您可以通过自定义操作来执行此操作：
import argparsedef 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 RequiredLengthparser=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
