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Pyupgrade to Python 3.9 (#4718)

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* Pyupgrade to Python 3.9

* updating DIRECTORY.md

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
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Christian Clauss
2021-09-07 13:37:03 +02:00
committed by GitHub
parent 5d5831bdd0
commit cecf43d648
142 changed files with 523 additions and 530 deletions
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project_euler/problem_014/sol2.py
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@ -25,10 +25,10 @@ that all starting numbers finish at 1.
Which starting number, under one million, produces the longest chain?
"""
from typing import List
from __future__ import annotations
def collatz_sequence(n: int) -> List[int]:
def collatz_sequence(n: int) -> list[int]:
"""Returns the Collatz sequence for n."""
sequence = [n]
while n != 1:
@ -54,7 +54,7 @@ def solution(n: int = 1000000) -> int:
13255
"""
result = max([(len(collatz_sequence(i)), i) for i in range(1, n)])
result = max((len(collatz_sequence(i)), i) for i in range(1, n))
return result[1]