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Ali Satwat KhanChristian Clausspre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>* fix: raise ValueError in encode() for non-lowercase input encode() previously accepted uppercase letters, digits, and other non-lowercase characters silently, producing incorrect/out-of-range values (e.g. negative numbers for uppercase letters) instead of failing. Add input validation using str.islower() and str.isalpha() to raise a ValueError when the input isn't purely lowercase a-z. Added a doctest covering the new error case. * resolved doctest * Fix Ruff 0.16 lint failures * Enhance encode function error handling examples Update error handling in encode function to include examples for mixed case and invalid characters. * Fix indentation in test_cancer_data function * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci --------- Co-authored-by: Christian Clauss <cclauss@me.com> Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
50 lines
1.3 KiB
Python
50 lines
1.3 KiB
Python
"""
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Convert a string of characters to a sequence of numbers
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corresponding to the character's position in the alphabet.
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https://www.dcode.fr/letter-number-cipher
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http://bestcodes.weebly.com/a1z26.html
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"""
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from __future__ import annotations
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def encode(plain: str) -> list[int]:
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"""
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>>> encode("myname")
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[13, 25, 14, 1, 13, 5]
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>>> encode("abCd")
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Traceback (most recent call last):
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...
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ValueError: plain must contain only lowercase letters (a-z)
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>>> encode("n0w")
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Traceback (most recent call last):
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...
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ValueError: plain must contain only lowercase letters (a-z)
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>>> encode("later!")
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Traceback (most recent call last):
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...
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ValueError: plain must contain only lowercase letters (a-z)
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"""
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if not plain.islower() or not plain.isalpha():
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raise ValueError("plain must contain only lowercase letters (a-z)")
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return [ord(elem) - 96 for elem in plain]
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def decode(encoded: list[int]) -> str:
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"""
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>>> decode([13, 25, 14, 1, 13, 5])
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'myname'
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"""
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return "".join(chr(elem + 96) for elem in encoded)
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def main() -> None:
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encoded = encode(input("-> ").strip().lower())
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print("Encoded: ", encoded)
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print("Decoded:", decode(encoded))
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if __name__ == "__main__":
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main()
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