#!/usr/bin/python3 import sys # (1) import #print(sys.argv) #print(len(sys.argv)) # let's say we wanted to run the program # ./args.py 3 + # (2) make sure enough arguments, if not print usage statement if len(sys.argv) < 4 or sys.argv[2] != '+': print("Usage: ./args.py n1 + n2") sys.exit() # (3) use sys.argv[whatever], convert if needed n1 = int(sys.argv[1]) n2 = int(sys.argv[3]) print(n1, '+', n2, '=', n1+n2)