Converting integer to digit list

Question

What is the quickest and cleanest way to convert an integer into a list?

For example, change 132 into [1,3,2] an

Answer 1

num = list(str(100))
index = len(num)
while index > 0:
    index -= 1
    num[index] = int(num[index])
print(num)

It prints [1, 0, 0] object.