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bpo-12806: Add argparse FlexiHelpFormatter #22129
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  benjaminhwilliams 
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Unfortunately, argparse's proposed FlexiHelpFormatter does not yet exist, see python/cpython#22129.
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Rebase to force CI retest. The "addres sanitizer" test is failing with a timeout, on test_multiprocessing_fork.WithProcessesTestQueue(). It is not likely that this branch contributed to that failure. https://github.com/python/cpython/pull/22129/checks?check_run_id=3033564406
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This adds the FlexiHelpFormatter class to argparse.
It supports wrapping text, while preserving paragraphs. Bullet lists are supported.
There are a number of differences, relative to the latest patch in the issue report:
Tests and documentation are included.
https://pypi.org/project/argparse-formatter/
https://bugs.python.org/issue12806