Really basic rock, paper, scissors CLI game.

RockPaperScissors.py

from __future__ import annotations
from typing import AnyStr, Callable, Container, Tuple, Union


class Choice:
    def __init__(self, name: AnyStr, beats: Choice = None):
        self._name = name
        self._beats = beats

    @property
    def name(self):
        return self._name

    def beats(self, choice: Choice) -> Choice:
        """ Set the choice that this beats and then return the choice it beats so that we can easily set what it
        beats."""
        self._beats = choice
        return choice

    def wins(self, choice: Choice) -> bool:
        """ Check if we have a choice that we can beat and whether that choice is the same choice that we're
        testing. """
        return self._beats and self._beats.name == choice.name


def get_input(message: AnyStr, valid_options: Container, converter: Callable = str):
    """ Asks the user for input until they give an answer that is valid. """
    user_input = None
    while user_input not in valid_options:
        try:
            user_input = converter(input(f"{message} "))
        except ValueError:
            pass
    return user_input


class Game:
    def __init__(self):
        self._choices = {}

    def add_choice(self, name: AnyStr, beats: Union[AnyStr, None] = None) -> Game:
        """ Creates the choice if it doesn't exist, modifies it if it already exists.
        Both parameters are case insensitive strings.
        """
        self._choices[name.lower()] = self.get_choice(name) if self.get_choice(name) else Choice(name)
        self.get_choice(name).beats(self.get_choice(beats))
        return self

    def get_choice(self, name: AnyStr) -> Union[Choice, None]:
        """ Safely get's a choice, returning None if it doesn't exist. """
        return self._choices.get(name.lower() if name else None)

    def play(self):
        print("Let's Play!!")
        options = tuple(self._choices.keys())
        player1_input = self.get_choice(get_input(f"Player 1 choose an option ({', '.join(options)})", options, str.lower))
        player2_input = self.get_choice(get_input(f"Player 2 choose an option ({', '.join(options)})", options, str.lower))
        if player1_input.wins(player2_input):
            print("Player 1 Wins!!!")
        elif player2_input.wins(player1_input):
            print("Player 2 Wins!!!")
        else:
            print("It was a tie")


if __name__ == "__main__":
    game = Game()
    game.add_choice("Rock").add_choice("Paper", "Rock").add_choice("Scissors", "Paper").add_choice("Rock", "Scissors")
    keep_playing = True
    while keep_playing:
        game.play()
        keep_playing = get_input("Would you like to play again? y or n?", (True, False), lambda val: val.lower() == "y")
    else:
        print("Thanks for playing!!!")