__init __()是否应该调用父类的__init __()? [英] Should __init__() call the parent class's __init__()?

问题描述

我在Objective-C中使用了这种结构:

I'm used that in Objective-C I've got this construct:

- (void)init {
    if (self = [super init]) {
        // init class
    }
    return self;
}

Python还应该为__init__调用父类的实现吗?

Should Python also call the parent class's implementation for __init__?

class NewClass(SomeOtherClass):
    def __init__(self):
        SomeOtherClass.__init__(self)
        # init class

对于__new__()和__del__()这也是对还是错?

Is this also true/false for __new__() and __del__()?

有一个非常相似的问题:继承和在Python中覆盖__init__

There's a very similar question: Inheritance and Overriding __init__ in Python

推荐答案

在Python中，调用超类的__init__是可选的.如果您调用它，那么使用super标识符还是显式命名超类也是可选的:

In Python, calling the super-class' __init__ is optional. If you call it, it is then also optional whether to use the super identifier, or whether to explicitly name the super class:

object.__init__(self)

对于对象，由于super方法为空，因此不必严格要求调用super方法.与__del__相同.

In case of object, calling the super method is not strictly necessary, since the super method is empty. Same for __del__.

另一方面，对于__new__，您确实应该调用super方法，并将其返回值用作新创建的对象-除非您明确希望返回其他内容.

On the other hand, for __new__, you should indeed call the super method, and use its return as the newly-created object - unless you explicitly want to return something different.

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