[Python-3000] Draft pre-PEP: function annotations

[Paul Prescod]

On 8/11/06, Collin Winter <collinw at gmail.com> wrote:
>
> >>> def chain(*decorators):
> >>>     assert len(decorators) >= 2
> >>>
> >>>     def decorate(function):
> >>>         sig = function.__signature__
> >>>         original = sig.annotations
> >>>
> >>>         for i, dec in enumerate(decorators):
> >>>             fake = dict((p, original[p][i]) for p in original)
> >>>
> >>>             function.__signature__.annotations = fake
> >>>             function = dec(function)
> >>>
> >>>         function.__signature__.annotations = original
> >>>         return function
> >>>     return decorate


I must be confused. This is a function returning a function. Does that mean
that the thing showing up in the __signatures__ dictionary is a function? Or
does the caller need to use two sets of parentheses to call the factory
function and then the inner function?

 Paul Prescod
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