Hi all. I have a list that looks like [['N', 'F'], ['E'], ['D']] I try to make it flat one: ['N', 'F', 'E', 'D'] How can I archieve such an effect with list comprehension? Two cycles did the job, but that way did not look pythonic.. I tried print [x for x in y for y in c_vars] and got NameError: name 'y' is not defined. -- Timothy Babytch