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[mypy] Add/fix type annotations for quick_sort(#4085) #4215

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Merged
merged 1 commit into from
Feb 20, 2021
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[mypy] Add/fix type annotations for quick_sort(#4085) #4215

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5 changes: 3 additions & 2 deletions sorts/quick_sort.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
For manual testing run:
python3 quick_sort.py
"""
from typing import List


def quick_sort(collection: list) -> list:
Expand All @@ -26,8 +27,8 @@ def quick_sort(collection: list) -> list:
if len(collection) < 2:
return collection
pivot = collection.pop() # Use the last element as the first pivot
greater = [] # All elements greater than pivot
lesser = [] # All elements less than or equal to pivot
greater: List[int] = [] # All elements greater than pivot
lesser: List[int] = [] # All elements less than or equal to pivot
for element in collection:
(greater if element > pivot else lesser).append(element)
return quick_sort(lesser) + [pivot] + quick_sort(greater)
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