No module named constants

hop of those help? Well, it depends. Usually, constants are defined at module level. But if you have many constants for category_a and category_b, it might even make sense to add a subpackage constants with modules constants.category_a and constants.category_b.
I would refrain from using a class - it could be instanciated, which wouldn't make sense, and it has no advantage over a module apart from allowing you to cram more than one into one physical file (which you propably shouldn't if there are so many constants). The Java version would propably use a static class, but the Python equivalent is a module.

I hope this helps you . @stwhite I suggest you to use virtualenv (http://www.virtualenv.org/en/latest/index.html) for multiple projects to live in their own environments.
Usefull wrapper for virtualenv http://www.doughellmann.com/projects/virtualenvwrapper/

First install XCode with gcc support,
deactivate <virtualenv_name>
cd ../ (virtualenvs root)
pip install -E <virtualenv_name/> PIL

around this issue You need to write a type definition file for links.js, maybe vue is using --noImplicityAny or --strict when pulling in your imports, which you might be able to turn off.