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Algorithm to return all combinations of k elements from n
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May I present my recursive Python solution to this problem?
def choose_iter(elements, length):
for i in xrange(len(elements)):
if length == 1:
yield (elements[i],)
else:
for next in choose_iter(elements[i+1...
Regex doesn't work in String.matches()
...ly C++ has an equivalent set of methods - regex_search and regex_match. In Python, re.match only anchors the match at the start of the string (as if it were \Apattern) and Python 3.x has got a nice .fullmatch() method. In JS, Go, PHP and .NET, the there are no regex methods that anchor the match imp...
How can I check the extension of a file?
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Use pathlib From Python3.4 onwards.
from pathlib import Path
Path('my_file.mp3').suffix == '.mp3'
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How to form tuple column from two columns in Pandas
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in python3, you have to use list. This should work: df['new_col'] = list(zip(df.lat, df.long))
– paulwasit
Nov 2 '16 at 8:06
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Converting Epoch time into the datetime
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see docs.python.org/2/library/time.html#time.strftime for more info in the format string
– georg
Jul 27 '13 at 21:01
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How to get numbers after decimal point?
...odulo division approach in multiple languages, whereas the above answer is Python-specific.
– Stew
Feb 3 '15 at 20:17
3
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Can I force pip to reinstall the current version?
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--force-reinstall
doesn't appear to force reinstall using python2.7 with pip-1.5
I've had to use
--no-deps --ignore-installed
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Reading JSON from a file?
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In python 3, we can use below method.
Read from file and convert to JSON
import json
from pprint import pprint
# Considering "json_list.json" is a json file
with open('json_list.json') as fd:
json_data = json.load(fd)
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Hexadecimal To Decimal in Shell Script
...le 'print hex("FF");'
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with printf :
$ printf "%d\n" 0xFF
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with python:
$ python -c 'print(int("FF", 16))'
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with ruby:
$ ruby -e 'p "FF".to_i(16)'
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with node.js:
$ nodejs <<< "console.log(parseInt('FF', 16))"
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with rhino:
$ rhino<<EOF
print(parseInt('FF',...
How can I save an image with PIL?
I have just done some image processing using the Python image library (PIL) using a post I found earlier to perform fourier transforms of images and I can't get the save function to work. The whole code works fine but it just wont save the resulting image:
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