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fix(ciphers): add input validation and doctests to a1z26 encode and decode #14977

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fix(ciphers): add input validation and doctests to a1z26 encode and decode #14977

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12 changes: 12 additions & 0 deletions ciphers/a1z26.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,15 +13,27 @@ def encode(plain: str) -> list[int]:
"""
>>> encode("myname")
[13, 25, 14, 1, 13, 5]
>>> encode("HELLO")
Traceback (most recent call last):
...
ValueError: plain text must contain only lowercase letters 'a'-'z'
"""
if not plain or any(not ("a" <= elem <= "z") for elem in plain):
raise ValueError("plain text must contain only lowercase letters 'a'-'z'")
return [ord(elem) - 96 for elem in plain]


def decode(encoded: list[int]) -> str:
"""
>>> decode([13, 25, 14, 1, 13, 5])
'myname'
>>> decode([0, 27])
Traceback (most recent call last):
...
ValueError: encoded values must be integers between 1 and 26
"""
if not encoded or any(not (1 <= elem <= 26) for elem in encoded):
raise ValueError("encoded values must be integers between 1 and 26")
return "".join(chr(elem + 96) for elem in encoded)


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