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While coding in Python, I wanted to make a class become a singleton class, ie a class that can only have one instance. So I’ve looked around and found some singleton decorators. For the most part, they worked fine, but on some occasions, the classes I created with them did not behave as usual classes would. And the reason was that the singleton classes created with these decorators weren’t classes, but callable objects that return an object of the class on which the singleton decorator was called.