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

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

3.0, WinXP
import mimetypes
print(mimetypes.guess_extension('image/jpeg'))
mimetypes.init()
print(mimetypes.guess_extension('image/jpeg'))
gives
.jpe
.jpe

I wonder at this answer since .jpg and occasionally .jpeg is standard in
Windows usage, but the doc is unclear to me as to the actual intent of
the function.

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nosy: +tjreedy

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