docstr: Class has already been created ... register
docstr_tok: ["Class","has","already","been","created","...","register"]
code: def __init__(cls, name, bases, dct):
      """Class has already been created ... register"""
      # Initialize the class
      super(MetaIBBroker, cls).__init__(name, bases, dct)
      ibstore.IBStore.BrokerCls = cls
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import collections
  from copy import copy
  from datetime import date, datetime, timedelta
  import threading
  import uuid
  import ib.ext.Order
  import ib.opt
  from backtrader.feed import DataBase
  from backtrader import TimeFrame, num2date, date2num, BrokerBase, Order, OrderBase, OrderData
  from backtrader.utils.py3 import bytes, bstr, with_metaclass, queue, MAXFLOAT
  from backtrader.metabase import MetaParams
  from backtrader.comminfo import CommInfoBase
  from backtrader.position import Position
  from backtrader.stores import ibstore
  from backtrader.utils import AutoDict, AutoOrderedDict
  from backtrader.comminfo import CommInfoBase
label_desc: Use image node_id 1 to create a new MetaIBBroker object from inherited base classes: BrokerBase with example: obj = MetaIBBroker(cls, name, bases, dct)