Python：如何使用类方法在__init__函数中定义变量？ [英] Python: How to define a variable in an __init__ function with a class method?

问题描述

class TextToNumbers():
    def __init__(self, number):
        self.text = str(number)
        self.chunks = parse_text_to_chunks(self.text)

    def parse_text_to_chunks(text_to_parse):
        #stuff

$ b b

这是我正在构建的类的示例。我想让它定义一些变量与类方法初始化。 （至少我认为这是我想要的）我想如果我谈论我的最终目标是，我有一组复杂的信息，需要在初始化时直接提供一个类。如何在初始化时调用类方法来定义类变量？

This is an example of a class I'm building. I want it to define some variables with class methods on initialization. (at least I think that is what I want) I think if I talk about my end goal it is that I have a set of complex information that needs to be available about a class directly at initialization. How do I call a class method at initialization, to define a class variable?

推荐答案

如果您正在寻找一种方法调用一个实例方法在初始化期间，您可以使用 self 来调用像这样

If you are looking for a way to call an instance method during initialization, you can use self to call that like this

class TextToNumbers():
    def __init__(self, number):
        self.text = str(number)
        self.chunks = self.parse_text_to_chunks(self.text)
        print self.chunks

    def parse_text_to_chunks(self, text_to_parse):
    # 1st parameter passed is the current INSTANCE on which this method is called
        self.var1 = text_to_parse[1:]
        return self.var1

TextToNumbers(123)

我相信这是你真正需要的。但是如果你想要一个类方法

And I believe this is what you really need. But if you want a class method

class TextToNumbers():
    def __init__(self, number):
        self.text = str(number)
        self.chunks = TextToNumbers.parse_text_to_chunks(self.text)
        print self.chunks

    @classmethod
    def parse_text_to_chunks(cls, text_to_parse):
    # 1st parameter passed is the current CLASS on which this method is called
        cls.var1 = text_to_parse[1:]
        return cls.var1

TextToNumbers(123)

但是没有必要创建一个类方法来初始化一个类变量在 __ init __ 中，因为类变量由该类的所有实例共享，所以从 __ init __ 一个对象被创建。

But there is no point in creating a class method to initialize a class variable in __init__, since a class variable is shared by all the instances of the class, calling from __init__ will overwrite everytime an object is created.

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