Walk through a multidimensional array again?

Question

Python

There is an array comp
How to go through it so that the counter shows the index 0 1 2 0 1 2?

comp=[1,2],[3,4],[5,6]
for i,data in enumerate(comp):
  for k in comp[i]:
    print(i)

Answer 1

for i in range(len(comp[0])):
  for j in range(len(comp)):
    print(j)