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What makes Lisp macros so special?
...bleByTwo = [x for x in range(10) if x % 2 == 0]
yields a list containing all even numbers between 0 and 9. Back in the Python 1.5 days there was no such syntax; you'd use something more like this:
divisibleByTwo = []
for x in range( 10 ):
if x % 2 == 0:
divisibleByTwo.append( x )
Thes...
The Definitive C Book Guide and List
...ackoverflow.com/questions/378437/deleted-question-audit-2018).
Reference (All Levels)
The C Programming Language (2nd Edition) - Brian W. Kernighan and Dennis M. Ritchie (1988). Still a good, short but complete introduction to C (C90, not C99 or later versions), written by the inventor of C. Howe...
jQuery: count number of rows in a table
...
Use a selector that will select all the rows and take the length.
var rowCount = $('#myTable tr').length;
Note: this approach also counts all trs of every nested table!
share
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How to effectively work with multiple files in Vim
...e and close a tab, you can also use ZZ instead of :wq (just like would normally save and close)
– Andreas Grech
May 5 '10 at 14:34
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When should I use std::thread::detach?
... completes. This is easy to understand, but what's the difference between calling detach() and not calling it?
5 Answers
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Spinlock versus Semaphore
...ck (or, the other way around, a lock is a special case of a semaphore). Usually, but not necessarily, spinlocks are only valid within one process whereas semaphores can be used to synchronize between different processes, too.
A lock works for mutual exclusion, that is one thread at a time can acqui...
Extract a regular expression match
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Use the new stringr package which wraps all the existing regular expression operates in a consistent syntax and adds a few that are missing:
library(stringr)
str_locate("aaa12xxx", "[0-9]+")
# start end
# [1,] 4 5
str_extract("aaa12xxx", "[0-9]+")
# [1]...
How do I use method overloading in Python?
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It's method overloading not method overriding. And in Python, you do it all in one function:
class A:
def stackoverflow(self, i='some_default_value'):
print 'only method'
ob=A()
ob.stackoverflow(2)
ob.stackoverflow()
You can't have two methods with the same name in Python -- ...
How bad is shadowing names defined in outer scopes?
I just switched to Pycharm and I am very happy about all the warnings and hints it provides me to improve my code. Except for this one which I don't understand:
...
When creating HTML emails, should we use html, head, body tags?
In my email views, I usually just do something like...
6 Answers
6
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