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Resolves issue #12306 #12319

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Resolves issue #12306 #12319

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4879a46
Fix number of rotations `N` as 13 (Resolves TheAlgorithms#12306)
Y-Srivaishnavi Oct 29, 2024
5efef35
Add input validation and change function name to `apply_rot13`
Y-Srivaishnavi Oct 29, 2024
2bef9b9
Update documentation
Y-Srivaishnavi Oct 29, 2024
92d58b7
Add `.split
Y-Srivaishnavi Oct 29, 2024
3a98cda
Change `N` into lowercase
Y-Srivaishnavi Oct 29, 2024
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22 changes: 14 additions & 8 deletions ciphers/rot13.py
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Original file line number Diff line number Diff line change
@@ -1,14 +1,20 @@
def dencrypt(s: str, n: int = 13) -> str:
def apply_rot13(s: str) -> str:
"""
https://en.wikipedia.org/wiki/ROT13
Performs a special reversible case of the Caesar cipher.
Rotates a text by 13 letters.
Also see: https://en.wikipedia.org/wiki/ROT13

Example usage:
>>> msg = "My secret bank account number is 173-52946 so don't tell anyone!!"
>>> s = dencrypt(msg)
>>> s = apply_rot13(msg)
>>> s
"Zl frperg onax nppbhag ahzore vf 173-52946 fb qba'g gryy nalbar!!"
>>> dencrypt(s) == msg
>>> apply_rot13(s) == msg
True
"""
if not isinstance(s, str):
return "The input must be a string. Please try again."
n = 13
out = ""
for c in s:
if "A" <= c <= "Z":
Expand All @@ -21,13 +27,13 @@ def dencrypt(s: str, n: int = 13) -> str:


def main() -> None:
s0 = input("Enter message: ")
s0 = input("Enter message: ").strip()

s1 = dencrypt(s0, 13)
s1 = apply_rot13(s0)
print("Encryption:", s1)

s2 = dencrypt(s1, 13)
print("Decryption: ", s2)
s2 = apply_rot13(s1)
print("Decryption:", s2)


if __name__ == "__main__":
Expand Down