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

[Xiang Zhang]

Xiang Zhang added the comment:

+1 for change bytes to str. But struct.Struct() accepts both bytes and str, maybe in future buffer objects. When it gets a bytes object, converting it to a str looks unnecessary to me, and as OP said, comparison (a theoretical use case) could still fail. Could we just leave what the user passes in? bytes(bytes-like) -> bytes, str -> str. This looks more natural to me.

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nosy: +xiang.zhang

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<http://bugs.python.org/issue21071>
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