Serhiy Storchaka added the comment:
You can use deflate for Python files and advanced compression methods for large
well-compressable package data.
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Changes by Serhiy Storchaka storch...@gmail.com:
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resolution: - duplicate
status: open - closed
superseder: - Expand zipimport to include other compression methods
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Serhiy Storchaka added the comment:
As shown in msg180323, using lzma compression for typical *.py and *.pyc
produces 8% less zip file, but reading from it is 2.5 times slower. The bzip2
compression is even worse. So there is no large benefit in supporting other
compression methods.
Donald Stufft added the comment:
I disagree that there is no large benefit. Python files aren't the only files
that could exist inside of a zip file. Supporting LZMA import (or bz2) would
make it easier to have LZMA or bzip2 wheels in the future without losing the
ability to import them.
Serhiy Storchaka added the comment:
For non-Python files you don't need support of bzip2 or lzma compression in
zipimport. Use zipfile which supports advanced compression.
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Donald Stufft added the comment:
I'm not sure what that statement means. There is package data that sits
alongside python files. These cannot use anything but DEFLATED because
zipimport doesn't support it.
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Eric Snow added the comment:
related: issue #17630
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Nick Coghlan added the comment:
Another use case is more aggressively shrinking the bundled copy of pip. We
don't really care about speed of execution there (since we only run it
directly once at install time to do the bootstrapping), but we do care
about the impact on the installer size.
New submission from Donald Stufft:
Since Python 3.3 the zipfile module has support bzip2 and lzma compression,
however the zipimporter does not support these. It would be awesome if
zipimport did support them.
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messages: 220477
nosy: brett.cannon, dstufft, eric.snow, ncoghlan
R. David Murray added the comment:
See also issue 17004 and issue 5950.
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nosy: +r.david.murray
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Brett Cannon added the comment:
Zipimporter doesn't use zipfile (the former is written in C), so it
unfortunately doesn't fall through for support.
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Donald Stufft added the comment:
Right, but it could still have support for those things implemented yea?
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Brett Cannon added the comment:
On Jun 13, 2014 7:39 PM, Donald Stufft rep...@bugs.python.org wrote:
Donald Stufft added the comment:
Right, but it could still have support for those things implemented yea?
Yes, it's just zipimport has a history of being difficult to maintain.
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