Auto-reload in iPython

I've been meaning to do this for literally years.

Create an ipython profile if you do not already have one.

ipython profile create

Edit your profile (on osx it's at ~/.ipython/profile_default/ipython_config.py):

# These two lines will probably be commented out somewhere
c.InteractiveShellApp.exec_lines = ['%autoreload 2']
c.InteractiveShellApp.extensions = ['autoreload']

Say goodbye to exiting/restarting iPython every time your code changes.