TitForTat.py

class TitForTat():
    ''' TitForTat will replicate its opponent's last move. '''
    def step(self, history, round):
        if round == 0:
            action = 1
        else:
            action = history[self.order^1][round - 1]
            # ^ is the bitwise XOR operator, for easy switching from 0 to 1.
        return action