[issue37030] Lib/cmd.py: Hide undocumented commands in help and completenames

[Aldwin Pollefeyt]

Change by Aldwin Pollefeyt <aldwinaldwin at gmail.com>:


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keywords: +patch
pull_requests: +13450
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37030>
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