Python“\uuuuu setattr\uuuuuuuuuuu”和“\uuuuuuu getattribute\uuuuuuuuuuuuuuuuuuuuuuuuu”混淆

class Spam(object):

    def __init__(self, a, b):
        self.a = a
        self.b = b

    # using this to mark field "c" as deprecated. As per my understanding this gets called only for fields that do not exist.
    def __getattr__(self, c):
        print("Deprecated")

    # using this to manipulate the value before storing
    def __setattr__(self, name, value):
        self.__dict__[name] = value + 1

    # interceptor to allows me to define rules for whenever an attribute's value is accessed
    def __getattribute__(self, name):
        return self.__dict__[name] 

spam = Spam(10, 20)

print(spam.a)
print(spam.b)
print(spam.c)

但是上面的代码没有打印任何内容。这里出了什么问题,有人能帮我理解吗?我在书中读到了这些方法 https://rszalski.github.io/magicmethods/#access