[issue42105] allow_abbrev not working as intended in "argparse.ArgumentParser" in Python 3.9.0

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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nosy: +paul.j3, rhettinger

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42105>
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