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Add input validation and change function name to apply_rot13

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Srivaishnavi Yaddanapudi 2024-10-29 17:04:58 +05:30 committed by GitHub
parent 4879a46be1
commit 5efef35d8d
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1 changed files with 11 additions and 6 deletions
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17
ciphers/rot13.py
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@ -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!!"
>>> 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:
@ -24,10 +29,10 @@ def dencrypt(s: str) -> str:
def main() -> None:
s0 = input("Enter message: ")
s1 = dencrypt(s0, 13)
s1 = apply_rot13(s0)
print("Encryption:", s1)
s2 = dencrypt(s1, 13)
s2 = apply_rot13(s1)
print("Decryption: ", s2)