[docs] [issue26001] Tutorial: write() does not expect string in binary mode

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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stage:  -> patch review
type:  -> enhancement
versions: +Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26001>
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