test_descr.py 文件源码

def test_newslots(self):
        # Testing __new__ slot override...
        class C(list):
            def __new__(cls):
                self = list.__new__(cls)
                self.foo = 1
                return self
            def __init__(self):
                self.foo = self.foo + 2
        a = C()
        self.assertEqual(a.foo, 3)
        self.assertEqual(a.__class__, C)
        class D(C):
            pass
        b = D()
        self.assertEqual(b.foo, 3)
        self.assertEqual(b.__class__, D)