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Repeat string to certain length
... Python 2.2. You only have to use it in Python 3 (or in modules that have from __future__ import division) but you can use it regardless.
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How do you split a list into evenly sized chunks?
...unks you want:
def chunks(lst, n):
"""Yield successive n-sized chunks from lst."""
for i in range(0, len(lst), n):
yield lst[i:i + n]
import pprint
pprint.pprint(list(chunks(range(10, 75), 10)))
[[10, 11, 12, 13, 14, 15, 16, 17, 18, 19],
[20, 21, 22, 23, 24, 25, 26, 27, 28, 29]...
How to track down a “double free or corruption” error
...ram to abort at the point where the double free is done.
You can set this from gdb by using the set environment MALLOC_CHECK_ 2 command before running your program; the program should abort, with the free() call visible in the backtrace.
see the man page for malloc() for more information
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Python xml ElementTree from a string source?
The ElementTree.parse reads from a file, how can I use this if I already have the XML data in a string?
4 Answers
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Generate random numbers with a given (numerical) distribution
...0.2])
If you are using Python 3.6 or above, you can use random.choices() from the standard library – see the answer by Mark Dickinson.
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What's to stop malicious code from spoofing the “Origin” header to exploit CORS?
The way I understand it, if a client-side script running on a page from foo.com wants to request data from bar.com, in the request it must specify the header Origin: http://foo.com , and bar must respond with Access-Control-Allow-Origin: http://foo.com .
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Odd behavior when Java converts int to byte?
... bit (and we set the sign bit to 0 which is positive), the original 8 bits from the byte are read by Java as a positive value.
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Converting RGB to grayscale/intensity
When converting from RGB to grayscale, it is said that specific weights to channels R, G, and B ought to be applied. These weights are: 0.2989, 0.5870, 0.1140.
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Bin size in Matplotlib (Histogram)
...e lower bin edges and the +1 gives the upper edge of the last bin.
Code:
from numpy import np; from pylab import *
bin_size = 0.1; min_edge = 0; max_edge = 2.5
N = (max_edge-min_edge)/bin_size; Nplus1 = N + 1
bin_list = np.linspace(min_edge, max_edge, Nplus1)
Note that linspace produces array f...
How to determine CPU and memory consumption from inside a process?
I once had the task of determining the following performance parameters from inside a running application:
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