paul j3 added the comment:
One way to reduce the testing burden, and to be extra safe regarding backward
compatibility is to make this action optional, rather than the default.
For example, make `_prog_name` importable (i.e. change the name), and then
expect the user to use it explicitly with:
parser = argparse.ArgumentParser(prog=argparse.prog_name(), ...)
and leave the `parse_args` stack unchanged.
This would require an addition to the documentation. The user can then check
for themselves whether `prog_name` gets the right name, given their packaging
and calling method. It's a little more work for a package creator, but
arguably it's a good thing to aware of.
The added tests, if any, can focus on the output of this function, rather than
the output of the 'print_help'.
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<http://bugs.python.org/issue22240>
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