Repeating elements in list comprehension

Question

I have this list comprehension:

[[x,x] for x in range(3)]

which results in this list:

[[0, 0], [1, 1], [2, 2]]

Answer 1

My solution:

def explode_list(p,n):
    arr=[]
    track=0

    if n==0:
        return arr    
    while track