All assignments done

Please, take a look at them.  Any recommendations for improvement?
interesting approach.

Check out the stri.translate() method -- it does kind of the same thing, but much faster.

or you could use the math -- ord(letter) will give you the numerical value, which you can add 13 to, then use chr() to make it a letter.

but this is fine, too -- more than one way to write a function.