rock_paper_scissors.py

import random

def play(): 
    user = input("What's your choice? p'r' for rock, 'p' for paper, 's' for scissors\n")
    computer = random.choice(['r', 'p', 's'])

    if user == computer:
        return 'It\'s a tie'
    
    # r > s, s > p, p > r
    if is_win(user, computer):
        return 'You won!'
    
    return 'You lose'



def is_win(player, opponent):
    # return true if player wins
    # r > s, s > p, p > r

    if(player == 'r' and opponent == 's') or (player == 's' and opponent == 'p') or (player == 'p' and opponent == 'r'):
        return True

print(play())