Activating cornice_sphinx

[karantan]

How does this

import cornice

sys.path.insert(0, os.path.abspath(cornice.__file__))
extensions = ['cornice_sphinx']

(ref: https://github.com/Cornices/cornice.ext.sphinx#activate-the-extension)

activate cornice_sphinx extension? The first 2 lines should not be required because cornice_sphinx should already be in sys.path. In case it is not, how does importing cornice help with that?