XOR of three values

Question

What is the simplest way to do a three-way exclusive OR?

In other words, I have three values, and I want a statement that evaluates to true IFF only one of

Answer 1

Better yet on Python:

result = (1 if a else 0)+(1 if b else 0)+(1 if c else 0) == 1

This can be used also on if statements!

It saved my day for CLI mutually exclusive arguments through Click (everyone hates click)