rock-paper-scissors.py

# Rock, Paper, Scissors command line python3 game
# run at commandline by typing `python rock-paper-scissors.py`

from random import randint                      # import random for computer choice
                                               
class NotAChoiceException(Exception):           # creating a custom exception to handle by inputs
    """doc statement about error"""
    pass
                                     
def takeInput():                                # the function that handles input
    nb = input('Enter 0, 1 or 2: ')             # waits for user input
    try:                                        # try is for places where you check for errors  
        choice = int(nb)                        # converts input string to integer
        if choice > 2:                          # if number too high, throw custom exception
            raise NotAChoiceException
        return choice                           # else return our choice to where function was called
    except (ValueError, NotAChoiceException):   # catches if user input is not a number or number greater than 2
        print("I need a number 0 - Rock, 1 - Paper or 2 - Scissors") 
        return takeInput()                      # calls itself to start over 
        
def playAgain():
    ans = str(input('Play again (Y/N): '))      # take input
    try:
        if ans.lower() in ("y", "yes"):         # if lowercased answer is in y, yes
            main()                              # call main function again, start over
        if ans.lower() in ("n", "no"):          # lowercased answer is n or no
            print("Thanks, bye!")               # be courteous
            exit()                              # and exit
        else:
            raise NotAChoiceException
    except NotAChoiceException:
        print("Y/N please")
        playAgain()
 
# using """ for multiline string
print("""Hello, this is Rock, Paper, Scissors.
The rules are easy. You pick Rock, Paper or Scissors and the computer will pick one as well.
Rock beats Scissors, Scissors beats Paper and Paper beat Rock
Type 0 for Rock, 1 for Paper or 2 for Scissors.""")          
 
computer_score = 0                                    # initialize score
user_score = 0                                        # initialize score

def main():
    computer_choice = randint(0,2)                    # computer choice is random int 0-2
    user_choice = takeInput()                         # calling takeInput() to handle users choice
    global user_score, computer_score                 # using global scope scores
    
    # Rules here..
    rps = ["Rock", "Paper", "Scissors"]               # array for names indexed to 0,1,2

    if user_choice == computer_choice:                # case where there's a draw
        print("Draw - User and Computer both picked {0}".format(rps[user_choice]))
        
    elif user_choice == 0 and computer_choice == 2:   # else if handle rock beats scissors
        print("Human wins - Rock beats computer's Scissors")
        user_score += 1                               # increment score for human
        
    elif computer_choice == 0 and user_choice == 2:   # handle case where rock beats scissors for computer
        print("Computer wins - Rock beats human's Scissors")
        computer_score += 1
        
    elif user_choice > computer_choice:               # otherwise 2 beats 1 and 1 beats 0, greater number wins.
        print("Human wins with {} beating computers {}".format(rps[user_choice], rps[computer_choice]))
        user_score += 1
        
    elif user_choice < computer_choice:
        print("Computer wins with {} beating humans {}".format(rps[computer_choice], rps[user_choice]))
        computer_score += 1
    
    print("H:{}, C:{}".format(user_score, computer_score))
    playAgain()                                       # calls function to ask to play again
    
if __name__ == "__main__":
    main()                                            # the programs entry point, calls the main() function

you made yours way more in depth than mine lol i can learn a lot from this, much appreciated

nice