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How do you properly determine the current script directory in Python?
...er? According to this: stackoverflow.com/a/18489147 answer a cross-platform solution is abspath(getsourcefile(lambda:0))? Or is there something else I'm missing?
– Jeff Ellen
Jul 12 '18 at 6:04
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Declare and initialize a Dictionary in Typescript
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Always forget this syntax for some reason!
– eddiewould
Jul 31 '18 at 4:04
16
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Referring to the null object in Python
...on, the 'null' object is the singleton None.
The best way to check things for "Noneness" is to use the identity operator, is:
if foo is None:
...
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Python argparse mutual exclusive group
...It makes options within the group mutually exclusive.
What you're looking for is subcommands. Instead of prog [ -a xxxx | [-b yyy -c zzz]], you'd have:
prog
command 1
-a: ...
command 2
-b: ...
-c: ...
To invoke with the first set of arguments:
prog command_1 -a xxxx
To invok...
How to add a progress bar to a shell script?
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for printf we would have to use this format: printf "#### (50%%)\r", it wouldn't work with single quotes and percent sign needs to be escaped.
– nurettin
Sep 10 '13 at 9:55
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Windows下如何判断Win32 or x64？ - C/C++ - 清泛网 - 专注C/C++及内核技术
...l.exe/ml64.exe）内部定义的。具体描述是
_WIN32：Defined for applications for Win32 and Win64. Always defined.
_WIN64：Defined for applications for Win64.
下面看一段程序：（分别在 Win32 和 x64 配置下运行一次）
#include <iostream>
using namespace st...
namedtuple and default values for optional keyword arguments
...Node' = None
>>> Node()
Node(val=None, left=None, right=None)
Before Python 3.7
Set Node.__new__.__defaults__ to the default values.
>>> from collections import namedtuple
>>> Node = namedtuple('Node', 'val left right')
>>> Node.__new__.__defaults__ = (None,) ...
How to determine the version of the C++ standard used by the compiler?
...here is no overall way to do this. If you look at the headers of cross platform/multiple compiler supporting libraries you'll always find a lot of defines that use compiler specific constructs to determine such things:
/*Define Microsoft Visual C++ .NET (32-bit) compiler */
#if (defined(_M_IX86) &a...
What is Autoloading; How do you use spl_autoload, __autoload and spl_autoload_register?
...o a stack/queue and call sequentially when a "new Class" is declared.
So for example:
spl_autoload_register('myAutoloader');
function myAutoloader($className)
{
$path = '/path/to/class/';
include $path.$className.'.php';
}
//-------------------------------------
$myClass = new MyClass...
How can I change the color of pagination dots of UIPageControl?
...view:pageControl];
Header file:
//
// PageControl.h
//
// Replacement for UIPageControl because that one only supports white dots.
//
// Created by Morten Heiberg <morten@heiberg.net> on November 1, 2010.
//
#import <UIKit/UIKit.h>
@protocol PageControlDelegate;
@interface PageC...