utils.py 文件源码

def test_cached_property(self):
        foo = []
        class A(object):
            def prop(self):
                foo.append(42)
                return 42
            prop = utils.cached_property(prop)

        a = A()
        p = a.prop
        q = a.prop
        self.assert_true(p == q == 42)
        self.assert_equal(foo, [42])

        foo = []
        class A(object):
            def _prop(self):
                foo.append(42)
                return 42
            prop = utils.cached_property(_prop, name='prop')
            del _prop

        a = A()
        p = a.prop
        q = a.prop
        self.assert_true(p == q == 42)
        self.assert_equal(foo, [42])