Girls Who Code RPS Technical Project

#Jannitta Yao
#Girls Who Code Application

import random

def isValidGesture(gesture):
    """Returns True if gesture is one of the strings 'rock', 'paper', or
       'scissors', and False otherwise."""
    return gesture == 'rock' or gesture == 'paper' or gesture =='scissors'

def randomGesture():
    """Randomly returns one of 'rock', 'paper', or 'scissors',
       with equal probability."""
    
    outcome = random.randint(1,3)
    if outcome == 1: 
        return 'rock'
    elif outcome == 2:
        return 'paper'
    elif outcome == 3: 
        return 'scissors'

def beats(gesture1, gesture2):
    """Returns True if the first gesture beats the second gesture, i.e.,
       if the first and second gesture are rock/scissors or scissors/paper,
       or paper/rock, respectively. Returns False otherwise.
       The output is unspecified if one or both gestures is invalid."""
    
    win1 = gesture1 == 'rock' and gesture2 == 'scissors'
    win2 = gesture1 == 'scissors' and gesture2 == 'paper'
    win3 = gesture1 == 'paper' and gesture2 == 'rock'
    
    return win1 or win2 or win3

def play(you, opponent):
    """Plays rock/paper/scissors game with your gesture vs. opponent's
       gesture. If both gestures are valid, displays one of 'Game is
       a tie!', 'You win!', or 'Opponent wins!'. Otherwise, indicates
       the first gesture that is invalid."""
    valid = isValidGesture(you) and isValidGesture(opponent) == True 
    error1 = isValidGesture(you) == False 
    error2 = isValidGesture(opponent) == False
    youWin = beats(you,opponent) == True
    other = beats(you, opponent) == False
    
    if valid and youWin:
        print 'You win!'
        
    elif valid and other and you != opponent: 
        print 'Opponent wins!'
       
    elif valid and other and you == opponent: 
        print 'Game is a tie!' 
    
    if not valid and error1: 
        print "Your gesture ({}) is invalid".format(you) 
        
    elif not valid and error2: 
        print "Opponent's gesture ({}) is invalid".format(opponent)

def playComputer(you):
    """Plays rock/paper/scissors with your gesture against a computer
       opponent that randomly chooses a gesture. First displays the choice
       of the computer, and then displays the result of the game."""
       
    computer = randomGesture()
    print 'Computer chooses', computer
    play(you, computer)
    
#if __name__ == "__main__":
	"""Uncomment lines below to run the play and playComputer functions."""
    
	# play('rock', 'scissors')
    # play('rock', 'paper')
    # play('paper', 'paper')

# playComputer('rock')
    # playComputer('scissors')
    # playComputer('paper')
    # playComputer('Leia')

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