mathdatech/Python
1
0
Fork 0
mirror of https://github.com/TheAlgorithms/Python.git synced 2025-03-30 18:36:43 +00:00
Code Issues Packages Projects Releases Wiki Activity

Add input validation and change function name to apply_rot13

Browse Source
This commit is contained in:
Srivaishnavi Yaddanapudi 2024-10-29 17:04:58 +05:30 committed by GitHub
parent 4879a46be1
commit 5efef35d8d
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 11 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
ciphers/rot13.py
View File

@ -1,14 +1,19 @@
def dencrypt(s: str) -> str: def apply_rot13(s: str) -> str:
""" """
https://en.wikipedia.org/wiki/ROT13 Performs a special case of the Caesar cipher.
Rotates the plaintext 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 N = 13
out = "" out = ""
for c in s: for c in s:
@ -24,10 +29,10 @@ def dencrypt(s: str) -> str:
def main() -> None: def main() -> None:
s0 = input("Enter message: ") s0 = input("Enter message: ")
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)