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Use list accumulation in rot13.py #14797

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Use list accumulation in rot13.py #14797

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12 changes: 7 additions & 5 deletions ciphers/rot13.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,15 +9,17 @@ def dencrypt(s: str, n: int = 13) -> str:
>>> dencrypt(s) == msg
True
"""
out = ""
out = []

for c in s:
if "A" <= c <= "Z":
out += chr(ord("A") + (ord(c) - ord("A") + n) % 26)
out.append(chr(ord("A") + (ord(c) - ord("A") + n) % 26))
elif "a" <= c <= "z":
out += chr(ord("a") + (ord(c) - ord("a") + n) % 26)
out.append(chr(ord("a") + (ord(c) - ord("a") + n) % 26))
else:
out += c
return out
out.append(c)

return "".join(out)


def main() -> None:
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