[Python-checkins] [python/cpython] 9c5684: bpo-28556: Various updates to typing (#28) (#78)

[GitHub]

  Branch: refs/heads/3.5
  Home:   https://github.com/python/cpython
  Commit: 9c5684e0d380cf5bc109888603756084588ce617
      https://github.com/python/cpython/commit/9c5684e0d380cf5bc109888603756084588ce617
  Author: Mariatta <Mariatta at users.noreply.github.com>
  Date:   2017-02-13 (Mon, 13 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) (#78)

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

* Add issue number

Contributed by Ivan Levkivskyi @ilevkivskyi

(cherry picked from commit b692dc8475a032740576129d0990ddc3edccab2b)