code: def __enforce_only_strings_dict(dictionary):
      '''
      Returns a dictionary that has string keys and values.
      '''
      ret = {}
  
      for key, value in iteritems(dictionary):
          ret[six.text_type(key)] = six.text_type(value)
  
      return ref __enforce_only_strings_dict(dictionary):
      '''
      Returns a dictionary that has string keys and values.
      '''
      ret = {}
  
      for key, value in iteritems(dictionary):
          ret[six.text_type(key)] = six.text_type(value)
  
      return ret
docs: Returns a dictionary that has string keys and values.