Source code for pettingzoo.utils.agent_selector
from __future__ import annotations
from typing import Any
from warnings import warn
[docs]
class AgentSelector:
"""Outputs an agent in the given order whenever agent_select is called.
Can reinitialize to a new order.
Example:
>>> from pettingzoo.utils import AgentSelector
>>> agent_selector = AgentSelector(agent_order=["player1", "player2"])
>>> agent_selector.reset()
'player1'
>>> agent_selector.next()
'player2'
>>> agent_selector.is_last()
True
>>> agent_selector.reinit(agent_order=["player2", "player1"])
>>> agent_selector.next()
'player2'
>>> agent_selector.is_last()
False
"""
def __init__(self, agent_order: list[Any]):
self.reinit(agent_order)
[docs]
def reinit(self, agent_order: list[Any]) -> None:
"""Reinitialize to a new order."""
self.agent_order = agent_order
self._current_agent = 0
self.selected_agent = 0
[docs]
def reset(self) -> Any:
"""Reset to the original order."""
self.reinit(self.agent_order)
return self.next()
[docs]
def next(self) -> Any:
"""Get the next agent."""
self._current_agent = (self._current_agent + 1) % len(self.agent_order)
self.selected_agent = self.agent_order[self._current_agent - 1]
return self.selected_agent
[docs]
def is_last(self) -> bool:
"""Check if the current agent is the last agent in the cycle."""
return self.selected_agent == self.agent_order[-1]
[docs]
def is_first(self) -> bool:
"""Check if the current agent is the first agent in the cycle."""
return self.selected_agent == self.agent_order[0]
def __eq__(self, other: AgentSelector) -> bool:
if not isinstance(other, AgentSelector):
return NotImplemented
return (
self.agent_order == other.agent_order
and self._current_agent == other._current_agent
and self.selected_agent == other.selected_agent
)
[docs]
class agent_selector(AgentSelector):
"""Deprecated version of AgentSelector. Use that instead."""
def __init__(self, *args, **kwargs):
warn(
"agent_selector is deprecated, please use AgentSelector",
DeprecationWarning,
)
super().__init__(*args, **kwargs)