Rock Paper Scissor - intro to python

rock_paper_scissor.py

"""The great game of Rock Paper Scissor"""

import os
import random


def play(rounds):
    """Play game() N times and present a scoreboard when complete"""
    user_score = 0
    comp_score = 0
    for _ in range(0, rounds):
        if game() is True:
            user_score += 1
        else:
            comp_score += 1

    # clear the screen
    os.system('cls' if os.name == 'nt' else 'clear')

    print('-----------')
    print('Scoreboard:')
    print('-----------')
    print('User: {}'.format(user_score))
    print('Computer: {}'.format(comp_score))
    print('')
    print('-----------')
    if user_score > comp_score:
        print('YOU WON!')
    else:
        print('YOU LOST!')


def game():
    """Single RPS round, returning user outcome boolean"""
    os.system('cls' if os.name == 'nt' else 'clear')
    print("Let's Play!")
    print('-----------')
    print('')
    print('1) Rock')
    print('2) Paper')
    print('3) Scissor')
    print('')
    user_selection = input('Make a selection (numbers and words accepted): ')

    valid_selection = {
        1: 'rock',
        2: 'paper',
        3: 'scissor',
    }

    try:
        key = int(user_selection)
        if key in valid_selection.keys():
            user_selection = valid_selection[key]
        else:
            return game()
    except ValueError:
        if user_selection.lower() in valid_selection.values():
            user_selection = user_selection.lower()
        else:
            return game()

    # get the computer's selection
    computer_selection = random.randint(1, 3)
    computer_selection = valid_selection[computer_selection]

    # Handle possible outcomes
    if user_selection == computer_selection:
        input('\nYOU TIED! TRY AGAIN ...')
        return game()

    elif (user_selection == 'rock' and computer_selection == 'paper') \
            or (user_selection == 'paper' and computer_selection == 'scissor') \
            or (user_selection == 'scissor' and computer_selection == 'rock'):
        input('\nYOU LOSE')
        return False

    else:
        input('\nYOU WIN')
        return True


def rock_paper_scissor():
    """Main entry point for the game"""
    os.system('cls' if os.name == 'nt' else 'clear')

    # present the menu
    print('Rock - Paper - Scissor')
    print('----------------------')
    print('')
    print('1) Quick Draw')
    print('2) Best out of 3')
    print('3) Exit')
    print('')
    selection = input('Make a selection: ')

    # Check for a integer input
    try:
        selection = int(selection)
    except ValueError:
        return rock_paper_scissor()

    # Check that it's a valid option
    valid_selection = [1, 2, 3]
    if selection not in valid_selection:
        return rock_paper_scissor()

    # at this point, selection is valid. operate on it
    if selection == 1:
        play(1)
    elif selection == 2:
        play(3)
    elif selection == 3:
        exit()


if __name__ == '__main__':
    rock_paper_scissor()