Rock Paper Scissors Implementation

# Amy Luo
# Girls Who Code 2018 SIP Technical Project

import random

# dictionary that converts user play and computer play into English for output
# formatting
CHOICES = {0:'rock', 1:'paper', 2:'scissors'}

# lists the cases in which the computer would win in the format:
#(ai_play, user_play) where 0 = rock, 1 = paper, 2 = scissors
AI_WINS = [(0, 2), (2, 1), (1, 0)]

class RockPaperScissors:
    def __init__(self):
        self.ai_play = None
        self.user_play = None
        self.ai_points = 0
        self.user_points = 0
        
    def _ai_play(self):
        '''Randomly generates the play made by the computer (AI)'''
        self.ai_play = random.randint(0, 2)

def _user_play(self):
        '''Gets play inputted by the user'''
        while True: 
            user = input('Please enter 0 for rock, 1 for paper and 2 for '
                         'scissors: \n')
            # checks input is indeed an integer and is 0, 1 or 2
            if user.isdigit() and 0 <= int(user) <= 2:
                break
            else:
                 print('Invalid Input! Try Again!')
        self.user_play = int(user)

def determine_winner(self):
        '''Determines the winner of this round'''
        if self.ai_play == self.user_play:
            print('This round was a draw.')
            return

# constructs a tuple from the ai play and the user play 
        play_pair = (self.ai_play, self.user_play)
        if play_pair in AI_WINS:
            print('The AI won this round!')
            self.ai_points += 1
        else:
            print('You won this round!')
            self.user_points += 1

def play(self):
        '''Plays a game of rock, paper, scissors'''
        # checks that the input is an integer
        while True:
            try:
                rounds = int(input('Input how many rounds of rock, paper, scissors you '
                                   'would like to play: \n'))
                break
            except ValueError:
                print('Please input an integer for the number of rounds you wish to play.')

# obtains the ai play and the user play and determines the winner for this round        
        for r in range(rounds):            
            self._ai_play()
            self._user_play()
            print('You chose %s and the AI chose %s.'%(CHOICES[self.user_play], CHOICES[self.ai_play]))
            self.determine_winner()

print('--------------------------------------------')
        # displays the score and prints the final winner for the game 
        print('You won %d round(s), and the AI won %d round(s).' %(self.user_points, self.ai_points))
        if self.ai_points == self.user_points:
            print('The game was a draw.')
        elif self.ai_points > self.user_points:
            print('The AI won the game!')
        else:
            print('You won the game!')
            
if __name__ == '__main__':
	game = RockPaperScissors()
	game.play()

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