有没有一种简单、优雅的方式来定义单身人士? [英] Is there a simple, elegant way to define singletons?

问题描述

似乎有很多方法可以在 Python 中定义单例.是否有关于 StackOverflow 的共识意见?

There seem to be many ways to define singletons in Python. Is there a consensus opinion on Stack Overflow?

推荐答案

我真的不认为有必要，因为带有函数(而不是类)的模块可以很好地用作单例.它的所有变量都将绑定到模块，无论如何都不能重复实例化.

I don't really see the need, as a module with functions (and not a class) would serve well as a singleton. All its variables would be bound to the module, which could not be instantiated repeatedly anyway.

如果您确实希望使用类，则无法在 Python 中创建私有类或私有构造函数，因此您无法防止多次实例化，只能通过 API 使用约定.我仍然只是将方法放在一个模块中，并将该模块视为单例.

If you do wish to use a class, there is no way of creating private classes or private constructors in Python, so you can't protect against multiple instantiations, other than just via convention in use of your API. I would still just put methods in a module, and consider the module as the singleton.

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