Python: OSError: [Errno 2] No such file or directory: ”

Have you noticed that you don’t get the error if you run

python ./script.py

instead of

python script.py

This is because sys.argv[0] will read ./script.py in the former case, which gives os.path.dirname something to work with. When you don’t specify a path, sys.argv[0] reads simply script.py, and os.path.dirname cannot determine a path.

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