Sys.argv

The sys module is used to access command-line parameters. The len(sys.argv) function contains the number of arguments. To print all of the arguments, simply execute str(sys.argv). Let's have a look at an example: 

01.py
import sys
print('Number of arguments:', len(sys.argv))
print('Argument list:', str(sys.argv))

Output:
Python3 01.py img
Number of arguments 2
Arguments list: ['01.py', 'img']