HW$3\mathrm{.}17.$ Print a countdown from $n$ to $1$

Define a function below, print countdown, which takes a single integer argument $($i$.$e$.$ begin$).$ Complete the function so that it prints the numbers starting at begin down to $1,$ each on a separate line.

There are two recommended approaches for this: $(1)$ use a for loop over a range statement with a negative step value, or $(2)$ use a while loop, printing and decrementing the value each time.