[issue39197] argparse: title and description for mutually exclusive arg groups

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


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nosy: +rhettinger
title: Support the title and description arguments for mutually exclusive argument groups -> argparse: title and description for mutually exclusive arg groups

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39197>
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