class_docstr: Base class for all Stores
class_docstr_tok: ["Base","class","for","all","Stores"]
code: def start(self, data=None, broker=None):
      if not self._started:
          self._started = True
          self.notifs = collections.deque()
          self.datas = list()
          self.broker = None
  
      if data is not None:
          self._cerebro = self._env = data._env
          self.datas.append(data)
  
          if self.broker is not None:
              if hasattr(self.broker, "data_started"):
                  self.broker.data_started(data)
  
      elif broker is not None:
          self.broker = broker
  
file_path: backtrader/backtrader/store.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import collections
  from backtrader.metabase import MetaParams
  from backtrader.utils.py3 import with_metaclass
label_desc: Use image node_id 3 for calling the Store obj's underlying member method code with example usage: obj.start(data, broker) without return types