Hey, I'm happy to say that I've just cut the releases of pip 7.0 and virtualenv 13.0 and I have uploaded them to PyPI. For the full list of changes go visit the respective changelogs, however the biggest change here is that in pip 7.0 when pip finds and downloads a sdist, instead of installing that sdist directly it will instead build a wheel of that and cache it locally. From then on out it will use that cached wheel to install instead of downloading and building the sdist each time. This can have a profound impact upon installation speed.
For instance, taking a look at the popular lxml library:
# Without a locally cached wheel
$ time pip install lxml
...
pip install lxml 36.00s user 1.40s system 98% cpu 38.117 total
# The next time, with a primed cache.
$ time pip install lxml
...
pip install lxml 0.61s user 0.10s system 94% cpu 0.750 total
Some important notes about this new feature:
* If the wheel project is not installed, then this feature will be disabled,
however get-pip.py and virtualenv both will now install wheel by default.
* If attempting to actually *build* the wheel fails for any reason, it will
fall back to the older method of simply installing the sdist directly.
* If a project cannot be installed correctly from a wheel, but it can
successfully build a wheel, you can disable using wheels for that project
by adding the flag --no-binary project1,project2,project3 to tell pip not to
use binaries for those projects. You can use the :all: psuedo identifier to
disable all wheels.
I'm pretty excited about this release, caching built wheels is going to result
in a tremendous speedup for a lot of common cases. As with any big change there
is a pretty good change that this will cause breakages for some percentage of
projects as well as have bugs within the system itself. As always, if you find
a bug please feel free to open an issue up on the pip issue tracker at
https://github.com/pypa/pip/issues.
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Donald Stufft
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