code: def __init__(self, *args, **kwargs):
      super(TestStrategyMixin, self).__init__(*args, **kwargs)
      self.posExecutionInfo = []
      self.ordersUpdated = []
      self.orderExecutionInfo = []
      self.begin = datetime.datetime.now()
      self.deadline = None
      self._scheduled = {}
      self.setStopAfter(5)
  
imports: import datetime
  from pyalgotrade import strategy
label_desc: Use image node_id 1 to create a new TestStrategyMixin object from inherited base classes: object with example: obj = TestStrategyMixin()