Combining of two lists in python [closed]

Question

I have two lists with elements and an empty list:

l1 = [1,2,3,4,5,6]
l2 = [7,8,9]
l3 = []

How can I add the elements of l1 and l2 into l3, like that:

l3 = [1,7,2,8,3,9,4,5,6]

Answer 1

l1 = [1,2,3,4,5,6]
l2 = [7,8,9]
l3 = []


for i in range(len(l1)):     #iterates through indices of l1
    l3.append(l1[i])         #adds elements of l1 to l3 for index currently in loop for
    if l2:                   #if l2 is still not empty...
        l3.append(l2.pop(0)) #removes first element from l2 and adds it to l3 

print(l3)                    #outputs [1, 7, 2, 8, 3, 9, 4, 5, 6]