I'm starting to use python and would like to setup my workstation which is running on linux (debian). Multiple version of python are installed:
ot@station:/home/ot# ls -l /usr/bin/py
py3clean pydoc3.4 python2 python3.4m-config
py3compile pygettext python2.6 python3-config
py3versions pygettext2.7 python2.7 python3m
pybuild pygettext3 python2.7-config python3m-config
pyclean pygettext3.4 python2-config python-config
pycompile pygmentex python3 pythontex
pydoc pygmentize python3.4 pythontex3
pydoc2.7 pyste python3.4-config pyversions
pydoc3 python python3.4m
root@thinkstation:/home/nicolas# ls -l /usr/bin/py
My first question is regarding the package management system pip. I see the following output:
ot@station:/home/ot# pip
pip pip2 pip2.7
How can I check which pip is used for which python version? They must be linked somehow. From the output above I guess pip2.7 is used for the installed version of python2.7. But what about the others? Why isnt there a pip2.6 and how can I use pip to install packages for the newest version (python 3.4?).
Once this is sorted out I would like to start some coding projects for which virtualenv seems extremely helpful. At this point I know which pip links to which python version. If my project should run under python3 I use the corresponding pip to install virtualenv and virtualenvwrapper. This implies there are different version of virtualenv and virtualenvwrapper on my local machine. How can I then use the right one for creating local environment?
sudo apt-get install python3-pip # install pip3
pip3 install virtualenv
virtualenv venv # create virtualenv called venv
source /venv/bin/activate # activate the virtualenv
pip install xyz
[...]
deactivate
Note: to install packages within the virtual environment you simply use pip, even if its an python3 environment.
For further info on pip versions check out this post.