Python function attributes - uses and abuses

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Answer 1

I typically use function attributes as storage for annotations. Suppose I want to write, in the style of C# (indicating that a certain method should be part of the web service interface)

class Foo(WebService):
    @webmethod
    def bar(self, arg1, arg2):
         ...

then I can define

def webmethod(func):
    func.is_webmethod = True
    return func

Then, when a webservice call arrives, I look up the method, check whether the underlying function has the is_webmethod attribute (the actual value is irrelevant), and refuse the service if the method is absent or not meant to be called over the web.