from random import choice


side_names = ('heads', 'tails')

guess = input('Enter your guess (heads/tails): ').lower()
flip_result = choice(side_names)

print('Yes!' if flip_result == guess else 'No...', 'It was', flip_result)

'''
Tips for improvement:

1) Add the while cycle and handle the 'exit' option
2) Enable player to enter just the initial letter(s) of his/her choice
3) Show the player/computer score

'''