In a message of Wed, 14 Oct 2015 23:49:33 +0100, Oscar Benjamin writes: >I'm sure the bokeh developers will be aware of the different ways that >their library is used (at this level). If the input spec is "sequence of >coercible to float" then I agree that they should use type annotations to >match that rather than putting float and I imagine they would welcome your >PR. > >Guido's suggestion is not general enough for that though: what about >Fraction, mpf, gmpy, numpy, sympy, h5py etc? The ABCs in the numeric tower >are unused by 3rd party types making them useless for abstract type >inference (IMO). AFAIK the lowest common denominator among number types in >Python is the __float__ special method. Does mypy have a way to require (a >sequence of) that?
Thank you Oscar, and Chris Barker, and Guido for improving my thoughts on this matter. I go to bed now, pondering the idea that for me, internally, a new way to do type annotation 'to-x-or-is-coercible-to-x' seems a decent-enough idea. Seems a betrayal of earlier principles. Perhaps when I wake up I will feel differently. Off to dream about 'the meaning of type annotation' then. :) Thank you. Laura _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
