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Finding a substring within a list in Python [duplicate]
...ll lists, it doesn't make a difference, but consider this example:
import timeit
mylist = ['abc123'] + ['xyz123']*1000
sub = 'abc'
timeit.timeit('[s for s in mylist if sub in s]', setup='from __main__ import mylist, sub', number=100000)
# for me 7.949463844299316 with Python 2.7, 8.56884094499400...
Angular JS: What is the need of the directive’s link function when we already had directive’s contro
...d in the controller since this is what is watching the template during run-time.
(4) Finally, controller is also used to be able to communicate among related directives. (Like myTabs example in https://docs.angularjs.org/guide/directive)
(5) It's true that we could've done all this in the link fun...
How can I use threading in Python?
...r() is better style for current Python. Super was relatively recent at the time that I provided this answer, hence calling directly to the super class rather than using super(). I'll update this to use super, though.
– Michael Aaron Safyan
Mar 6 '14 at 11:16
...
Case insensitive 'in'
...ame in USERNAMES) would create only a generator and one needed string at a time - massive memory savings if you're doing this operation a lot. (even more savings, if you simply create a list of lowercase usernames that you reuse for checking every time)
– viraptor
...
How to recursively find the latest modified file in a directory?
...ard for sort to keep everything in memory.
%T@ gives you the modification time like a unix timestamp, sort -n sorts numerically, tail -1 takes the last line (highest timestamp), cut -f2 -d" " cuts away the first field (the timestamp) from the output.
Edit: Just as -printf is probably GNU-only, ajr...
python date of the previous month
...
datetime and the datetime.timedelta classes are your friend.
find today.
use that to find the first day of this month.
use timedelta to backup a single day, to the last day of the previous month.
print the YYYYMM string you're ...
How to avoid explicit 'self' in Python?
...riants of "you can't" or "you shouldn't". While I agree with the latter sentiment, the question is technically still unanswered.
Furthermore, there are legitimate reasons why someone might want to do something along the lines of what the actual question is asking. One thing I run into sometimes is...
How to validate IP address in Python? [duplicate]
...sible leading 0's)
)
(?: # Repeat 0-3 times, separated by a dot
\.
(?:
[3-9]\d?|2(?:5[0-5]|[0-4]?\d)?|1\d{0,2}
|
0x0*[0-9a-f]{1,2}
|
0+[1-3]?[0-7]{0,2}
)
...
Weighted random numbers
... and is less than the sum of the weights
3) go through the items one at a time, subtracting their weight from your random number, until you get the item where the random number is less than that item's weight
Pseudo-code illustrating this:
int sum_of_weight = 0;
for(int i=0; i<num_choices; i++...
Python Image Library fails with message “decoder JPEG not available” - PIL
...ilations. Certainly, it was a very lengthy to pip install things the first time, but then subsequent uninstalls and (re)installs were suspiciously quick. Anyway, the methods above did not work for me until I ran pip install --no-cache-dir pillow. Good luck!
– t-mart
...