Exercise: ROT13

• rot13

• Implement ROT13:

• Create a script called rot13.py that given a string on the command line will print the ROT13 version of the string.

• It should work like this:

$ python rot13.py "Hello World!"
Uryyb Jbeyq!

$ python rot13.py "Uryyb Jbeyq!"
Hello World!