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How do I use regex in a SQLite query?
...sage. If a application-defined SQL function named "regexp" is added at run-time, that function will be called in order to implement the REGEXP operator. (sqlite.org/lang_expr.html#regexp)
– radicand
Jan 7 '12 at 0:49
...
String concatenation vs. string substitution in Python
...here's no option but to use interpolation/templating.
>>> import timeit
>>> def so_q_sub(n):
... return "%s%s/%d" % (DOMAIN, QUESTIONS, n)
...
>>> so_q_sub(1000)
'http://stackoverflow.com/questions/1000'
>>> def so_q_cat(n):
... return DOMAIN + QUESTIONS + '/' ...
How to use double or single brackets, parentheses, curly braces
... square brackets seem to evaluate quite a lot quicker than single ones.
$ time for ((i=0; i<10000000; i++)); do [[ "$i" = 1000 ]]; done
real 0m24.548s
user 0m24.337s
sys 0m0.036s
$ time for ((i=0; i<10000000; i++)); do [ "$i" = 1000 ]; done
real 0m33.478s
user 0m33.478s
sys 0m0....
How can I run an external command asynchronously from Python?
... polling like in the following:
from subprocess import Popen, PIPE
import time
running_procs = [
Popen(['/usr/bin/my_cmd', '-i %s' % path], stdout=PIPE, stderr=PIPE)
for path in '/tmp/file0 /tmp/file1 /tmp/file2'.split()]
while running_procs:
for proc in running_procs:
retcode...
How to disassemble one single function using objdump?
...
The man page isn't definitive. For a long time it wasn't really maintained, but now I think it's generated from the main docs. Also "gdb --help" is more complete now too.
– Tom Tromey
Oct 18 '14 at 2:33
...
Code for a simple JavaScript countdown timer?
I want to use a simple countdown timer starting at 30 seconds from when the function is run and ending at 0. No milliseconds. How can it be coded?
...
What do numbers using 0x notation mean?
...(base 16).0x6400 represents 25600.
To convert,
multiply the last digit times 1
add second-last digit times 16 (16^1)
add third-last digit times 256 (16^2)
add fourth-last digit times 4096 (16^3)
...and so on
The factors 1, 16, 256, etc. are the increasing powers of 16.
0x6400 = (0*1) + (0*...
Should all jquery events be bound to $(document)?
...t control, you cannot do that with delegated event handling because by the time the event bubbles up to the delegated handler, it has already been processed by the input control and it's too late to influence that behavior.
Here are times when event delegation is required or advantageous:
When th...
Using Emacs to recursively find and replace in text files not already open
...ll prompt you for each modified file, so you only have to hit 'y' multiple times.
– danielpoe
Jun 3 '09 at 13:17
50
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How to use SVN, Branch? Tag? Trunk?
...t would be a problem having to re-do it if the modifications got lost; sometimes I commit every 15 minutes or so, other times it might be days (yes, sometimes it takes me a day to write 1 line of code)
-- we use branches, as one of your earlier answers suggested, for different development paths; ri...