如何将未定义数量的可选参数/参数传递给 python 3 脚本

Question

I need to pass 3 obligatory parameters when executing a python script but the program also can receive a undefined number of paramters always greater than 3 for example

my_prgoram.py 1 2 3 4 5 6

and also

my_prgoram.py 1 2 3 4 

I'm trying to do this with the argparse module so far I have this

import argparse

if __name__ == '__main__':
    # Initialize the parser
    parser = argparse.ArgumentParser(
        description="how to run the script: [my_prgoram.py 3 4 5 7 [n]... ] 
    )

# Add the positional parameter
parser.add_argument('first', help="number of cards")
parser.add_argument('cvaluen1', type=int, help="the first value")
parser.add_argument('cvaluen2', type=int, help="the second value")

# Parse the arguments
arguments = parser.parse_args()

# Finally print the passed string
print(arguments.first)
print(arguments.cvaluen1)
print(arguments.cvaluen2)

Answer 1

It might be easier to use argv instead of argparse and it will also be more portable:

import sys

num_args = len(sys.argv)
if num_args  >= 4:
   first_arg = sys.argv[1]
   second_arg = sys.argv[2]
   third_arg = sys.argv[3]
   if num_args > 4:
      other_args = [arg for arg in args[4:]]

Answer 2

ArgumentParser.parse_known_args() might be of help:

>>> parser.parse_known_args('1 2 3 4 5 6'.split(' '))
(Namespace(cvaluen1=2, cvaluen2=3, first='1'), ['4', '5', '6'])