Flatten a list in python

Question

I have a list like this:

[[(video1,4)], [(video2,5),(video3,8)], [(video1,5)], [(video5, 7), (video6,9)]...]

each item in this list may con

Answer 1

Here's another one (no libraries):

def plus(a,b): return a + b
reduce(plus, your_list)