python代码语法问题

Question

    def __new__(cls):
        singleton = cls.__dict__.get('__singleton__')
        if singleton is not None:
            return singleton

        cls.__singleton__ = singleton = object.__new__(cls)

        return singleton

这是类单例实现代码，我想请问下这里的cls.__singleton__ = singleton = object.__new__(cls)是什么意思，如何理解

Answer 1

简单来说就是连续赋值。

a = b = 1
b = 1
a = b