class_docstr: Base strategy for trading
class_docstr_tok: ["Base","strategy","for","trading"]
code: def trade_position(self) -> BasePosition:
      return self.common_infra.get("trade_account").current_position
  
imports: from __future__ import annotations
  from abc import ABCMeta, abstractmethod
  from typing import Any, Generator, Optional, TYPE_CHECKING, Union
  from typing import Tuple
  from ..backtest.decision import BaseTradeDecision
  from ..backtest.utils import CommonInfrastructure, LevelInfrastructure, TradeCalendarManager
  from ..rl.interpreter import ActionInterpreter, StateInterpreter
  from ..utils import init_instance_by_config
label_desc: Use image node_id 4 for calling the BaseStrategy obj's underlying member method code with example usage: obj.trade_position() and returns: self