Rock, paper, scissors in Python.

beats = {"rock": "scissors", "scissors": "paper", "paper": "rock"}

def winner(a, b):
    if a == b:
        return "draw"
    if beats[a] == b:
        return "player 1"
    return "player 2"

rounds = [("rock", "paper"), ("paper", "paper"), ("scissors", "paper"), ("rock", "scissors")]
score = {"player 1": 0, "player 2": 0, "draw": 0}
for a, b in rounds:
    result = winner(a, b)
    score[result] = score[result] + 1
    print(a, "vs", b, "->", result)
print(score)

rock vs paper -> player 2
paper vs paper -> draw
scissors vs paper -> player 1
rock vs scissors -> player 1
{'player 1': 2, 'player 2': 1, 'draw': 1}