Illustrating sys.argv in python

example.py

"""
This script illustrates how to use sys.argv to
capture command-line arguments.

Dowload & run this file like so:

    python example.py

OR like this:

    python example.py hello

OR like this:

    python example.py one two 3 4 yippee!


"""
import sys  # We must import sys in order to use it.


if __name__ == "__main__":
    # All of the arguments provided to this script will be
    # contained in a variable called: sys.argv
    print(f"sys.argv = {sys.argv}")

    # it's a list, so we can find it's lenght:
    num_items = len(sys.argv)
    print(f"There are {num_items} items in sys.argv")

    # Or, we can access individual items (assuming they exist)
    if num_items >= 2:
        item = sys.argv[1]
        print(f"The first argument to this script is: {item}")