class_docstr: :class:`.History` class that keeps a list of all strings in memory.
class_docstr_tok: [":","class",":","`",".History","`","class","that","keeps","a","list","of","all","strings","in","memory","."]
code: def append(self, string):
      self.strings.append(string)
  
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 2 for calling the InMemoryHistory obj's underlying member method code with example usage: obj.append(string) without return types