test_csv.py 文件源码

def test_write(self):
        delta = 0
        rows = [[1,2,3]]*5
        s = NUL()
        lastrc = sys.gettotalrefcount()
        for i in range(20):
            gc.collect()
            self.assertEqual(gc.garbage, [])
            rc = sys.gettotalrefcount()
            writer = csv.writer(s)
            for row in rows:
                writer.writerow(row)
            delta = rc-lastrc
            lastrc = rc
        # if writer leaks during write, last delta should be 5 or more
        self.assertEqual(delta < 5, True)