Enable pylint and flake8 warnings - #73

Aw man, I really wish you hadn't chosen such a small line length limit. 80 characters just seems unnecessary these days :-/
Any chance you might consider upping that?

It turned out that 80 characters is almost the maximum that can be displayed side by side without compromising readability on my editor of choice on a full HD monitor. So for this reason I'd like to stick to 80 characters. Myself I do find it limiting sometimes, but not enough to consider to switch. Sorry for declining your suggestion.

Alright, I'll learn to live with it I guess :-)
Did you do the formatting manually, or was that done by a tool?

There's autopep8, but I found it wraps lines at "wrong" places, so this time I did it manually.

I'm asking because I thought a few things were wrapped very weirdly. Would you be open to a couple small changes in that regard?

Could you give some links?

preprocess.py:131 or preprocess.py:224 for example, I think they'd look better when wrapped earlier. Or in preprocess_qch.py I'd move the enumerate into the next loop, since the index is not needed before that.

Agreed.

Great, then I'll do a PR sometime.