[issue22240] argparse support for "python -m module" in help

[Samuel Marks]

Samuel Marks <samuelmarks at gmail.com> added the comment:

Until this is accepted, I've modified my codebase:
```
from argparse import ArgumentParser

ArgumentParser(
  prog=None if globals().get('__spec__') is None else 'python -m {}'.format(__spec__.name.partition('.')[0])
)
```

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nosy: +samuelmarks

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue22240>
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