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Finding a substring within a list in Python [duplicate]
...import mylist, sub', number=100000)
# for me 7.949463844299316 with Python 2.7, 8.568840944994008 with Python 3.4
timeit.timeit('next((s for s in mylist if sub in s), None)', setup='from __main__ import mylist, sub', number=100000)
# for me 0.12696599960327148 with Python 2.7, 0.09955992100003641 w...
Django DB Settings 'Improperly Configured' Error
...django 1.11.5 and python 3.6 (from the comment this also works with Python 2.7):
import django
import os
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "mysite.settings")
django.setup()
The .py in which you put this code should be in mysite (the parent one)
...
How do I merge a list of dicts into a single dict?
...gt; result
{'a':1,'c':1,'b':2,'d':2}
As a comprehension:
# Python >= 2.7
{k: v for d in L for k, v in d.items()}
# Python < 2.7
dict(pair for d in L for pair in d.items())
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Cannot find module cv2 when using OpenCV
...hese lines in the code:
import sys
sys.path.append('/usr/local/lib/python2.7/site-packages')
or before running the python command in bash move to /usr/local/lib/python2.7/site-packages directory. This is a work around if you don't want to add any thing to the code.
...
vim line numbers - how to have them on by default?
...
vim .vimrc and add the commands you want at open.
Here's a site that explains the vimrc and how to use it.
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Strip spaces/tabs/newlines - python
I am trying to remove all spaces/tabs/newlines in python 2.7 on Linux.
7 Answers
7
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Parse a .py file, read the AST, modify it, then write back the modified source code
...e tree structure and is very helpful in debugging. For example,
On Python 2.7:
>>> import ast
>>> tree = ast.parse("print 'Hello Python!!'")
>>> ast.dump(tree)
"Module(body=[Print(dest=None, values=[Str(s='Hello Python!!')], nl=True)])"
On Python 3.5:
>>> imp...
Why is there no xrange function in Python3?
... using timeit instead of trying to do it manually with time.
First, Apple 2.7.2 64-bit:
In [37]: %timeit collections.deque((x for x in xrange(10000000) if x%4 == 0), maxlen=0)
1 loops, best of 3: 1.05 s per loop
Now, python.org 3.3.0 64-bit:
In [83]: %timeit collections.deque((x for x in range(...
How to create a string with format?
...tring required!
String(format: "Value: %3.2f\tResult: %3.2f", arguments: [2.7, 99.8])
or
String(format:"Value: %3.2f\tResult: %3.2f", 2.7, 99.8)
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