Python/sorts/radix_sort.py

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Python
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from typing import List
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def radix_sort(list_of_ints: List[int]) -> List[int]:
"""
radix_sort(range(15)) == sorted(range(15))
True
radix_sort(reversed(range(15))) == sorted(range(15))
True
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radix_sort([1,100,10,1000]) == sorted([1,100,10,1000])
True
"""
RADIX = 10
placement = 1
max_digit = max(list_of_ints)
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while placement <= max_digit:
# declare and initialize empty buckets
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buckets = [list() for _ in range(RADIX)]
# split list_of_ints between the buckets
for i in list_of_ints:
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tmp = int((i / placement) % RADIX)
buckets[tmp].append(i)
# put each buckets' contents into list_of_ints
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a = 0
for b in range(RADIX):
for i in buckets[b]:
list_of_ints[a] = i
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a += 1
# move to next
placement *= RADIX
return list_of_ints