(self, item)
return item in self._ids
Checks whether `item` already has an ID or not.
Checks whether `item` already has an ID or not.
Checks whether item already has an ID or not .
def __contains__(self, item):
        """Checks whether `item` already has an ID or not."""
        return item in self._ids
def __contains__ ( self , item ) : return item in self . _ids