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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 5a2692911a43 by Ezio Melotti in branch '3.5':
#26001: mention in the tutorial that files in binary mode expect bytes, not str.
https://hg.python.org/cpython/rev/5a2692911a43

New changeset 4b434a4770a9 by Ezio Melotti in branch 'default':
#26001: merge with 3.5.
https://hg.python.org/cpython/rev/4b434a4770a9

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nosy: +python-dev

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<http://bugs.python.org/issue26001>
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