SciTools/iris — pull request #397 by cpelley (2013-03-14 14:14:50+00:00)
Title: corrected syntax for named tuple def

calling collections.namedtuple will return a subclass, meaning that the syntax used should be "CapWords" like any other class.

Currently iris has some which are capitalised.
http://www.python.org/dev/peps/pep-0008/#class-names

CapWords convention required to be followed.