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Author The Compiler
Recipients The Compiler, Tom.Christie, ajaksu2, cvrebert, david.lindquist, elesbom, eric.araujo, evanj, ezio.melotti, jlgijsbers, kxroberto, lambacck, leos, martin.panter, ptarjan, sandro.tosi, sascha_silbe, wichert
Date 2021-01-04.20:21:06
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <1609791666.61.0.283313894323.issue1043134@roundup.psfhosted.org>
In-reply-to
Content 
I think this has been fixed in Python 3.7+ via https://github.com/python/cpython/pull/14375 - at least for a couple of types.

Comparing Python 3.6 with the current state, the following changed (which can be used as an "override" dict before calling mimetypes.guess_extension):

    "application/manifest+json": ".webmanifest",  # not None
    "application/octet-stream": ".bin",  # not .a
    "application/postscript": ".ps",  # not .ai
    "application/vnd.ms-excel": ".xls",  # not .xlb
    "application/vnd.ms-powerpoint": ".ppt",  # not .pot
    "application/wasm": ".wasm",  # not None
    "application/x-hdf5": ".h5",  # not None
    "application/xml": ".xsl",  # not .rdf
    "audio/mpeg": ".mp3",  # not .mp2
    "image/jpeg": ".jpg",  # not .jpe
    "image/tiff": ".tiff",  # not .tif
    "text/html": ".html",  # not .htm
    "text/plain": ".txt",  # not .bat
    "video/mpeg": ".mpeg",  # not .m1v
History
Date User Action Args
2021-01-04 20:21:06The Compilersetrecipients: + The Compiler, jlgijsbers, kxroberto, ajaksu2, wichert, ezio.melotti, eric.araujo, lambacck, cvrebert, sascha_silbe, evanj, ptarjan, sandro.tosi, leos, elesbom, martin.panter, david.lindquist, Tom.Christie
2021-01-04 20:21:06The Compilersetmessageid: <1609791666.61.0.283313894323.issue1043134@roundup.psfhosted.org>
2021-01-04 20:21:06The Compilerlinkissue1043134 messages
2021-01-04 20:21:06The Compilercreate