Endpoint: /photo/<id>/update.json

        Updates a photo with the specified parameters.
        Returns the updated photo object.

def update(self, photo, **kwds):
        """
        Endpoint: /photo/<id>/update.json

        Updates a photo with the specified parameters.
        Returns the updated photo object.
        """
        result = self._client.post("/photo/%s/update.json" %
                                   self._extract_id(photo),
                                   **kwds)["result"]
        return Photo(self._client, result)