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initialize a numpy array
...ly store values, but they need to be have fixed size to obtain this speed. Python lists are designed to be more flexible at the cost of speed and size.
– Justin Peel
Dec 26 '10 at 22:10
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Timeout for python requests.get entire response
...out even if it only slept for ten seconds.
But, it's all in the standard python library! Except for the sleep function import it's only one import. If you are going to use timeouts many places You can easily put the TimeoutException, _timeout and the singaling in a function and just call that. Or ...
How to write PNG image to string with the PIL?
...inal file format, so in this case you can use format=image.format.
In old Python 2 versions before introduction of the io module you would have used the StringIO module instead.
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Cartesian product of x and y array points into single array of 2D points
... shown here were performed on a quad-core machine, running Mac OS 10.12.5, Python 3.6.1, and numpy 1.12.1. Variations on hardware and software are known to produce different results, so YMMV. Run these tests for yourself to be sure!
Definitions:
import numpy
import itertools
from functools import...
The smallest difference between 2 Angles
...ept angles outside the range [0, 2π) you can generalize the above. Here's Python code for the generalized version:
PI = math.pi
TAU = 2*PI
def smallestSignedAngleBetween(x, y):
a = (x - y) % TAU
b = (y - x) % TAU
return -a if a < b else b
Note that the % operator does not behave t...
Check if item is in an array / list
... @jdi, and that loop will run much faster than the one coded explicitly in Python, not to mention being easier to read.
– Mark Ransom
Jun 28 '12 at 19:44
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Split string every nth character?
...you tell it. The above answer is really only just a for loop but expressed pythonically. Also, if you need to remember a "simplistic" answer, there are at least hundreds of thousands of ways to remember them: starring the page on stackoverflow; copying and then pasting into an email; keeping a "help...
Elegant Python function to convert CamelCase to snake_case?
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Personally I am not sure how anything using regular expressions in python can be described as elegant. Most answers here are just doing "code golf" type RE tricks. Elegant coding is supposed to be easily understood.
def to_snake_case(not_snake_case):
final = ''
for i in xrange(len(n...
How to save traceback / sys.exc_info() values in a variable?
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For Python3, exc_tuple[1] (aka value) is the instance of the exception, not the "String passed as parameter". See: docs.python.org/3/library/sys.html#sys.exc_info
– Jinghao Shi
Oct 6 '18 at ...
Split views.py in several files
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In Django everything is a Python module (*.py). You can create a view folder with an __init__.py inside and you still will be able to import your views, because this also implements a Python module. But an example would be better.
Your original views...