Example 3

class Blog:
    def read(self):
        print("Read the blog")

    def write(self):
        print("Write the blog")


class Proxy:
    def __init__(self, target):
        self.target = target

    def __getattr__(self, attr):
        return getattr(self.target, attr)


class AnonUserBlogProxy(Proxy):
    def __init__(self, blog):
        super().__init__(blog)

    def write(self):
        print("Only authorized users can write blog posts.")

from proxy2 import Blog, AnonUserBlogProxy

blog = Blog()
blog.write()  # can write the blog

proxy = AnonUserBlogProxy(blog)
proxy.write()  # only authorized users can write the blog