Submission for SC consideration: PEP 585 "Type Hinting Generics In Standard Collections" #21

I'd like to ask the Steering Council for a decision whether this PEP should be accepted and implemented for Python 3.9.

I wrote this PEP last year and since then it got through several significant editing rounds. We have also done several discussion rounds, and there's a prototype implementation by @gvanrossum and @ethanhs.

PEP text

• https://www.python.org/dev/peps/pep-0585/

typing-sig discussion

• https://mail.python.org/archives/list/typing-sig@python.org/thread/5YDRDAN273O2L5YAPYK3DGN7EREH5N6Y/#2XZM7RWU3MFFAXAPAKZ6TDNIH732FWUV
• https://mail.python.org/archives/list/typing-sig@python.org/thread/A6G6OG3GV2D6HAMHAYG7HDRSWHOOHAT6/#LXTC7KHMS2J4VRLD3HN7EJZQHEBUBS5J
• https://mail.python.org/archives/list/typing-sig@python.org/thread/75TYWHHCLJ4CLWFLVME3EJHVLEYXFUGX/#75TYWHHCLJ4CLWFLVME3EJHVLEYXFUGX

python-dev discussion

• https://mail.python.org/archives/list/python-dev@python.org/thread/VYUM3GLXCDFKU6URHN5IPT2UTVESEO4B/#VYUM3GLXCDFKU6URHN5IPT2UTVESEO4B

prototype implementation

• bpo-39481: Implementation for PEP 585 cpython#18239; based on
• https://github.com/gvanrossum/cpython/tree/pep585