Now that we have a function to print the grades, let’s create another function to compute the sum of all of the test grades.

This will be super-helpful when we need to compute the average score.

I know what you’re thinking, “let’s just use the built-in sum function!” The built-in function would work beautifully, but it would be too easy.

Computing the sum manually involves computing a rolling sum. As you loop through the list, add the current grade to a variable that keeps track of the total, let’s call that variable total.



On line 3, define a function, grades_sum, that does the following:

  • Takes in a list of scores, scores
  • Computes the sum of the scores
  • Returns the computed sum.

Call the newly created grades_sum function with the list of grades and print the result.

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