number_to_name.py

def number_to_name(number):
    # Convert a number to its corresponding name of the choice.

    # Check the input number:
    if (number == 0):
        return 'rock'
    elif (number == 1):
        return 'Spock'
    elif (number == 2):
        return 'paper'
    elif (number == 3):
        return 'lizard'
    elif (number == 4):
        return 'scissors'
    else:
        return -1 # An invalid number has been entered.