[issue18854] is_multipart and walk should document their treatment of 'message' parts.

[R. David Murray]

R. David Murray added the comment:

Using _structure is a great idea.  I'm not so fond of the full example, but I'll have to contemplate the text to decide what I'd rather do.  Probably I'll take this patch of yours and tweak it, rather than try to tell you what I want :)  Thanks for the patch!

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assignee:  -> r.david.murray
stage: needs patch -> commit review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18854>
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