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Raise ValueError for invalid A1Z26 input #14974

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Raise ValueError for invalid A1Z26 input #14974

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21 changes: 21 additions & 0 deletions ciphers/a1z26.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,12 +8,33 @@

from __future__ import annotations

import string


def encode(plain: str) -> list[int]:
"""
>>> encode("myname")
[13, 25, 14, 1, 13, 5]

>>> encode("")
Traceback (most recent call last):
...
ValueError: Input must contain only lowercase letters a-z.

>>> encode("HELLO")
Traceback (most recent call last):
...
ValueError: Input must contain only lowercase letters a-z.

>>> encode("hi there")
Traceback (most recent call last):
...
ValueError: Input must contain only lowercase letters a-z.
"""

if not plain or any(ch not in string.ascii_lowercase for ch in plain):
raise ValueError("Input must contain only lowercase letters a-z.")

return [ord(elem) - 96 for elem in plain]


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