Grade An Exam (program that grades multiple-choice tests)

def main():
    # Students' answer to the questions
    answers = [
        ['A', 'B', 'A', 'C', 'C', 'D', 'E', 'E', 'A', 'D'],
        ['D', 'B', 'A', 'B', 'C', 'A', 'E', 'E', 'A', 'D'],
        ['E', 'D', 'D', 'A', 'C', 'B', 'E', 'E', 'A', 'D'],
        ['C', 'B', 'A', 'E', 'D', 'C', 'E', 'E', 'A', 'D'],
        ['A', 'B', 'D', 'C', 'C', 'D', 'E', 'E', 'A', 'D'],
        ['B', 'B', 'E', 'C', 'C', 'D', 'E', 'E', 'A', 'D'],
        ['B', 'B', 'A', 'C', 'C', 'D', 'E', 'E', 'A', 'D'],
        ['E', 'B', 'E', 'C', 'C', 'D', 'E', 'E', 'A', 'D']]
    
    # key to the questions
    keys = ['D', 'B', 'D', 'C', 'C', 'D', 'A', 'E', 'A', 'D']

    # Grade all answers
    for i in range(len(answers)):
        # Grade one student
        correctCount = 0
        for j in range(len(answers[i])):
            if answers[i][j] == keys[j]:
                correctCount += 1

        print("Student", i , "'s correct count is", correctCount)


main() # Call tha main function