When creating a ArgumentParser on which we attach a subparser with different options and then add a nargs="+" argument to the initial parser, the command format string generated does not match the behavior.

for example it would generate :
argparse_error.py [-h] {ls,du} ... vm [vm ...]

but only accept one vm.

I would suspect a bug when parsing the arguments (as the help meets the desired behavior).

Attached is a little script to reproduce the error.

Thank you !