test_weakset.py 文件源码

def test_intersection(self):
        i = self.s.intersection(self.items2)
        for c in self.letters:
            self.assertEqual(c in i, c in self.d and c in self.items2)
        self.assertEqual(self.s, WeakSet(self.items))
        self.assertEqual(type(i), WeakSet)
        for C in set, frozenset, dict.fromkeys, list, tuple:
            x = WeakSet([])
            self.assertEqual(self.s.intersection(C(self.items2)), x)