[Distutils] Python 3.x Adoption for PyPI and PyPI Download Numbers

[Donald Stufft]

Just thought I'd share this since it shows how what people are using to
download things from PyPI have changed over the past year. Of particular
interest to most people will be the final graphs showing what percentage of
downloads from PyPI are for Python 3.x or 2.x.

As always it's good to keep in mind, "Lies, Damn Lies, and Statistics". I've
tried not to bias the results too much, but some bias is unavoidable. Of
particular note is that a lot of these numbers come from pip, and as of version
6.0 of pip, pip will cache downloads by default. This would mean that older
versions of pip are more likely to "inflate" the downloads than newer versions
since they don't cache by default. In addition if a project has a file which
is used for both 2.x and 3.x and they do a ``pip install`` on the 2.x version
first then it will show up as counted under 2.x but not 3.x due to caching (and
of course the inverse is true, if they install on 3.x first it won't show up
on 2.x).

Here's the link: https://caremad.io/2015/04/a-year-of-pypi-downloads/

Anyways, I'll have access to the data set for another day or two before I
shut down the (expensive) server that I have to use to crunch the numbers so if
there's anything anyone else wants to see before I shut it down, speak up soon.

---
Donald Stufft
PGP: 7C6B 7C5D 5E2B 6356 A926 F04F 6E3C BCE9 3372 DCFA

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