python - __init__ 作为构造函数？

Question

Dive into Python -

It would be tempting but incorrect to call this the constructor of the class. It's tempting, because it looks like a constructor (by convention, __init__ is the first method defined for the class), acts like one (it's the first piece of code executed in a newly created instance of the class), and even sounds like one (“init” certainly suggests a constructor-ish nature). Incorrect, because the object has already been constructed by the time __init__ is called, and you already have a valid reference to the new instance of the class.

引用建议将 __init__ 作为 构造函数 调用是不正确的，因为在调用 __init__ 时对象已经被构造。但!我一直认为 constructor 仅在构造对象后才被调用，因为它本质上是用于初始化实例的数据成员，如果对象不这样做就没有意义constructor 被调用时是否存在？ (来自 C++/Java 背景)

Answer 1

如果你有一个类 Foo 那么:

• Foo() 是 构造函数
• Foo.__init__() 是 初始化器
• Foo.__new__()是分配器

Python 对象的构造只是分配一个新实例，然后初始化该实例。