[Python-checkins] [python/cpython] 0230e6: bpo-28556: Various updates to typing (#28) (#77)

[GitHub]

  Branch: refs/heads/3.6
  Home:   https://github.com/python/cpython
  Commit: 0230e64d2c976ab755c145e97bf86032e0fe3a53
      https://github.com/python/cpython/commit/0230e64d2c976ab755c145e97bf86032e0fe3a53
  Author: Mariatta <Mariatta at users.noreply.github.com>
  Date:   2017-02-14 (Tue, 14 Feb 2017)

  Changed paths:
    A Lib/test/mod_generics_cache.py
    M Lib/test/test_typing.py
    M Lib/typing.py
    M Misc/NEWS

  Log Message:
  -----------
  bpo-28556: Various updates to typing (#28) (#77)

various updates from upstream python/typing repo:

- Added typing.Counter and typing.ChainMap generics
- More flexible typing.NamedTuple
- Improved generic ABC caching
- More tests
- Bugfixes
- Other updates
* Add Misc/NEWS entry


(cherry picked from commit b692dc8475a032740576129d0990ddc3edccab2b)