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]

def average(numbers):

total = sum(numbers)

total = float(total)

return total/len(numbers)

def get_average(student):

homework = average(students[“homework”])

quizzes = average(students[“quizzes”])

tests = average(students[“tests”])

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

def get_letter_grade(score):

if score >= 90:

return "A"

elif score >= 80:

return "B"

elif score >= 70:

return "C"

elif score >= 60:

return "D"

else :

return “F”

print get_letter_grade(get_average(lloyd))

def get_class_average(students):

for student in students:

results = get_average(student)

results.append(student)

return average(results)

print get_class_average(students)

print get_letter_grade(get_average)

it appears this error (I know that it isn’t about this lesson, but I lost all my progress and I had to rewrite it):

Traceback (most recent call last):

File “python”, line 47, in

File “python”, line 30, in get_average

TypeError: list indices must be integers, not str

The line 47 is «print get_letter_grade(get_average(lloyd))»

The line 30 is «homework = average(students[“homework”])»

I can’t find the error. Can anyone help me please?