Time to stretch your wings a bit. I'm going to give you a description of a single function in English. Your job is to copy the description into a new text file, and then add tests that describe all the requirements in a way that the computer can understand and check.
Try to make the doctests so that they're not just for the computer. Good doctests tend to clarify things for human readers as well. By and large, this means that you present them to human readers as examples interspersed with the text.
Without further ado, here is the English description:
The fib(N) function takes a single integer as its only parameter N. If N is 0 or 1, the function returns 1. If N is less than 0, the function raises a ValueError. Otherwise, the function returns the sum of fib(N – 1) and fib(N – 2). The returned value will never be less than 1. A naïve implementation of this function would get very slow as N increased.
I'll give you a hint and point out that the last sentence about...