[docs] [issue16724] Define `binary data` representation in Python

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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nosy:  -serhiy.storchaka
versions:  -Python 3.1, Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16724>
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