def _retrieve_cached_source_variable(self, source_id, name):
        """
        Retrieves the cache state of the named variable for a particular
        source. If the variable has not been cached then the UncachedVariable
        exception is raised.
        """
        try:
            s = self._source_state[source_id][name.lower()]
            logger.debug("Source Cache retrieve S[%d].%s = %s",
                         source_id, name, s)
            return s
        except KeyError:
            raise UncachedVariable
def _retrieve_cached_source_variable ( self , source_id , name ) : try : s = self . _source_state [ source_id ] [ name . lower ( ) ] logger . debug ( "Source Cache retrieve S[%d].%s = %s" , source_id , name , s ) return s except KeyError : raise UncachedVariable
Retrieves the cache state of the named variable for a particular
        source. If the variable has not been cached then the UncachedVariable
        exception is raised.