This is a simple global minor mode which will replicate the changes done by virtualenv activation inside Emacs.
The main entry points are pyvenv-activate, which queries the user
for a virtual environment directory to activate, and pyvenv-workon,
which queries for a virtual environment in $WORKON_HOME (from
virtualenvwrapper.sh).
virtualenv.el is the original virtualenv implementation for Emacs. I used it for a long time, but didn’t like some of the design decisions.
For example, it does not modify process-environment so does not set
a virtual environment for M-x compile and other external processes.
Also, M-x virtualenv-workon requires a prefix argument to actually
change the current virtual environment. And it does not support
virtualenvwrapper’s hooks, which I use to set up a working
environment.
All in all, too much magic for too little gain. So I figured I’d write my own. Still, it’s an excellent package and I’m very grateful to have used it for a long time.