class_docstr: A group of :class:`Bar` objects.
  
  :param barDict: A map of instrument to :class:`Bar` objects.
  :type barDict: map.
  
  .. note::
      All bars must have the same datetime.
class_docstr_tok: ["A","group","of",":","class",":","`","Bar","`","objects",".",":","param","barDict",":","A","map","of","instrument","to",":","class",":","`","Bar","`","objects",".",":","type","barDict",":","map",".","..","note",":",":","All","bars","must","have","the","same","datetime","."]
code: def keys(self):
      return list(self.__barDict.keys())
  
imports: import abc
  import six
label_desc: Use image node_id 5 for calling the Bars obj's underlying member method code with example usage: obj.keys() and returns: list