RPS (Girls Who Code Application)

"""Tracy Goldman, Girls Who Code 2018 Summer Immersion Program Teaching Assistant Application"""
import random

class RPS(object):
    """An instance is an RPS object, representing one of rock, paper, or scissors.
    Attributes:
    name [string]: the name that defines it ("ROCK", "PAPER", or "SCISSORS").
    beats [string]: the name of the object that it defeats, following normal RPS rules.
    loses [string]: the name of the object that it loses to, following normal RPS rules.
    """
    """Initializes an RPS object."""
    def __init__(self,name):
        assert name == "ROCK" or name == "PAPER" or name == "SCISSORS"
        self.name = name
        if name == "ROCK":
            self.beats = "SCISSORS"
            self.loses = "PAPER"
        elif name == "SCISSORS":
            self.beats = "PAPER"
            self.loses = "ROCK"
        elif name == "PAPER":
            self.beats = "ROCK"
            self.loses = "SCISSORS"

"""Runs the RPS game. The player is prompted to select rock, paper, or scissors."""
def selection():
	valid = False
	pscore = 0
	oscore = 0
	while not valid:
		choice = input("Rock, Paper, or Scissors? ")
		type(choice)
		newchoice = choice.upper()
		if newchoice == "ROCK" or newchoice == "PAPER" or newchoice == "SCISSORS":
			print("You chose " + newchoice)
			valid = True
			opchoice = opponentChoice()
			print("Opponent chose " + opchoice)
			comp = comparator(newchoice,opchoice)
			if comp == -1:
				print("You lose.")
				oscore += 1
			elif comp == 0:
				print("Tie.")
			elif comp == 1:
				print("You win!")
				pscore += 1
			print("Your score: " + str(pscore))
			print("Opponent's score: " + str(oscore))
			playagain = input("Play again? ")
			playagain = playagain.upper()
			if playagain == "YES" or playagain == "Y":
				valid = False
			else:
				if pscore > oscore:
					print("You win!")
				elif pscore < oscore:
					print("You lose.")
		else:
			print("Invalid choice.")
			
			
"""Selects rock, paper, or scissors for the opponent."""
def opponentChoice():
	options = ["ROCK","PAPER","SCISSORS"]
	opchoice = random.randrange(0,3)
	return options[opchoice]

"""Compares the selections for the player and the opponent, and determines
which object wins."""
def comparator(choice1, choice2):
	playerchoice = RPS(choice1)
	opchoice = RPS(choice2)
	if playerchoice.name == opchoice.name:
		return 0
	elif playerchoice.beats == opchoice.name:
		return 1
	elif playerchoice.loses == opchoice.name:
		return -1

if __name__ == '__main__':
	selection()

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