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Import Error: No module named numpy
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You can simply use
pip install numpy
Or for python3, use
pip3 install numpy
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Shuffling a list of objects
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#!/usr/bin/python3
import random
s=list(range(5))
random.shuffle(s) # << shuffle before print or assignment
print(s)
# print: [2, 4, 1, 3, 0]
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ImportError: DLL load failed: %1 is not a valid Win32 application. But the DLL's are there
...elped. I am not sure what was wrong. I had a version of opencv, anaconda3, python3. Installed opencv_python-3.3.0+contrib-cp35-cp35m-win_amd64 from above package list and was able to import cv2 successfully after hours of struggle. Thanks a ton.
– emeralddove
S...
How do I convert seconds to hours, minutes and seconds?
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@medley56 When using Python3, you need to use str() if you are going use a format such as 0>8: "{:0>8}".format(str(datetime.timedelta(seconds=666777))). Check this answer for more info.
– Berriel
Sep 1...
Compiling with g++ using multiple cores
...rary/multiprocessing.html#multiprocessing.cpu_count
Like this:
make -j $(python3 -c 'import multiprocessing as mp; print(int(mp.cpu_count() * 1.5))')
If you're asking why 1.5 I'll quote user artless-noise in a comment above:
The 1.5 number is because of the noted I/O bound problem. It is a r...
Exif manipulation library for python [closed]
...cement for pyexiv2, which only supports
Python 2.
So, both Python2 and Python3 are now supported by GExiv2.
Good news.
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Import a file from a subdirectory?
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underscores => python3 (too late for editing the comment)
– Alexander Stohr
Mar 11 at 14:22
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Python strftime - date without leading 0?
...ormat(dt=datetime.datetime.now())
'Wednesday December 3, 2014'
And as of python3.6, this can be expressed as an inline formatted string:
Python 3.6.0a2 (v3.6.0a2:378893423552, Jun 13 2016, 14:44:21)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "lic...
Reload Flask app when template file changes
...ing with jinja templates, you need to set some parameters. In my case with python3, I solved it with the following code:
if __name__ == '__main__':
app.jinja_env.auto_reload = True
app.config['TEMPLATES_AUTO_RELOAD'] = True
app.run(debug=True, host='0.0.0.0')
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Print a list in reverse order with range()?
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In Python3, reversed does not accept generators in general but it accepts range. Why would reversed(range(10000)) need to allocate memory for the whole list? range can return an object that implements the __reversed__ method tha...