Error Message:

Traceback (most recent call last):

File "python", line 49, in 'module'

File "python", line 45, in get_class_average

File "python", line 26, in get_average

TypeError: 'type' object has no attribute '**getitem**'

Code:

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]

}

def average(numbers):

total = sum(numbers)

total = float(total)

total = total/len(numbers)

return total

def get_average(student):

homework = average(student['homework'])

quizzes = average(student['quizzes'])

tests = average(student['tests'])

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

def get_letter_grade(score):

if score >= 90:

return 'A'

if score >= 80:

return 'B'

if score >= 70:

return 'C'

if score >= 60:

return 'D'

else:

return 'F'

get_letter_grade(lloyd)

def get_class_average(students):

results = []

for student in students:

get_average(students)

results.append(get_average(students))

return average(results)

students = [lloyd , alice , tyler]

print (get_class_average(students))

letter = get_letter_grade (get_class_average(students))

print (letter)

What do I need to fix, and why?