run.py

import sys


class Switch(object):
    def auto(self):
        print("auto")

    def mal(self):
        print("mal")

    def default(self):
        print("default")


if __name__ == "__main__":
    command = "auto"
    if len(sys.argv) > 1:
        command = sys.argv[1].lower()

    switch = Switch()

    # getattr(switch, command)()

    switcher = {
        "auto": switch.auto,
        "mal": switch.mal,
    }
    switcher.get(command, switch.default)()