argparse_example.py

import argparse


def my_func(arg1, arg2, arg3=None):
    print(arg1, type(arg1))
    print(arg2, type(arg2))
    print(arg3, type(arg3))

    if arg3:
        print("The boolean value of arg3 is <True>")
    else:
        print("The boolean value of arg3 is <False>")


def parse_arguments():
    parser = argparse.ArgumentParser(description="A pure python 'search & replace' script.")
    parser.add_argument("--integer", default=0, type=int, help="An integer argument")
    parser.add_argument("--float", default=0.0, type=float, help="A float argument")

    # Do, notice that we don't have a default value for "mypath"
    # So what value will it have?
    parser.add_argument("--mypath", type=str, help="The path to a file")

    args = parser.parse_args()
    return args


def main():
    args = parse_arguments()
    my_func(arg1=args.integer, arg2=args.float, arg3=args.mypath)


if __name__ == "__main__":
    main()