export_params.py

import sys

def main(argv):
    print (argv)
  
if __name__ == '__main__':
    # The first argument is how we were called.
    called_as = sys.argv[0]
    # Pass actual arguments to our main function.
    main(sys.argv[1:])

notes.rst

This python Tutorial might sound super noobish but it is very helpful.  I reference it as well as the actual library reference pretty often when I am lucky enough to be writing code.

Language Basics / Tutorial

https://docs.python.org/3/tutorial/

Library Reference

https://docs.python.org/3/library/index.html

This is the python argument parsing library I was talking about:

https://docs.python.org/3/howto/argparse.html

I guess if you have only required arguments then it would be overkill. 

shell.txt

bobcat@liveoak ~ $ python3 export_params.py 
[]
bobcat@liveoak ~ $ python3 export_params.py out.json
['out.json']
bobcat@liveoak ~ $ python3 export_params.py 1 2 3 4 5
['1', '2', '3', '4', '5']
bobcat@liveoak ~ $