<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def update(self, resource, timeout=-1):
 """ Updates a Logical Switch. Args: resource (dict):
 Object to update. timeout: Timeout in seconds. Wait for task completion by default. The timeout does not abort the operation in OneView, just stop waiting for its completion. Returns: dict: Updated resource. """

        self.__set_default_values(resource)
        uri = self._client.build_uri(resource['logicalSwitch']['uri'])
        return self._client.update(resource, uri=uri, timeout=timeout)