Éric Araujo <mer...@netwok.org> added the comment:

I should add that a doc update will be part of the next patch.

In parallel, I’ve also started updating packaging to add lzma support to the 
bdist command, but the situation is very disappointing: tarfile knows what 
format it supports, shutil has its own list, and packaging has a few duplicates 
too!  Ideally, tarfile should have an attribute to expose what compression 
formats are available, then shutil would reuse that, and packaging would just 
call shutil.  (I’m not even talking about the duplication in the doc.)  If you 
agree with the general idea, I’ll open reports to a) add the attribute to 
tarfile b) rework the (luckily internal) registries in shutil to stop being 
hard-coded c) remove packaging’s registries.

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<http://bugs.python.org/issue5411>
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