 6.37814e6),
    MARS    (6.421e+23, 3.3972e6),
    JUPITER (1.9e+27,   7.1492e7),
    SATURN  (5.688e+26, 6.0268e7),
    URANUS  (8.686e+25, 2.5559e7),
    NEPTUNE (1.024e+26, 2.4746e7);

    // in kilograms
    private final double mass;
    // in meters
    private final double radius;
    Planet(double mass, double radius) {
        this.mass = mass;
        this.radius = radius;
    }
    private double mass() { return mass; }
    private double radius() { return radius; }

    // universal gravitational 
    // constant  (m3 kg-1 s-2)
    public static final double G = 6.67300E-11;

    double surfaceGravity() {
        return G * mass / (radius * radius);
    }
    double surfaceWeight(double otherMass) {
        return otherMass * surfaceGravity();
    }
    public static void main(String[] args) {
        if (args.length != 1) {
            System.err.println("Usage: java Planet <earth_weight>");
            System.exit(-1);
        }
        double earthWeight = Double.parseDouble(args[0]);
        double mass = earthWeight/EARTH.surfaceGravity();
        for (Planet p : Planet.values())
           System.out.printf("Your weight on %s is %f%n",
                             p, p.surfaceWeight(mass));
    }
}

Reload child component when variables on parent component changes. Angular2

You can use @input with ngOnChanges, to see the changes when it happened.

reference: https://angular.io/api/core/OnChanges

(or)

If you want to pass data between multiple component or routes then go with Rxjs way.

Service.ts

import { Injectable } from '@angular/core';
import { Observable, Subject } from 'rxjs';

@Injectable({ providedIn: 'root' })
export class MessageService {
  private subject = new Subject<any>();

  sendMessage(message: string) {
    this.subject.next({ text: message });
  }

  clearMessages() {
    this.subject.next();
  }

  getMessage(): Observable<any> {
    return this.subject.asObservable();
  }
}

Component.ts

import { Component, OnDestroy } from '@angular/core';
import { Subscription } from 'rxjs';

import { MessageService } from './_services/index';

@Component({
  selector: 'app',
  templateUrl: 'app.component.html'
})

export class AppComponent implements OnDestroy {
  messages: any[] = [];
  subscription: Subscription;

  constructor(private messageService: MessageService) {
    // subscribe to home component messages
    this.subscription = this.messageService.getMessage().subscribe(message => {
      if (message) {
        this.messages.push(message);
      } else {
        // clear messages when empty message received
        this.messages = [];
      }
    });
  }

  ngOnDestroy() {
    // unsubscribe to ensure no memory leaks
    this.subscription.unsubscribe();
  }
}

Reference: http://jasonwatmore.com/post/2019/02/07/angular-7-communicating-between-components-with-observable-subject

Swift_TransportException Connection could not be established with host smtp.gmail.com

firstly,check for gmail SMTP server . you should have to allow access for less secured apps without allowing swift mailer is not possible.for this login in your email account first then go into privacy settings and then click on sign and security then click on apps without access and then make on to less secure apps option then try mailer again, it will work then.

Storing Python dictionaries

To write to a file:

import json
myfile.write(json.dumps(mydict))

To read from a file:

import json
mydict = json.loads(myfile.read())

myfile is the file object for the file that you stored the dict in.

Select all text inside EditText when it gets focus

Why don't you try android:hint="hint" to provide the hint to the user..!!

The "hint" will automatically disappear when the user clicks on the edittextbox. its the proper and best solution.

Apache Prefork vs Worker MPM

Its easy to switch between prefork or worker mpm in Apache 2.4 on RHEL7

Check MPM type by executing

sudo httpd -V

Server version: Apache/2.4.6 (Red Hat Enterprise Linux)
Server built:   Jul 26 2017 04:45:44
Server's Module Magic Number: 20120211:24
Server loaded:  APR 1.4.8, APR-UTIL 1.5.2
Compiled using: APR 1.4.8, APR-UTIL 1.5.2
Architecture:   64-bit
Server MPM:     prefork
  threaded:     no
    forked:     yes (variable process count)
Server compiled with....
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=256
 -D HTTPD_ROOT="/etc/httpd"
 -D SUEXEC_BIN="/usr/sbin/suexec"
 -D DEFAULT_PIDLOG="/run/httpd/httpd.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="conf/mime.types"
 -D SERVER_CONFIG_FILE="conf/httpd.conf"

Now to change MPM edit following file and uncomment required MPM

 /etc/httpd/conf.modules.d/00-mpm.conf 

# Select the MPM module which should be used by uncommenting exactly
# one of the following LoadModule lines:

# prefork MPM: Implements a non-threaded, pre-forking web server
# See: http://httpd.apache.org/docs/2.4/mod/prefork.html
LoadModule mpm_prefork_module modules/mod_mpm_prefork.so

# worker MPM: Multi-Processing Module implementing a hybrid
# multi-threaded multi-process web server
# See: http://httpd.apache.org/docs/2.4/mod/worker.html
#
#LoadModule mpm_worker_module modules/mod_mpm_worker.so

# event MPM: A variant of the worker MPM with the goal of consuming
# threads only for connections with active processing
# See: http://httpd.apache.org/docs/2.4/mod/event.html
#
#LoadModule mpm_event_module modules/mod_mpm_event.so

CSS :selected pseudo class similar to :checked, but for <select> elements

This worked for me :

select option {
   color: black;
}
select:not(:checked) {
   color: gray;
}

Programs & Examples On #Operands

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Adding 'serial' to existing column in Postgres

TL;DR

A non-interactive solution

Using a Function

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subsampling every nth entry in a numpy array

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CSS

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Loop through an array in JavaScript

for (const s of myStringArray) {

}

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