[issue4963] mimetypes.guess_extension result changes after mimetypes.init()

[S Arrowsmith]

S Arrowsmith <siona at chiark.greenend.org.uk> added the comment:

I've dug into it -- again -- and my original analysis still holds. Getting consistent guess_extension() results across an explicit init() call depends on dict.items() returning keys in the same order on two different dictionaries (the original, hard-coded types_map and the one created by the first, implicit init() call).

Why should this be different on Debian to other Linuxes, even given same data as a "working" distribution? Is there something in the implementation details of dict.items() which is that distribution dependent?

(A "fix", BTW, is to insert a call to _default_mime_types() either in init() or in MimeTypes.__init__ before it calls init().)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4963>
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