vec = [[1,2,3], [4,5,6], [7,8,9]] print [num for elem in vec for num in elem] <----- this >>> [1, 2, 3, 4, 5, 6, 7, 8, 9] This is tricking me out. I understand elem is the lists inside of the list from for elem in vic I don't quite understand the usage of num and for num in elem in the beginning and the end. How does python interpret this? What's the order it looks at? Continue reading...
