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Added `Optional[]` around `key` argument to `itertools.groupby()` - #2790

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srittau merged 1 commit into

python:masterfrom

achampion:itertools-groupby-optional

Feb 12, 2019

Merged

Added `Optional[]` around `key` argument to `itertools.groupby()` #2790
srittau merged 1 commit into
python:masterfrom
achampion:itertools-groupby-optional

Commits on Feb 12, 2019
- Added `Optional[]` around the `itertools.groupby()` `key` attribute to allow `None` to pass the type
  
  Alun Champion
  authored and
  Alun Champion
  committed
  45dfa08