<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def retrieve_differences(self, id_or_uri, content, timeout=-1):
 """ Retrieves the modified contents of the selected Plan Script according to the provided content object, as per the selected attributes. Args: id_or_uri: ID or URI of the Plan Script. content (str):
 Plan Script content. timeout: Timeout in seconds. Waits for task completion by default. The timeout does not abort the operation in OneView, it just stops waiting for its completion. Returns: dict: Script differences. """

        uri = self.URI + "/differences/" + extract_id_from_uri(id_or_uri)
        return self._client.create(content, uri=uri, timeout=timeout)