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Improve reverse letters validation #14534

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Improve reverse letters validation #14534

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f990d1b
Add input validation to reverse_letters function
shineyrbl-byte Apr 11, 2026
5d93c44
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Apr 11, 2026
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6 changes: 6 additions & 0 deletions strings/reverse_letters.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,12 @@ def reverse_letters(sentence: str, length: int = 0) -> str:
>>> reverse_letters("racecar")
'racecar'
"""
if not isinstance(sentence, str):
raise TypeError("sentence must be a string")

if not isinstance(length, int) or length < 0:
raise ValueError("length must be a non-negative integer")

return " ".join(
word[::-1] if len(word) > length else word for word in sentence.split()
)
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