New submission from Leonid Ilyevsky <lilyev...@gmail.com>:

In my script I have a positional argument with list of choices, and that list 
is pretty long. The help formatter shows it as one long line,  list in curly 
brackets, comma-separated. This is very difficult to look at and find the 
choice I need.
It would be nice to have an option to print the choices list one per line.

----------
components: Library (Lib)
messages: 367524
nosy: Leonid Ilyevsky
priority: normal
severity: normal
status: open
title: argparse choices formatter
type: behavior

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40420>
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