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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 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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How do I extend a class with c# extension methods?
...Check the full example here
http://www.dotnetreaders.com/articles/Extension_methods_in_C-sharp.net,Methods_in_C_-sharp/201
Example:
class Extension
{
static void Main(string[] args)
{
string s = "sudhakar";
Console.WriteLine(s.GetWordCount());
...
Real-world examples of recursion [closed]
... }
else{
System.out.println("\n" + indentation + "|_" +currentDirOrFile.getName());
indentation.append(" ");
for ( String currentFileOrDirName : currentDirOrFile.list()){
getPrivateDirectoryContent(currentDirOrFile + "\\" + currentFi...
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 can I launch Safari from an iPhone app?
...wers.
import UIKit
class InterAppCommunication {
static func openURI(_ URI: String) {
UIApplication.shared.open(URL(string: URI)!, options: [:], completionHandler: { (succ: Bool) in print("Complete! Success? \(succ)") })
}
}
...
Use dynamic variable names in JavaScript
...s quite easy answer but you make it complex.
// If you want to get article_count
// var article_count = 1000;
var type = 'article';
this[type+'_count'] = 1000; // in a function we use "this";
alert(article_count);
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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...
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...
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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