Code cleanup

[travcunn]

Some of the code doesn't comply with PEP E501 and is somewhat difficult to read.

This is too difficult to read:

for category in [ name for name in os.listdir(self.graph_templates)
                                        if not name.startswith('.') and os.path.isdir(os.path.join(self.graph_templates, name)) ]:

I may end up cleaning up some things, so this might be more of a note to myself

[prfalken]

oh yeah 👍