Python：具有只读属性的协议元类

Question

我想实现一个具有只读属性并减少样板文件的协议。 简而言之：

# I want to reduce boilerplate of the following.
class MyVerboseProtocol(Protocol)
    @property
    def x(self):
        return x


# I want this to be functionally equivalent to MyVerboseProtocol
class MyProtocol(Protocol)
     x # this should be read-only


class MyClass(MyProtocol)
    x = 5


my_class = MyClass()
print(my_class.x) # should print 5
myclass.x = 4 # should raise some exception

我尝试了一个元类，但是带有协议的东西使该属性不是只读的：

class MyMetaProtocol(type(Protocol) # needs type(Protocol) or something won't resolve
    @property
    def x(self): # pylance seems to want self here
        return self.x


class MyProtocol(Protocol, metaclass=MyMetaProtocol)
    x


class MyClass(MyProtocol)
    x = 5


my_class = MyClass()
print(my_class.x) # should print 5
myclass.x = 4 # seems fine??

Answer 1

我要去 go，“越简单越好”。 违反协议背后的直觉可能不值得节省几次按键。

另一个选项是 class 装饰器，但如果我们有能力首先修改 class，那么它似乎没有多大意义。