On 11.09.15 00:36, yury.selivanov wrote:
https://hg.python.org/cpython/rev/3265f33df731
changeset:   97874:3265f33df731
branch:      3.5
parent:      97872:70c97a626c41
user:        Yury Selivanov <yseliva...@sprymix.com>
date:        Thu Sep 10 17:35:38 2015 -0400
summary:
   whatsnew/3.5: Editorialization pass on library section

Patch by Elvis Pranskevichus

  io
  --

-* New Python implementation of :class:`io.FileIO` to make dependency on
-  ``_io`` module optional.
-  (Contributed by  Serhiy Storchaka in :issue:`21859`.)
+:class:`io.FileIO` has been implemented in Python which makes C implementation
+of :mod:`io` module entirely optional. (Contributed by  Serhiy Storchaka
+in :issue:`21859`.)

Unfortunately this is not true. Python implementation is required to make the _io module optional, but it is not enough. io and _pyio still depend from _io (issue17984).

May be it is not worth to mention this change at all. End users unlikely will encounter Python implementation.

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