Given array representing a digit (123 = [1, 2, 3]) write a function to increment the number by 1 digit. Source problem: https://www.youtube.com/watch?v=gcxyiFoEpyU

array_incr.py

# Given array representing a digit (123 = [1, 2, 3]) write a function to increment the number by 1 digit

def incr(a):
    l = 8
    for i in range(len(a) - 1, -1, -1):
        a[i] += l
        l = a[i] / 10
        a[i] = a[i] % 10
        if l == 0:
            break

    if l > 0:
        a = [l] + a

    return a

print(incr([9,9,9]))
print(incr([1,2,3]))
print(incr([5,2,8]))
print(incr([5,9,1]))
print(incr([5,9,9]))
print(incr([1,1,2]))
print(incr([1,1]))
print(incr([4]))
print(incr([9]))