Part $2$: Write the do$\_$operation $($csv$,$ op$)$

function.

As described earlier, this function takes a csv string as input, along with an operation to perform on the

numbers in the string. The operation can be either to add them up $1,,$ to take their product

$,$ or to sort them $1$

Here are additional specifications for do$\_$operation :

The and 'prod' operations return a float. The 'sort' operation returns a NumPy array.

If omitted in the input, the operation should default to

$[]$: grader.check$("$q$2")$