python - argparse's "required" ignored in the help screen? -


consider following code:

import argparse parser = argparse.argumentparser() parser.add_argument('-o', required=true, nargs=1) parser.parse_args(['-h'])

why getting following output if said -o required?

usage: test.py [-h] -o o  optional arguments:   -h, --help  show message , exit   -o o

i expect text -o required.

this issue #9694 on python bug tracker, yet unfixed. can read more there. note usage line correctly indicate switch required (if weren't, usage line read usage: test.py [-h] [-o o] instead of usage: test.py [-h] -o o).

for working around it, can use argument groups can given title. example shows @ linked page, allows create groups choice of name instead of default positional arguments , optional arguments groupings.


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