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fdf095f69f
* Update annotations to Python 3.10 #4052 * Add floats doctest * Copy list to avoid changing input unpredictably * Refactor code to make it readable * updating DIRECTORY.md * Improve raised ValueErrors and add doctest * Split doctest in multiples lines * Change ValueError to Monogons and Digons are not poly * Correct doctest refering number of sides Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
45 lines
1.3 KiB
Python
45 lines
1.3 KiB
Python
from __future__ import annotations
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def check_polygon(nums: list[float]) -> bool:
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"""
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Takes list of possible side lengths and determines whether a
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two-dimensional polygon with such side lengths can exist.
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Returns a boolean value for the < comparison
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of the largest side length with sum of the rest.
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Wiki: https://en.wikipedia.org/wiki/Triangle_inequality
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>>> check_polygon([6, 10, 5])
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True
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>>> check_polygon([3, 7, 13, 2])
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False
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>>> check_polygon([1, 4.3, 5.2, 12.2])
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False
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>>> nums = [3, 7, 13, 2]
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>>> _ = check_polygon(nums) # Run function, do not show answer in output
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>>> nums # Check numbers are not reordered
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[3, 7, 13, 2]
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>>> check_polygon([])
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Traceback (most recent call last):
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...
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ValueError: Monogons and Digons are not polygons in the Euclidean space
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>>> check_polygon([-2, 5, 6])
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Traceback (most recent call last):
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...
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ValueError: All values must be greater than 0
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"""
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if len(nums) < 2:
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raise ValueError("Monogons and Digons are not polygons in the Euclidean space")
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if any(i <= 0 for i in nums):
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raise ValueError("All values must be greater than 0")
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copy_nums = nums.copy()
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copy_nums.sort()
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return copy_nums[-1] < sum(copy_nums[:-1])
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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