import unittest

class A:
    @classmethod
    def f(kls):
        pass

class TestIsOperator(unittest.TestCase):
    CLASSMETHODS = ['dict.fromkeys', 'A.f']

    def test_classmethod1(self):
        for cm in self.CLASSMETHODS:
            # consecutive calls to id(dict.fromkeys) returning different
            # values?
            expected = id(eval(cm))
            x = eval(cm) # binding it to something changes the id
            for i in range(0,10):
                self.assertEqual(expected, id(eval(cm)))

    def test_classmethod2(self):
        for cm in self.CLASSMETHODS:
            self.assertIs(eval(cm), eval(cm))
            x = eval(cm)
            self.assertIs(x, eval(cm))
            self.assertIs(x, x)
            y = eval(cm)
            self.assertIs(x, y)

if __name__ == '__main__':
    unittest.main()