from axelrod._strategy_utils import detect_cycle
from axelrod.action import Action
from axelrod.player import Player
from .axelrod_first import FirstByJoss as Joss
C, D = Action.C, Action.D
[docs]class Calculator(Player):
"""
Plays like (Hard) Joss for the first 20 rounds. If periodic behavior is
detected, defect forever. Otherwise play TFT.
Names:
- Calculator: [Prison1998]_
"""
name = "Calculator"
classifier = {
"memory_depth": float("inf"),
"stochastic": True,
"makes_use_of": set(),
"long_run_time": False,
"inspects_source": False,
"manipulates_source": False,
"manipulates_state": False,
}
def __init__(self) -> None:
super().__init__()
self.joss_instance = Joss()
[docs] def strategy(self, opponent: Player) -> Action:
turn = len(self.history)
if turn > 0:
self.joss_instance.history.append(self.history[-1],
opponent.history[-1])
if turn == 20:
self.cycle = detect_cycle(opponent.history)
return self.extended_strategy(opponent)
if turn > 20:
return self.extended_strategy(opponent)
else:
play = self.joss_instance.strategy(opponent)
return play
def extended_strategy(self, opponent: Player) -> Action:
if self.cycle:
return D
else:
# TFT
return D if opponent.history[-1:] == [D] else C