docs: def set(self, person, properties=None, timestamp=None,
              path=KISSmetrics.SET_PATH):
          """Set a property (or properties) for a `person`.
  
          :param person: individual to associate properties with
          :param properties: key-value pairs to associate with `person`
          :type properties: dict
          :param timestamp: when the `event` was performed; optional for
                            back-dating
          :param path: HTTP endpoint to use; defaults to
                      ``KISSmetrics.SET_PATH``
  
          :returns: an HTTP response for the request
          :rtype: `urllib3.response.HTTPResponse`
  
          """
          this_request = request.set(self.key, person, timestamp=timestamp,
                                     properties=properties,
                                     scheme=self.trk_scheme, host=self.trk_host,
                                     path=path)
          return self._request(this_request)