Rock, paper, scissors created by walkermatt - https://repl.it/EsHd/15

Rock, paper, scissors.py

# Rock, paper, scissors

def beats(thing1, thing2):
  """ Determine who wins rock, paper, scissors
  by passing each players choice """
  if thing1 == thing2:
    # Draw, both players chose the same thing
    return None
  # Determine which thing beats thing2
  victors = {
    "rock": "scissors",
    "paper": "rock",
    "scissors": "paper"
  }
  victor = victors[thing2]
  return victor == thing1

# Tests

assert beats("rock", "paper") == True
assert beats("rock", "rock") == None
assert beats("scissors", "paper") == False
print "All assets pass!"