Unsupported operand type for 8/9?


#1

Here is my code, was approved until I reached 8/9:

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]
}

students = [lloyd, alice, tyler]

Add your function below!

def average(numbers):
total = sum(numbers)
total = float(total)
avg = total/len(numbers)
print avg

def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
print (0.1 * homework) + (0.3 * quizzes) + (0.6 * tests)

def get_letter_grade(score):
if score >= 90.0:
return "A"
elif score >= 80.0:
return "B"
elif score >= 70.0:
return "C"
elif score >= 60.0:
return "D"
else:
return "F"

def get_class_average(students):
results = []
for student in students:
results.append(get_average(student))
return average(results)

But for some reason, I get this error message?

Oops, try again.
get_class_average([alice]) resulted in an error: unsupported operand type(s) for *: 'float' and 'NoneType'

#2

Your function for avg is returning none.


#3

Thanks, realized my def average(numbers) was not setup correctly (interestingly, in exercise 5 when I made that, Codeacademy said it was correct...). Thanks for pointing that out!


#4

How did you fix your code? I have the same problem.