def outerjoin(left, right, onclause=None, join_to_left=None):
 return _ORMJoin(left, right, onclause, True)

def outerjoin ( left , right , onclause = None , join_to_left = None ) : return _ORMJoin ( left , right , onclause , True )
produce a left outer join between left and right clauses .