code: def handler(self, operation=None, **kwargs):
          
          response = self._new_response()
          if operation is None:
              response.status = 'error'
              response.error_type = 'MissingOperation'
              response.error_message = 'You must pass an operation'
              return response
          operation = operation.lower()
          self._check_supported_op(operation, response)
          if response.status == 'success':
              method = getattr(self, operation, None)
              if callable(method):
                  response = method(**kwargs)
              else:
                  response.status == 'error'
                  response.error_type = 'NotImplemented'
                  msg = 'Operation: {} is not implemented'.format(operation)
                  response.error_message = msg
          return response
docs: In addition to the methods described above, cruddy also provides a
          generic handler interface.  This is mainly useful when you want to wrap
          a cruddy handler in a Lambda function and then call that Lambda
          function to access the CRUD capabilities.
  
          To call the handler, you simply put all necessary parameters into a
          Python dictionary and then call the handler with that dict.
  
          ```
          params = {
              'operation': 'create',
              'item': {'foo': 'bar', 'fie': 'baz'}
          }
          response = crud.handler(**params)
          ```