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Turn a Function Into a Class (Python recipe) by Eric Snow
ActiveState Code (http://code.activestate.com/recipes/577822/)

The only catch is that the function has to return locals() at the end. And it doesn't do the __prepare__ part of 3.x metaclasses.

Python, 19 lines
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def as_class(*bases, metaclass=type, **kwargs):
    def decorator(f):
        namespace = f()
        if "__doc__" not in namespace:
            namespace["__doc__"] = f.__doc__
        return metaclass(f.__name__, bases, namespace)
    return decorator

@as_class(object)
def X():
    def __init__(self, name):
        self.__name__ = name
    def __str__(self):
        return self.__name__
    return locals()

x=X("something")
assert x.__name__ == "something"
print(x)

It wouldn't be too hard to make this technique even more authentic. Also, making the call syntax optional for the decorator factory is pretty simple.

Tags: classes, functions