I usually give myself a `./exec` shell script that sources `./bin/activate` then `exec $SHELL $@`. That gives me a subshell with everything set up, so when I w

I usually give myself a `./exec` shell script that sources `./bin/activate` then `exec $SHELL $@`. That gives me a subshell with everything set up, so when I want out it's just Ctrl-D. Now that I'm used to the subshell idea, I use the same concept across ruby, node, and python; it's almost always a better fit than what the usual packaging tools give you. I don't need `bundle exec` in ruby, for instance.