[issue39467] Allow to deprecate CLI arguments in argparse

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

IMHO, cli should only support atomic function.What is atomic functin? (if downstream software's feature can not keep alive without upstream fucntion, it must be an atomic function).

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nosy: +shihai1991 -4383

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<https://bugs.python.org/issue39467>
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