tt.py

class Proxy:
    def __init__(self, obj):
        self._obj = obj

    def __getattr__(self, item):
        #这里的毛病
        return getattr(self._obj, item)


class Spam:
    def __init__(self, x):
        self.x = x

    def bar(self, y):
        print('Spam.bar:', self.x, y)


if __name__ == "__main__":
    spam = Spam(10.05)
    proxy = Proxy(spam)
    print(proxy.x)