有没有简单，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中定义单身人士。堆栈溢出有一个共识吗？

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

推荐答案

我没有真正看到需要，作为一个功能模块（而不是一个班级）将作为一个单身人士。它的所有变量将被绑定到模块，无法反复实例化。

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，因此您无法保护多个实例化，除了只是通过惯例使用您的API。我仍然将方法放在模块中，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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