Simple Rock, Paper, Scissors

This Rock, Paper, Scissors tutorial was made using the ‘random’ module package from the python standard library and is played using the terminal.

Working out the logic of who wins what is a good first step, since everything about this games logic will use it.
1. rock wins scissors
2. paper wins rock
3. scissors wins paper
It’s also a good idea to create a boolean where we keep track of the running state of the game, to easily replay the game without relaunching.

print("Welcome to Rock, Paper, Scissors!")

running = False

def did_win(computer_choice, user_choice):
    if user_choice == "rock" and computer_choice == "scissors":
        return True
    elif user_choice == "scissors" and computer_choice == "paper":
        return True
    elif user_choice == "paper" and computer_choice == "rock":
        return True
    return False

Now that our game knows the underlying logic, we can build out the rest.

keeping an array that stores all of the possible options is a great way to save space, we know which word is at which index so we

def gameplay():
    # play options :
    options = ["rock", "paper", "scissors"]
    # make computer choose randomly
    computer_choice = random.choice(options)

    user_choice = input("Type your choice: ROCK, PAPER or SCISSORS")
    user_choice = user_choice.lower()

    if computer_choice == user_choice:
        print("ITS A TIE!")
        replay()
    elif did_win(computer_choice, user_choice):
        print("YOU WON")
        print("Computer Choice: " + computer_choice)
        print("Your Choice: " + user_choice)
        replay()
    else:
        print("YOU LOST!")
        print("Computer Choice: " + computer_choice)
        print("Your Choice: " + user_choice)
        replay()

At the end of all of this, we can make use of our running boolean and choose whether or not to replay the game.

def yesno():
    global running
    if response == "y":
        running = True
    elif response == "n":
        print("GOODBYE")
        sys.exit()
    else:
        print("Enter either Y or N")

def replay():
    global response
    response = input("Do you want to play again? (Y/N)?")
    yesno()

Finally, with all of the logic in place and working we can initialize a game. Because we created a different response on startup than on replay we should also let the program know which one to call first. Time to wrap up our program!

def initial():
    global running
    global response
    response = input("Would you like to play a game? (Y/N)")
    response = response.lower()
    yesno()

Start/Stop Gameplay:

while True:
    if running:
        gameplay()
    else:
        initial()

Run your python script in your terminal, and play until you are satisfied with the results!

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