new_contents: class Docstring:
      """Class for storing docstring information.
  
      Following headers are used by this class:
  
      * 'summary' - first line of the docstring
      * 'extended' - blocks of extended description concerning the functionality of the code
      * 'parameters' - parameters of a method
      * 'other parameters' - parameters that are not commonly used
      * 'returns' - returned value of a method
      * 'yields' - generated value of a generator
      * 'raises' - errors raised
      * 'see also' - other related code
      * 'notes' - blocks of other information about the code (e.g. implementation details)
      * 'references' - references used
      * 'examples' - examples of code usage
      * 'attributes' - attributes of a class
      * 'methods' - methods of a class/module
  
      Attributes
      ----------
      info : dict
          Dictionary of the headers to contents under header.
  
      Methods
      -------
      __init__(**headers_contents)
          Initialize.
      parse_google(docstring)
          Return instance of Docstring that corresponds to given google docstring.
      parse_numpy(docstring)
          Return instance of Docstring that corresponds to given numpy docstring.
      parse_instance(instance)
          Return instance of Docstring that corresponds to provided instance.
      make_google()
          Return corresponding google docstring
      make_numpy()
          Return corresponding numpy docstring
  
      Example
      -------
      For example, this docstring should be equivalent to
  
      info = {'Attributes': {'info': {'type': ['dict'],
                             'docs':['Dictionary of the headers to contents under header.']}}}
      info = {'Attributes': {'info': <ParamDocstring object>}}
      """
      pass
  
  
  class ParamDocstring:
      """Class for storing docstring information on parameters.
  
      Attributes
      ----------
      name : str
          Name of the parameter.
      types : list of str
          Type of the parameters allowed.
      docs : list of str
          Documentations for the parameter.
  
      Methods
      -------
      __init__(name, type=None, docs=None)
          Initialize.
      parse_google(docstring)
          Return instance of Docstring that corresponds to given google docstring.
      parse_numpy(docstring)
          Return instance of Docstring that corresponds to given numpy docstring.
      """
      pass
  
  
  class MethodDocstring:
      """Class for storing docstring information on methods.
  
      Attributes
      ----------
      name : str
          Name of the method.
      call_signature : str
          Call signature of the method.
      docs : list of str
          Documentations for the method.
  
      Methods
      -------
      __init__(name, call_signature, docs=None)
          Initialize.
      parse_google(docstring)
          Return instance of Docstring that corresponds to given google docstring.
      parse_numpy(docstring)
          Return instance of Docstring that corresponds to given numpy docstring.
      """
      pass
  
subject: Add general framework for coding