Traceback (most recent call last):

File "python", line 56, in

File "python", line 52, in get_class_average

File "python", line 28, in get_average

TypeError: string indices must be integers, not str

Hi guys i really need some help. So prior to reaching this stage, i received no error messages regarding line 28 [homework = average(student["homework"])*0.1] but now im receiving all these error messages. I'm trying to print out the result of calling my get_class_average function with students as my input as well as print the class' average for the get_letter_grade function but I've messed up somewhere and im completely new to coding so I'm not sure what to do...any help?

```
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):
total = sum(numbers)
total = float(total)
new_total = total / len(numbers)
return new_total
def get_average(student):
homework = average(student["homework"])*0.1
quizzes = average(student["quizzes"])*0.3
tests = average(student["tests"])*0.6
total = homework + quizzes + tests
return total
def get_letter_grade(score):
if score == 90 or score > 90:
return "A"
elif score ==80 or score >80:
return "B"
elif score == 70 or score > 70:
return "C"
elif score == 60 or score > 60:
return "D"
else:
return "F"
testing = get_letter_grade(lloyd)
print testing
students = [lloyd, alice, tyler]
def get_class_average(students):
results = []
for student in students:
total = get_average(student)
results.append(total)
return average(results)
students = [lloyd, alice, tyler]
print get_class_average(students)
print get_class_average(get_letter_grade(students))
```