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,
"long_run_time": False,
"inspects_source": False,
"manipulates_source": False,
"manipulates_state": False,
}
[docs]
@staticmethod
def strategy(opponent: Player) -> Action:
"""Actual strategy definition that determines player's 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,
"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