class_docstr: The account object tracks information about the trading account. The
  values are updated as the algorithm runs and its keys remain unchanged.
  If connected to a broker, one can update these values with the trading
  account values as reported by the broker.
code: def __repr__(self):
      return "Account({0})".format(self.__dict__)
  
imports: from warnings import warn
  import pandas
  from catalyst.assets import Asset, Future
  from catalyst.utils.input_validation import expect_types
  from .utils.enum import enum
  from catalyst._protocol import BarData
label_desc: Use image node_id 2 for calling the Account obj's underlying member method code with example usage: obj.__repr__() and returns: str