old_contents: class DatasetExample(object):
  
      """Sample dataset to demonstrate a simple extension with Cihai.
  
      This object is passed into :meth:`cihai.Cihai.use` in the
      :class:`cihai.Cihai` object.
  
      """
  
      def get(self, request, response):
          """Return chinese character data from sample dataset.
  
          The source of information in this example is a :obj:`dict`. In real
          modules, the dataset may be a CSV, sqlite database, or an API. As long
          as the data appends to the :param:`response` and returns it.
  
          :param request: The character or string being looked up, e.g. '好'.
          :type request: str
          :returns: Cihai response dictionary
          :rtype: dict
  
          """
          dataset = {"好": {"definition": "hao"}}
  
          if request in dataset:
              response.update(dataset[request])
  
          return response
  
      def reverse(self, request, response):
          """Return chinese character data from a reverse lookup sample dataset.
  
          :param request: The character or string being looked up, e.g. '好'.
          :type request: str
          :returns: Cihai reverse look up. The results should be formatted as::
  
              {
                  '好': {
                      'definition': 'good.'
                  }
              }
  
          When the character already exists in :param:`response`, the character
          ``好`` must be mixed-in with, not overwritten.
  
          :rtype: dict
  
          """
          dataset = {"好": {"definition": "hao"}}
  
          for char, key in dataset.items():
              for key, val in dataset[char].items():
                  if request in val:
                      response.update({char: dataset[char]})
  
          return response
  
new_contents: class DatasetExample(object):
  
      """Sample dataset to demonstrate a simple extension with Cihai.
  
      This object is passed into :meth:`cihai.Cihai.use` in the
      :class:`cihai.Cihai` object.
  
      """
  
      def get(self, request, response):
          """Return chinese character data from sample dataset.
  
          The source of information in this example is a :obj:`dict`. In real
          modules, the dataset may be a CSV, sqlite database, or an API. As long
          as the data appends to the :param:`response` and returns it.
  
          :param request: The character or string being looked up, e.g. '好'.
          :type request: str
          :returns: Cihai response dictionary
          :rtype: dict
  
          """
          dataset = {"好": {"definition": "hao"}}
  
          if request in dataset:
              response.update(dataset[request])
  
          return response
  
      def reverse(self, request, response):
          """Return chinese character data from a reverse lookup sample dataset.
  
          :param request: The character or string being looked up, e.g. '好'.
          :type request: str
          :returns: Cihai reverse look up. The results should be formatted as::
  
              {
                  '好': {
                      'definition': 'good.'
                  }
              }
  
          When the character already exists in :param:`response`, the character
          ``好`` must be mixed-in with, not overwritten.
  
          :rtype: dict
  
          """
          dataset = {"好": {"definition": "hao"}}
  
          for char in dataset.keys():
              for val in dataset[char].values():
                  if request in val:
                      response.update({char: dataset[char]})
  
          return response
  
subject: Remove unused loop variable