When you run xgettext other argparse.py, you get this warning:
“'msgid' format string with unnamed arguments cannot be properly localized: The translator cannot reorder the arguments.  Please consider using a format string with named arguments, and a mapping instead of a tuple for the arguments.”

I don’t know if people already rely on strings from argparse, but for safety I think we should change them only in 3.2, if Steven agrees.

(I have to check other stdlib modules.)