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Merge 3a98cdab6e into e3bd7721c8

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Srivaishnavi Yaddanapudi 2024-11-17 17:51:30 +05:30 committed by GitHub
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1 changed files with 14 additions and 8 deletions
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22
ciphers/rot13.py
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@ -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!!" >>> msg = "My secret bank account number is 173-52946 so don't tell anyone!!"
>>> s = dencrypt(msg) >>> s = apply_rot13(msg)
>>> s >>> s
"Zl frperg onax nppbhag ahzore vf 173-52946 fb qba'g gryy nalbar!!" "Zl frperg onax nppbhag ahzore vf 173-52946 fb qba'g gryy nalbar!!"
>>> dencrypt(s) == msg >>> apply_rot13(s) == msg
True True
""" """
if not isinstance(s, str):
return "The input must be a string. Please try again."
n = 13
out = "" out = ""
for c in s: for c in s:
if "A" <= c <= "Z": if "A" <= c <= "Z":
@ -21,13 +27,13 @@ def dencrypt(s: str, n: int = 13) -> str:
def main() -> None: def main() -> None:
s0 = input("Enter message: ") s0 = input("Enter message: ").strip()
s1 = dencrypt(s0, 13) s1 = apply_rot13(s0)
print("Encryption:", s1) print("Encryption:", s1)
s2 = dencrypt(s1, 13) s2 = apply_rot13(s1)
print("Decryption: ", s2) print("Decryption:", s2)
if __name__ == "__main__": if __name__ == "__main__":