Julian Berman <julian+python....@grayvines.com> added the comment:

This is documented already I believe:

https://docs.python.org/3/library/argparse.html#help

> As the help string supports %-formatting, if you want a literal % to appear 
> in the help string, you must escape it as %%.

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nosy: +Julian

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<https://bugs.python.org/issue44986>
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