GaelVaroquaux/nipy — comment on commit 7aa3ea37e0b65e312193e5d4a9f1eaf8f755b61b
File: nipy/labs/mask.py line 301
By matthew-brett:

Using the loop variable seems confusing to me. Is it guaranteed by CPython to be the last value after exiting the loop? `mean /= len(session_files)` might be easier to follow.