human
Solve the following python programming problem given the following code:
def _dialect(self) : 
    canary = [] 
    class PoolDialect (object) : 
        def do_rollback(self, dbapi_connection) : 
            canary.append ('R') 
            dbapi_connection.rollback () 
def do_commit(self, dbapi_connection) : 
            canary.append ('C') 
            dbapi_connection.commit () 
def do_close(self, dbapi_connection) : 
            canary.append ('CL') 
            dbapi_connection.close () 
return (PoolDialect (), self) 

    
    

    Fix the buggy line: return (PoolDialect (), self)
assistant
#Here is Python code to fix the buggy line: return (PoolDialect (), self)
.

return (PoolDialect (), canary)