[docs] [issue21071] struct.Struct.format is bytes, but should be str

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I think breaking the compatibility should be discussed on Python-Dev. Similar issue (and even worse) is issue8934.

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21071>
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