I'm doing some work implementing YTEP-6 and have noticed a pattern that happens many times in the code. Specifically, many of the files in the yt source tree import everything in yt.funcs at the top. I can see why this would be helpful when writing routines, but I'd argue that this just makes it harder to understand where things are defined.
I've pasted a list of all occurrences in the 2.X branch here: https://gist.github.com/4637442
I'm writing the list to check whether yt.funcs is imported this way for a non-obvious reason. If not, I'll file a bug about this so we can try to come back and make the imports explicit.
Nathan Goldbaum Graduate Student Astronomy & Astrophysics, UCSC firstname.lastname@example.org http://www.ucolick.org/%7Egoldbaum