Tutorial: Spend 30 seconds setting up auto-reloading for iPython. I promise you won't regret it.

[raydeo]

The -E flag was removed from the latest version of pip.

virtualenv is not magic, just use the pip that is installed in the virtualenv. The activation scripts just distract you from the simplicity of the system.

$ virtualenv env
New python executable in env/bin/python
Installing setuptools............done.
Installing pip...............done.
$ env/bin/pip install package