Merge 3 lists into 1 list

Question

I want to merge 3 lists in to a single list. For example, I have three lists:

a = [0, 3, 6, 9]
b = [1, 4, 7, 10]
c = [2, 5, 8, 11]

and fina

Answer 1

a = [0, 3, 6, 9]
b = [1, 4, 7, 10]
c = [2, 5, 8, 11]
d=[]
print [j  for i in zip(a,b,c) for j in i]

Output:[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]