[TIP] coverage.py with Py2 and Py3

[Mark Sienkiewicz]

Sean Robinson wrote:
>   I read the virtualenv docs earlier this morning and I had decided it
> was not what I was looking for, but I'll give it a closer look.  Is
> virtualenv what others are using for this type of situation?
>   

I don't.  When I have different versions of python, I install them in 
different directories and use an alias to set PATH/PYTHONPATH to select 
the python interpreter I want.

Each python environment is entirely unaware of the existence of the 
other.  So, for python version X, you can install coverage.  Then for 
python version Y, you also install coverage.  The coverage script ends 
up in /usr/local/pythonX/bin/coverage and starts off 
#!/usr/local/pythonX/bin/python (and similarly for Y).

I also make extensive use of --home when installing python packages:

export PYTHONPATH=$HOME/py2.6/lib/python
export PATH=$HOME/py2.6/bin:$PATH
python2.6 setup.py install --home ~/py2.6

export PYTHONPATH=$HOME/py2.7/lib/python
export PATH=$HOME/py2.7/bin:$PATH
python2.7 setup.py install --home ~/py2.7

This works if you have python installed in ~/py2.7 or if you are using 
it out of /usr/bin/python2.7.

Mark S.