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defaultdict of defaultdict?
...et as the new value of this key, which means in our case the value of d[Key_doesnt_exist] will be defaultdict(int).
If you try to access a key from this last defaultdict i.e. d[Key_doesnt_exist][Key_doesnt_exist] it will return 0, which is the return value of the argument of the last defaultdict i....
How to check if an object is an array?
...e jQuery.isArray(obj) or $.isArray(obj). If you use underscore you can use _.isArray(obj)
If you don't need to detect arrays created in different frames you can also just use instanceof
obj instanceof Array
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How to save a Python interactive session?
...for your use-case there is the %save magic command, you just input %save my_useful_session 10-20 23 to save input lines 10 to 20 and 23 to my_useful_session.py (to help with this, every line is prefixed by its number).
Furthermore, the documentation states:
This function uses the same syntax as...
how to show lines in common (reverse diff)?
...u could also try with perl (credit goes here)
perl -ne 'print if ($seen{$_} .= @ARGV) =~ /10$/' file1 file2
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Changing specific text's color using NSMutableAttributedString in Swift
...and end index of the coloured-to-be characters in the string e.g.
var main_string = "Hello World"
var string_to_color = "World"
var range = (main_string as NSString).rangeOfString(string_to_color)
Then you convert to attributed string and use 'add attribute' with NSForegroundColorAttributeName:
...
Real-world examples of recursion [closed]
... }
else{
System.out.println("\n" + indentation + "|_" +currentDirOrFile.getName());
indentation.append(" ");
for ( String currentFileOrDirName : currentDirOrFile.list()){
getPrivateDirectoryContent(currentDirOrFile + "\\" + currentFi...
Find a value in an array of objects in Javascript [duplicate]
...
array.find(x => x.name === 'string 1')
http://exploringjs.com/es6/ch_arrays.html#_searching-for-array-elements
https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/find
To then replace said object (and use another cool ES6 method fill) you could do something li...
Running a Python script from PHP
...ntu Server 10.04. I hope it helps you also on Arch Linux.
In PHP use shell_exec function:
Execute command via shell and return the complete output as a string.
It returns the output from the executed command or NULL if an error
occurred or the command produces no output.
<?php
$co...
Is it possible to break a long line to multiple lines in Python [duplicate]
... line
appropriately.
Example of implicit line continuation:
a = some_function(
'1' + '2' + '3' - '4')
On the topic of line-breaks around a binary operator, it goes on to say:-
For decades the recommended style was to break after binary operators.
But this can hurt readability in t...
Merge / convert multiple PDF files into one PDF
...eir order is preserved by "*". If its not preserved, using ranges: filename_{0..9}.pdf solves it.
– lepe
Jan 5 '15 at 5:48
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