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What's the difference between subprocess Popen and call (how can I use them)?
...e.
subprocess.Popen is more general than subprocess.call.
Popen doesn't block, allowing you to interact with the process while it's running, or continue with other things in your Python program. The call to Popen returns a Popen object.
call does block. While it supports all the same arguments a...
Gradle buildscript dependencies
...
The repositories in the buildScript block are used to fetch the dependencies of your buildScript dependencies. These are the dependencies that are put on the classpath of your build and that you can refer to from your build file. For instance extra plugins that...
Can I implement an autonomous `self` member type in C++?
C++ lacks the equivalent of PHP's self keyword , which evaluates to the type of the enclosing class.
13 Answers
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How do I get the entity that represents the current user in Symfony2?
...ct the Security service via auto-wiring in the controller like this:
<?php
use Symfony\Component\Security\Core\Security;
class SomeClass
{
/**
* @var Security
*/
private $security;
public function __construct(Security $security)
{
$this->security = $securit...
How to create an array of 20 random bytes?
...ecureRandom.getInstanceStrong().nextBytes(bytes);
BUT your threads might block if there is not enough randomness available on the machine, depending on your OS. The following solution will not block:
SecureRandom random = new SecureRandom();
byte[] bytes = new byte[20];
random.nextBytes(bytes);
...
Delete specific line number(s) from a text file using sed?
...ould like to propose a generalization with awk.
When the file is made by blocks of a fixed size
and the lines to delete are repeated for each block,
awk can work fine in such a way
awk '{nl=((NR-1)%2000)+1; if ( (nl<714) || ((nl>1025)&&(nl<1029)) ) print $0}'
OriginFile.dat &...
The difference between the Runnable and Callable interfaces in Java
...able and get your values on future.get (). Here the calling thread will be blocked till the Future comes back with results which in turn is waiting for Callable's call() method to execute.
So think about an interface to a target class where you have both Runnable and Callable wrapped methods define...
Passing parameters to a Bash function
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Knowledge of high level programming languages (C/C++/Java/PHP/Python/Perl ...) would suggest to the layman that bash functions should work like they do in those other languages. Instead, bash functions work like shell commands and expect arguments to be passed to them in the same wa...
Async/await vs BackgroundWorker
...on is just what you are looking for:
Async methods are intended to be non-blocking operations. An await expression in an async method doesn’t block the current thread while the awaited task is running. Instead, the expression signs up the rest of the method as a continuation and returns control t...
Simple calculations for working with lat/lon and km distance?
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If you're using Java, Javascript or PHP, then there's a library that will do these calculations exactly, using some amusingly complicated (but still fast) trigonometry:
http://www.jstott.me.uk/jcoord/
...