[2.7] bpo-8765: Deprecate writing unicode to binary streams in Py3k mode.#11127

serhiy-storchaka merged 3 commits intopython:2.7python/cpython:2.7from

serhiy-storchaka:fileio-write-unicode-2.7serhiy-storchaka/cpython:fileio-write-unicode-2.7Copy head branch name to clipboard