An @ symbol at the beginning of a line is used for class and function decorators: PEP 318: Decorators Python Decorators The most common Python decorators are: @property @classmethod @staticmethod An @ in the middle of a line is probably matrix multiplication: @ as a binary operator.
PHP strings can be specified not just in two ways, but in four ways. Single quoted strings will display things almost completely “as is.” Variables and most escape sequences will not be interpreted. The exception is that to display a literal single quote, you can escape it with a back slash \’, and to display … Read more
JSON does not allow real line-breaks. You need to replace all the line breaks with \n. eg: “first line second line” can saved with: “first line\nsecond line” Note: for Python, this should be written as: “first line\\nsecond line” where \\ is for escaping the backslash, otherwise python will treat \n as the control character “new … Read more
Python doesn’t support ++, but you can do: number += 1
In PowerShell V1 there’s only # to make the text after it a comment. # This is a comment in PowerShell In PowerShell V2 <# #> can be used for block comments and more specifically for help comments. #REQUIRES -Version 2.0 <# .SYNOPSIS A brief description of the function or script. This keyword can be … Read more
That’s more specifically a ternary operator expression than an if-then, here’s the python syntax value_when_true if condition else value_when_false Better Example: (thanks Mr. Burns) ‘Yes’ if fruit == ‘Apple’ else ‘No’ Now with assignment and contrast with if syntax fruit=”Apple” isApple = True if fruit == ‘Apple’ else False vs fruit=”Apple” isApple = False if … Read more
If you really want to use single quotes in the outermost layer, remember that you can glue both kinds of quotation. Example: alias rxvt=”urxvt -fg “”‘”‘#111111′”‘”‘ -bg ‘”‘”‘#111111′”‘” # ^^^^^ ^^^^^ ^^^^^ ^^^^ # 12345 12345 12345 1234 Explanation of how ‘”‘”‘ is interpreted as just ‘: ‘ End first quotation which uses single quotes. … Read more
What is the line? You can just have arguments on the next line without any problems: a = dostuff(blahblah1, blahblah2, blahblah3, blahblah4, blahblah5, blahblah6, blahblah7) Otherwise you can do something like this: if (a == True and b == False): or with explicit line break: if a == True and \ b == False: Check … Read more
A static variable inside a function keeps its value between invocations. A static global variable or a function is “seen” only in the file it’s declared in (1) is the more foreign topic if you’re a newbie, so here’s an example: #include <stdio.h> void foo() { int a = 10; static int sa = 10; … Read more
var intvalue = Math.floor( floatvalue ); var intvalue = Math.ceil( floatvalue ); var intvalue = Math.round( floatvalue ); // `Math.trunc` was added in ECMAScript 6 var intvalue = Math.trunc( floatvalue ); Math object reference Examples Positive // value=x // x=5 5<x<5.5 5.5<=x<6 Math.floor(value) // 5 5 5 Math.ceil(value) // 5 6 6 Math.round(value) // 5 … Read more