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<p>
The Fibonacci numbers are 1, 1, 2, 3, 5, 8, ..., where each
number is the sum of the two before it. These are numbered $F_1, F_2, \ldots$, and
\[
F_n = F_{n-1} + F_{n-2}.
\]
</p>
<p>
In the file <code>fibonacci.py</code> in the VS Code workspace, write a Python function <code>fib</code> that takes a number <code>n</code>
and returns the n<sup>th</sup> Fibonacci number, $F_n$.
</p>
<p>Your code snippet should define the following variables:</p>
<pl-external-grader-variables params-name="names_from_user">
<pl-variable name="fib" type="python function">Function to compute the $n^\text{th}$ Fibonacci number</pl-variable>
</pl-external-grader-variables>
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