On Thu, Sep 22, 2016 at 12:35 PM, אלעזר <elaz...@gmail.com> wrote:
> In such a hypothetical future world we might come to allow, e.g. >> `Sequence[#CustomThing]` where some general lazy facility or indirection is >> indicated by the '#' (just a placeholder for this comment, not a >> proposal). But if that comes about, it should be available everywhere, not >> only in annotations. >> > > I generally agree, but this future world must be very far and has many > consequences, whereas the story of annotations is special in that it's not > actually an expression, to the reader. > The CPython developers (of whom I'm not one, but I've followed them closely for 18 years) place a high value on simplicity in the parser and interpreter. Adding a new custom type of thing that is an "annotation object" would be a special case with a high burden to show its utility. My feeling is that this burden is actually lower for a new "delayed eval object" that might conceivably be added at a syntax level. In some sense, this would add just as much complexity as a new annotation object, but it would be something that applies many places and hence perhaps be worth the added complexity. -- Keeping medicines from the bloodstreams of the sick; food from the bellies of the hungry; books from the hands of the uneducated; technology from the underdeveloped; and putting advocates of freedom in prisons. Intellectual property is to the 21st century what the slave trade was to the 16th.
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