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changshengpre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>changshengChristian Clauss* Add type hints to pancake_sort function * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Use modern list[int] type hint instead of deprecated typing.List * Update pancake_sort to use Sequence and TypeVar Refactor pancake_sort function to accept any sequence type. * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Make pancake_sort generic with type parameter T --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: changsheng <changsheng0804-blip@users.noreply.github.com> Co-authored-by: Christian Clauss <cclauss@me.com>
45 lines
1.2 KiB
Python
45 lines
1.2 KiB
Python
"""
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This is a pure Python implementation of the pancake sort algorithm
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For doctests run following command:
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python3 -m doctest -v pancake_sort.py
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or
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python -m doctest -v pancake_sort.py
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For manual testing run:
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python pancake_sort.py
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"""
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from collections.abc import Sequence
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from typing import TypeVar
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T = TypeVar("T")
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def pancake_sort[T](arr: Sequence[T]) -> list[T]:
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"""Sort Array with Pancake Sort.
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:param arr: Collection containing comparable items
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:return: Collection ordered in ascending order of items
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Examples:
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>>> pancake_sort([0, 5, 3, 2, 2])
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[0, 2, 2, 3, 5]
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>>> pancake_sort([])
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[]
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>>> pancake_sort([-2, -5, -45])
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[-45, -5, -2]
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"""
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cur = len(arr)
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while cur > 1:
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# Find the maximum number in arr
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mi = arr.index(max(arr[0:cur]))
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# Reverse from 0 to mi
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arr = arr[mi::-1] + arr[mi + 1 : len(arr)]
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# Reverse whole list
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arr = arr[cur - 1 :: -1] + arr[cur : len(arr)]
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cur -= 1
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return arr
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if __name__ == "__main__":
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user_input = input("Enter numbers separated by a comma:\n").strip()
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unsorted = [int(item) for item in user_input.split(",")]
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print(pancake_sort(unsorted))
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