self.__setattr__

self.__setattr__ 是 Python 中的一个特殊方法，用于设置对象的属性值。它可以通过以下两种方式调用：

1. 直接调用：`self.__setattr__('attr_name', attr_value)`
2. 使用点号语法：`self.attr_name = attr_value`

这两种方式本质上是等价的，都会调用 `__setattr__` 方法来设置属性值。

相关问题

super().__setattr__

`super().__setattr__()` is a built-in Python function that can be used to call the `__setattr__()` method of the parent class in a subclass. It is commonly used when you want to add some additional functionality to the `__setattr__()` method of the parent class without completely overriding it.

Here's an example:

class MyClass:
    def __setattr__(self, name, value):
        print(f"Setting {name} to {value}")
        super().__setattr__(name, value)

class MySubclass(MyClass):
    def __setattr__(self, name, value):
        print(f"Adding extra functionality for {name} = {value}")
        super().__setattr__(name, value.upper())

In this example, `MySubclass` is a subclass of `MyClass`. It overrides the `__setattr__()` method of its parent class to add some extra functionality. However, it still wants to call the `__setattr__()` method of the parent class to handle the actual setting of the attribute.

To do this, it uses `super().__setattr__(name, value.upper())` to call the `__setattr__()` method of the parent class and pass in the modified value. This allows it to add its own functionality while still preserving the functionality of the parent class.

super().__setattr__是什么

`super().__setattr__` 是 Python 中的内置函数，用于在子类中对父类属性进行赋值操作。它可以调用父类的方法来设置属性，而不影响子类自身的属性。具体来说，它可以用于在子类中重载父类属性，或者在子类中增加新的属性。在调用 `super().__setattr__` 的时候，需要传入两个参数：第一个参数是子类的类名，第二个参数是属性名和属性值的键值对。例如：

class Parent:
    def __init__(self):
        self._x = None

    def get_x(self):
        return self._x

    def set_x(self, value):
        self._x = value

class Child(Parent):
    def __init__(self):
        super().__init__()
        self._y = None

    def get_y(self):
        return self._y

    def set_y(self, value):
        self._y = value

    def set_x(self, value):
        super().__setattr__('_x', value * 2)

在上面的代码中，`Child` 继承自 `Parent`，并在 `set_x` 方法中调用了 `super().__setattr__` 来设置 `_x` 属性的值。这样，当我们在子类中调用 `set_x` 方法时，实际上调用的是父类的 `set_x` 方法，并且将输入值乘以 2 后再进行赋值操作。