Make metavar in argparse be Optional. #2739
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yedpodtrzitko
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The default value of metavar in
argparse.ActionisNone, thereforeargparse.Action.metavarand the metavar argument ofargparse.ArgumentParser.add_argumentshould beOptional.https://github.com/python/cpython/blob/master/Lib/argparse.py#L809
https://github.com/python/cpython/blob/2.7/Lib/argparse.py#L779