While developing two or more projects at the same time, it is unavoidable to switch among projects which may use the same python package of different version. In order to resolve the headache of package management, virtualenv is designed to create isolated python environments.
Install virtualenv
Open your terminal and execute
pip3 install virtualenv virtualenvwrapper
where virtualenvwrapper is a set of extension of virtualenv.
Set environment variables
In ~/.profile, add the lines below :
export VIRTUALENVWRAPPER_PYTHON=/usr/local/bin/python3
export WORKON_HOME=$HOME/.virtualenvs
source /usr/local/bin/virtualenvwrapper.sh
Followed by reloading ~/.profile :
source ~/.profile
Some examples of usage
To create a new project environment named vision with python 3.4 support :
$ mkvirtualenv -p /usr/local/bin/python3.4 vision
In case we want to install ipython under vision environment :
pip install ipython[notebook]
To leave the environment of current project :
deactivate
To work on a existed project :
workon project_name
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