paul j3 <ajipa...@gmail.com> added the comment:

https://docs.python.org/3/library/argparse.html#customizing-file-parsing

in the docs describes how to customize the @file reading.  This particular 
extension handles several strings on a line, but that's not the limit of what 
you could do.

You can also read a file before parsing and construct a custom `argv` list, as 
described in https://docs.python.org/3/library/argparse.html#beyond-sys-argv

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<https://bugs.python.org/issue42677>
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