someone get Elon right now

Forking and running this no longer seems to work

That's a much better solution, thanks!
Never thought about handling uppercases that way, but since the key is so short it doesn't mess up the readability. Very cool.

thanks, and in doing this I found you can use dna (in its 3rd placement) instead of str

I have enever seen either of the functions 'translate' and 'maketrans'. Nice! Very succinct.