[issue45673] argparse error with option with optional value

[paul j3]

paul j3 <ajipanca at gmail.com> added the comment:

https://bugs.python.org/issue9338
argparse optionals with nargs='?', '*' or '+' can't be followed by positionals

As you can see this is an old issue, but still too big for a quick fix.

As a general rule, don't use `nargs` like this where there's ambiguity as to how many values will be allocated to the argument.

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<https://bugs.python.org/issue45673>
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