Hi everyone. I have a question about the below exercise.

Here's my code for this exercise. I've completed this exercise, so I know what you have to do, but I don't know why the below doesn't work. As you can see, I've added 'print' within the functions below.

lloyd = {

"name": "Lloyd",

"homework": [90.0, 97.0, 75.0, 92.0],

"quizzes": [88.0, 40.0, 94.0],

"tests": [75.0, 90.0]

}

alice = {

"name": "Alice",

"homework": [100.0, 92.0, 98.0, 100.0],

"quizzes": [82.0, 83.0, 91.0],

"tests": [89.0, 97.0]

}

tyler = {

"name": "Tyler",

"homework": [0.0, 87.0, 75.0, 22.0],

"quizzes": [0.0, 75.0, 78.0],

"tests": [100.0, 100.0]

}

# Add your function below!

def average(numbers):

k = sum(numbers)

total = float(k) / len(numbers)

return total

print total

def get_average(student):

homework = average(student["homework"])

quizzes = average(student["quizzes"])

tests = average(student["tests"])

return 0.3 * quizzes + 0.1 * homework + 0.6 * tests

def get_letter_grade(score):

if score >= 90:

return 'A'

print 'A'

elif 80 <= score < 90:

return 'B'

print 'B'

if 70 <= score < 80:

return 'C'

print 'C'

elif 60 <= score < 70:

return 'D'

print 'D'

else:

return "F"

print 'F'

get_letter_grade(get_average(lloyd))

students = [lloyd, alice, tyler]

def get_class_average(students):

results = []

for student in students:

results.append(get_average(student))

return average(results)

print average(results)

get_class_average(students)

get_letter_grade(get_class_average(students))

Can anyone help me understand why this doesn't work? I know that you have to end with:

print get_class_average(students)

print get_letter_grade(get_class_average(students))

But why is adding the 'print' command into the functions themselves insufficient?

Thanks in advance for any help.