trailing-comma-tuple / R1707#
Disallow trailing comma tuple
In Python, a tuple is actually created by the comma symbol, not by the parentheses. Unfortunately, one can actually create a tuple by misplacing a trailing comma, which can lead to potential weird bugs in your code. You should always use parentheses explicitly for creating a tuple.
COMPASS = "north", "south", "east", "west", # [trailing-comma-tuple]
COMPASS = ("north", "south", "east", "west")
Created by the refactoring checker.