Game.py

def beats(a, b):
    tup = ('rock', 'paper', 'scissors')

    # if a == 'paper' and b == 'scissors' or a == 'scissors' and b == 'paper'
    # return 'scissors'
    if (a == tup[1] and b == tup[2]) or (a == tup[2] and b == tup[1]):
        return tup[2]

    # elif a == 'paper' and b == 'rock' or a == 'rock' and b == 'paper'
    # return 'paper'
    elif (a == tup[1] and b == tup[0]) or (a == tup[0] and b == tup[1]):
        return tup[1]

    # elif a == 'rock' and b == 'scissors' or a == 'scissors' and b == 'rock'
    # return 'rock'
    elif (a == tup[0] and b == tup[2]) or (a == tup[2] and b == tup[0]):
        return tup[0]


def players_input():
    name = input('What is your name?: ')
    while True:
        decision = input('Paper, Rock, or Scissors?: ')

        # This will check whether the decision exists in a given tuple.
        # This helps simplify "if x == 5 or x == 3 or x == 1" by putting it into
        # if x in (1, 3, 5)
        if decision.lower() in ('rock', 'paper', 'scissor'):
            break
        else:
            print("Invalid choice! Try again!")
            continue

    return '{} chooses {}'.format(name, decision)


def play():
    player1 = players_input()
    player2 = players_input()

    print('{}\n{}'.format(player1, player2))

    name1, verb, decision1 = player1.split(" ")
    name2, verb, decision2 = player2.split(" ")

    returnvalue = beats(decision1.lower(), decision2.lower())

    if decision1.lower() == returnvalue and decision2.lower() != returnvalue:
        print('{} wins'.format(name1))
    elif decision2.lower() == returnvalue and decision1.lower() != returnvalue:
        print('{} wins'.format(name2))
    else:
        print('It\'s a tie')


def play_again():
    while True:
        choice = input('Do you want to continue?(Y/N): ')
        if choice.upper() == "Y":
            play()
        elif choice.upper() == "N":
            print("Game over")
            break
        else:
            print("Invalid Input! Try again!")


# You should always have this if you're doing unit testing.
if __name__ == '__main__':
    play()
    play_again()