Some packages in Gentoo support being installed for several Python versions at
the same time. One of these packages is
dev-python/pyinotify. If you look at
the ebuild (file
you stumble upon these lines:
PYTHON_DEPEND="*:2.5" SUPPORT_PYTHON_ABIS="1" RESTRICT_PYTHON_ABIS="2.4"
These lines tell that pyinotify 0.9.1 is expected to handle Python 2.5, 2.6,
2.7 and 3.0, 3.1, and 3.2. They are discussed in detail in the
Gentoo Python Developers Guide.
When installing pyinotify 0.9.1 with no
USE_PYTHON line in
by default you will get files for the active version of Python 2.x and Python
3.x. This line of the python eclass (file
There is three different active versions of python in Gentoo: one active version for 2.x and 3.x and third, a main active version from either pool, 2.6 in my case. These commands are meant to illustrate this:
# eselect python list --python2 Available Python 2 interpreters:  python2.6 *  python2.7 # eselect python list --python3 Available Python 3 interpreters:  python3.1 * # eselect python list Available Python interpreters:  python2.6 *  python2.7  python3.1
So with no specification of
/etc/make.conf I would get
pyinotify installed for Python 2.6 and python 3.1. As I want to have support
for Python 2.7 too, I have this line in my
USE_PYTHON="2.6 2.7 3.1"
This is what it gets me:
# equery f dev-python/pyinotify | grep site-packages /usr/lib64/python2.6/site-packages /usr/lib64/python2.6/site-packages/pyinotify-0.9.1-py2.6.egg-info /usr/lib64/python2.6/site-packages/pyinotify.py /usr/lib64/python2.7/site-packages /usr/lib64/python2.7/site-packages/pyinotify-0.9.1-py2.7.egg-info /usr/lib64/python2.7/site-packages/pyinotify.py /usr/lib64/python3.1/site-packages /usr/lib64/python3.1/site-packages/pyinotify-0.9.1-py3.1.egg-info /usr/lib64/python3.1/site-packages/pyinotify.py
NOTE : After changing
USE_PYTHON, don't forget to run
It will rebuild packages that have too little (or too much) support for Python
in its current form of installation. Besides, did I mention the Python team is
lacking man and woman power?