jackie_example.py

import sys

def command1(option1="Undefined", option2="Undefined"):
    print("This is command1 with " + option1 + " and " + option2)

def command2(option1="Undefined", option2="Undefined"):
    print("This is command2 with " + option1 + " and " + option2)

commands = {'cmd1': command1, 'cmd2': command2}

while True:
    userInputraw=str(input("Please input a Command: "))
    if userInputraw:
        userInput=userInputraw.split(" ")
        if userInput[0]=="quit":
            print("Bye!")
            sys.exit()
        elif userInput[0] in commands:
            try:
                commands[userInput[0]](*userInput[1:])
            except TypeError:
                print("That was too many command options, try again")
                continue
        else:
            print("Not a valid command")