[issue42023] Argparse: Add a "display" arg

[ThatXliner]

ThatXliner <bryan.hu.2020 at gmail.com> added the comment:

>However, I can imagine adding a variable that gives the user full control over the action-invocation.  In:

    argparse.HelpFormatter._format_action_invocation method.

That's what I'm trying to change. If there was a public API/method for manipulating the left side of the help menu.

  (This part)     (Manipulatable via help=)

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<https://bugs.python.org/issue42023>
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