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[mypy] Fixes Fisher Yates shuffle and extends annotations #5653

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[mypy] Fixes Fisher Yates shuffle and extends annotations #5653

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2cc5cf4
fischer_yates_shuffle: fixes bug introduced by partial renaming in #4673
spazm Oct 29, 2021
644f534
fischer_yates_shuffle: aligns arrays in test output to simplify compa…
spazm Oct 29, 2021
487a687
[mypy] adds a generic typevar for fisher yates list shuffle
spazm Oct 29, 2021
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17 changes: 10 additions & 7 deletions other/fischer_yates_shuffle.py
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Expand Up @@ -6,19 +6,22 @@
wikipedia/Fischer-Yates-Shuffle.
"""
import random
from typing import TypeVar

T = TypeVar('T')

def fisher_yates_shuffle(data: list) -> list:
for _ in range(len(list)):
a = random.randint(0, len(list) - 1)
b = random.randint(0, len(list) - 1)
list[a], list[b] = list[b], list[a]
return list

def fisher_yates_shuffle(data: list[T]) -> list[T]:
for _ in range(len(data)):
a = random.randint(0, len(data) - 1)
b = random.randint(0, len(data) - 1)
data[a], data[b] = data[b], data[a]
return data


if __name__ == "__main__":
integers = [0, 1, 2, 3, 4, 5, 6, 7]
strings = ["python", "says", "hello", "!"]
print("Fisher-Yates Shuffle:")
print("List", integers, strings)
print("Lists ", integers, strings)
print("FY Shuffle", fisher_yates_shuffle(integers), fisher_yates_shuffle(strings))