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How can I reverse a list in Python?
...cing, such as range(1,4)[::-1], reversed() is easier to read, runs faster, and uses substantially less memory. "
– Jim Oldfield
Aug 20 '16 at 15:55
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How to sort in-place using the merge sort algorithm?
...s the array xs, the two sorted sub-arrays are represented as ranges [i, m) and [j, n) respectively. The working area starts from w. Compare with the standard merge algorithm given in most textbooks, this one exchanges the contents between the sorted sub-array and the working area. As the result, the...
How to delete the contents of a folder?
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If you're working with a very large directory, and particularly a network directory on windows, and you can control the environment in which this program runs, it might be worth using Py3.5's "os.scandir(folder)" function instead of listdir. The syntax is quite different ...
How to delete a file or folder?
...os.rmdir() removes an empty directory.
shutil.rmtree() deletes a directory and all its contents.
Path objects from the Python 3.4+ pathlib module also expose these instance methods:
pathlib.Path.unlink() removes a file or symbolic link.
pathlib.Path.rmdir() removes an empty directory.
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How do I shutdown, restart, or log off Windows via a bat file?
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The most common ways to use the shutdown command are:
shutdown -s — Shuts down.
shutdown -r — Restarts.
shutdown -l — Logs off.
shutdown -h — Hibernates.
Note: There is a common pitfall wherein users think -h means "help" (which it does for every other comman...
How can I pass a list as a command-line argument with argparse?
I am trying to pass a list as an argument to a command line program. Is there an argparse option to pass a list as option?
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Concatenating two lists - difference between '+=' and extend()
... Maybe the difference has more implications when it comes to ducktyping and if your maybe-not-really-a-list-but-like-a-list supports .__iadd__()/.__add__()/.__radd__() versus .extend()
– Nick T
Dec 15 '14 at 22:21
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Rename multiple files in a directory in Python [duplicate]
... Im getting an error from windows saying it cant find the file, and it's not doing anything...any tips?
– Jeff
May 3 '10 at 15:49
5
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How to access environment variable values?
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print(os.environ.get('KEY_THAT_MIGHT_EXIST'))
# os.getenv is equivalent, and can also give a default value instead of `None`
print(os.getenv('KEY_THAT_MIGHT_EXIST', default_value))
Python default installation on Windows is C:\Python. If you want to find out while running python you can do:
impo...
Dynamically update values of a chartjs chart
I created an basic bar chart using chartjs and it works fine. Now I want to update the values on a time based interval. My problem is that after I created the chart, I do not know how to update its values correctly...
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