test_pickle.py 文件源码

def test_pickler(self):
            basesize = support.calcobjsize('5P2n3i2n3iP')
            p = _pickle.Pickler(io.BytesIO())
            self.assertEqual(object.__sizeof__(p), basesize)
            MT_size = struct.calcsize('3nP0n')
            ME_size = struct.calcsize('Pn0P')
            check = self.check_sizeof
            check(p, basesize +
                MT_size + 8 * ME_size +  # Minimal memo table size.
                sys.getsizeof(b'x'*4096))  # Minimal write buffer size.
            for i in range(6):
                p.dump(chr(i))
            check(p, basesize +
                MT_size + 32 * ME_size +  # Size of memo table required to
                                          # save references to 6 objects.
                0)  # Write buffer is cleared after every dump().