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From: Donald Stufft <donald@stufft.io>
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Subject: Released: pip 7.0 and virtualenv 13.0
Date: Fri, 22 May 2015 00:21:47 -0400
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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. =46rom 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.

---
Donald Stufft
PGP: 7C6B 7C5D 5E2B 6356 A926 F04F 6E3C BCE9 3372 DCFA


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