On Fri, Nov 3, 2017 at 7:45 AM, Chris Angelico <ros...@gmail.com> wrote:
> On Sat, Nov 4, 2017 at 1:35 AM, Guido van Rossum <gu...@python.org> wrote: > > [A copy from https://github.com/python/typing/issues/495 to get more > > people's attention to this issue.] > > > > I'm wondering if we should remove typing from the stdlib. Now's the time > to > > think about this, as the feature freeze for 3.7 is about 12 weeks away. > > > > Cons: > > > > People have to depend on a PyPI package to use typing (but they do anyway > > for typing_extensions) > > If the lazy evaluation of annotations (PEP 563) also lands in 3.7, > then this would be a very minor downside. You'd need to pip-install > typing as well as mypy *for the actual type checking*, but at run > time, you could ignore both (all those List[...] annotations would be > stored unevaluated). Otherwise, it'd mean that any project that makes > use of type hints would require typing as a run-time dependency. > This would not work if you use TypeVar, NewType, or any kind of type alias involving things imported from typing (e.g. Union or TypedDict). Also cast(). -- --Guido van Rossum (python.org/~guido)
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