Python 7/9 Problems!Help!


#1



Error message: Oops, try again. grades_variance([3, 7, 8, 1, 3]) returned 0.392 instead of the expected: 7.04
Outcome in the terminal: 29.4812243969
None

I really do not see anything with the code below. Any help would be appreciated.


grades = [100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5]

def print_grades(grades):
    for grade in grades:
        print grade

def grades_sum(grades):
    total = 0
    for grade in grades: 
        total += grade
    return total
    
def grades_average(grades):
    sum_of_grades = grades_sum(grades)
    average = sum_of_grades / float(len(grades))
    return average

def grades_variance(scores):
    average = grades_average(scores)
    variance = 0
    for score in scores:
        squared_diff = (average - score) ** 2
        variance = variance + squared_diff
        return_function =  variance/len(scores)
        return return_function
print grades_variance(grades)


#2

Hi
the return in the function grades_variance is indented too much. It should be at the same level as the for. For the moment, the loop is executed only for the first score and then is exited.