如何在__init__内更改类属性? [英] How to change a class attribute inside __init__?

问题描述

class Ant:
    count = 0

    def __init__(self):
        if count == 0:
            self.real = True
        else:
            self.real = False
        count += 1

所以基本上我想实现的是，我只希望此类的第一个实例的真实"属性为 True ，而随后的属性为 False .我知道现在这会给我 count 的unboundlocal错误.我该如何进行这项工作?

So basically what I want to achieve is I want only the first instance of this class to have the "real" attribute to be True, and the subsequent attributes to be False. I know right now this is going to give me unboundlocal error for count. How do I make this work?

推荐答案

将 count 更改为 Ant.count

由于 count 是类成员(在Ant类的所有实例之间共享)，并且不属于特定实例，因此应在类名的前缀下使用它.

As count is a class member (shared between all instances of Ant class) and does not belong to a specific instance you should use it with the prefix of the class name.

class Ant:
    count = 0

    def __init__(self):
        if Ant.count == 0:
            self.real = True
        else:
            self.real = False
        Ant.count += 1

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