Nothing, it works. :) Thanks B! PyDev is also OK with : [(k, x) for (k, v) in d.iteritems() for x in v] , which is really what I wanted. On 10/15/2012 03:29 PM, Brian Ray wrote: > Are you sure they are using the same python version. > > What is wrong with: [(k, x) for x in [d[k] for k in d]] >