Python argparse: Is there a way to specify a range in nargs?

Question

I have an optional argument that supports a list of arguments itself.

I mean, it should support:

• -f 1 2
• -f 1 2 3

but not:

• -f 1
• -f 1 2 3 4

Is there a way to force this within argparse ? Now I'm using nargs="*", and then checking the list length.

Edit: As requested, what I needed is being able to define a range of acceptable number of arguments. I mean, saying (in the example) 2 or 3 args is right, but not 1 or 4 or anything that's not inside the range 2..3

Answer 1

You could do this with a custom action:

import argparse  def required_length(nmin,nmax):     class RequiredLength(argparse.Action):         def __call__(self, parser, args, values, option_string=None):             if not nmin<=len(values)<=nmax:                 msg='argument "{f}" requires between {nmin} and {nmax} arguments'.format(                     f=self.dest,nmin=nmin,nmax=nmax)                 raise argparse.ArgumentTypeError(msg)             setattr(args, self.dest, values)     return RequiredLength  parser=argparse.ArgumentParser(prog='PROG') parser.add_argument('-f', nargs='+', action=required_length(2,3))  args=parser.parse_args('-f 1 2 3'.split()) print(args.f) # ['1', '2', '3']  try:     args=parser.parse_args('-f 1 2 3 4'.split())     print(args) except argparse.ArgumentTypeError as err:     print(err) # argument "f" requires between 2 and 3 arguments