python list comprehensions; compressing a list of lists?

Question

guys. I\'m trying to find the most elegant solution to a problem and wondered if python has anything built-in for what I\'m trying to do.

What I\'m doing is this. I

Answer 1

If listA=[list1,list2,list3]
flattened_list=reduce(lambda x,y:x+y,listA)

This will do.