test_enumerate.py 文件源码

def test_bug1229429(self):
        # this bug was never in reversed, it was in
        # PyObject_CallMethod, and reversed_new calls that sometimes.
        if not hasattr(sys, "getrefcount"):
            return
        def f():
            pass
        r = f.__reversed__ = object()
        rc = sys.getrefcount(r)
        for i in range(10):
            try:
                reversed(f)
            except TypeError:
                pass
            else:
                self.fail("non-callable __reversed__ didn't raise!")
        self.assertEqual(rc, sys.getrefcount(r))