singleton decorator

[Andre Meyer]

While looking for an elegant implementation of the singleton design pattern I came across the decorator as described in PEP318.
Unfortunately, the following does not work, because decorators only work on functions or methods, but not on classes.

def singleton(cls):
    instances = {}
    def getinstance():
        if cls not in instances:
            instances[cls] = cls()

        return instances[cls]
    return getinstance

@singleton
class MyClass:
    ...

Am I missing something here? What is the preferred pythonic way of implementing singleton elegantly?

Thanks for your help
André

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