New submission from Neil Godber <njgod...@gmail.com>:

'%' character in help= for argparse causes ValueError: incomplete format. I am 
attempting to use the percentage character in my help string but get the above 
error. Presumably argparse assumes % denotes formatting when this is not the 
case. I have tried f-strings, escape and raw strings, none of which rectify the 
issue. The only solution is that dev's cannot use % character in argpase help 
strings which is something of an oddity.

----------
components: Interpreter Core
messages: 373578
nosy: Neil Godber
priority: normal
severity: normal
status: open
title: '%' character in help= for argparse causes ValueError: incomplete format
type: behavior
versions: Python 3.7

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41289>
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