What's a good way to provide additional decoration/metadata for Python function parameters?

Question

We\'re considering using Python (IronPython, but I don\'t think that\'s relevant) to provide a sort of \'macro\' support for another application, which controls a piece of equip

Answer 1

I would use some kind of decorator:

class TypeProtector(object):
    def __init__(self, fun, types):
        self.fun, self.types = fun, types
    def __call__(self, *args, **kwargs)
        # validate args with self.types
        pass
        # run function
        return fun(*args, **kwargs)

def types(*args):
    def decorator(fun):
        # validate args count with fun parameters count
        pass
        # return covered function
        return TypeProtector(fun, args)
    return decorator

@types(Time, Temperature)
def myfunction(foo, bar):
    pass

myfunction('21:21', '32C')
print myfunction.types