class_docstr: Base ``History`` interface.
class_docstr_tok: ["Base","``","History","``","interface","."]
docstr: Iterate through all the items of the history. Cronologically. 
docstr_tok: ["Iterate","through","all","the","items","of","the","history",".","Cronologically","."]
code: def __iter__(self):
      "Iterate through all the items of the history. Cronologically."
  
imports: from __future__ import unicode_literals
  from abc import ABCMeta, abstractmethod
  from six import with_metaclass
  import datetime
  import os
label_desc: Use image node_id 3 for calling the History obj's underlying member method code with example usage: obj.__iter__() without return types