That's how I was doing it at one point. Fine for development but it gets tricky when trying to handle setup.py 

Pygments tip is not on pypi so in order to install the tip you need to add the dependency in dependency links and install it from there. However, dependency_links is deprecated and is not processed by default. 

This forces the user installing diff-cover to set a flag which seems bad to me. 

My experience with packaging is limited so I may be mistaken