```
def radix_sort(lst):
RADIX = 10
placement = 1
# get the maximum number
max_digit = max(lst)
while placement < max_digit:
# declare and initialize buckets
buckets = [list() for _ in range(RADIX)]
# split lst between lists
for i in lst:
tmp = int((i / placement) % RADIX)
buckets[tmp].append(i)
# empty lists into lst array
a = 0
for b in range(RADIX):
buck = buckets[b]
for i in buck:
lst[a] = i
a += 1
# move to next
placement *= RADIX
```