human
Solve the following python programming problem given the following code:
def _testPool_9(self, res) : 
    sql = 'select count(1) from simple' 
    d = self.dbpool.runQuery (d) 
    def _check(row) : 
        self.assertTrue ((int (row [0] [0]) == 0), "Didn't successfully delete table contents") 
        self.checkConnect () 
d.addCallback (_check) 
    return d 

    
    

    Fix the buggy line: d = self.dbpool.runQuery (d)
assistant
#Here is Python code to fix the buggy line: d = self.

d = self.dbpool.runQuery (sql)