code: def update(self, new_email_address, name, custom_fields, resubscribe, consent_to_track, restart_subscription_based_autoresponders=False):
          
          validate_consent_to_track(consent_to_track)
          params = {"email": self.email_address}
          body = {
              "EmailAddress": new_email_address,
              "Name": name,
              "CustomFields": custom_fields,
              "Resubscribe": resubscribe,
              "ConsentToTrack": consent_to_track,
              "RestartSubscriptionBasedAutoresponders": restart_subscription_based_autoresponders}
          response = self._put("/subscribers/%s.json" % self.list_id,
                               body=json.dumps(body), params=params)
          # Update self.email_address, so this object can continue to be used
          # reliably
          self.email_address = new_email_address
docs: Updates any aspect of a subscriber, including email address, name, and
          custom field data if supplied.