[issue16349] Document whether it's safe to use bytes for struct format string

[Mark Dickinson]

Mark Dickinson added the comment:

> Also it would be nice to clarify if struct.Struct.format is meant to be > a byte string.

Hmm.  That seems wrong to me.  After all, the format string is supposed to be a piece of human-readable text rather than a collection of bytes.  I think it's borderline acceptable to allow a bytes instance to be passed in for the format (practicality beats purity and all that), but I'd say that the output format should definitely be unicode.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16349>
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