Iterate through a list of lists

There are many ways to iterate through a list of lists in Python, this one is nice for some cases:

for i in range(len(mylist)):
  for j in range(len(mylist[i])):
    print(mylist[i][j])

but when there is no need for indexing the following will work perfectly:

for row in mylist:
  for x in row:
    print(x)