Source code for axelrod.strategies.defector

from axelrod.action import Action
from axelrod.player import Player

C, D = Action.C, Action.D

[docs]class Defector(Player): """A player who only ever defects. Names: - Defector: [Axelrod1984]_ - ALLD: [Press2012]_ - Always defect: [Mittal2009]_ """ name = "Defector" classifier = { "memory_depth": 0, "stochastic": False, "makes_use_of": set(), "long_run_time": False, "inspects_source": False, "manipulates_source": False, "manipulates_state": False, }
[docs] @staticmethod def strategy(opponent: Player) -> Action: return D
[docs]class TrickyDefector(Player): """A defector that is trying to be tricky. Names: - Tricky Defector: Original name by Karol Langner """ name = "Tricky Defector" classifier = { "memory_depth": float("inf"), # Long memory "stochastic": False, "makes_use_of": set(), "long_run_time": False, "inspects_source": False, "manipulates_source": False, "manipulates_state": False, }
[docs] def strategy(self, opponent: Player) -> Action: """Almost always defects, but will try to trick the opponent into cooperating. Defect if opponent has cooperated at least once in the past and has defected for the last 3 turns in a row. """ if opponent.history.cooperations > 0 and opponent.history[-3:] == [D] * 3: return C return D