Error:

4.0

C

Traceback (most recent call last):

File "python", line 58, in

File "python", line 55, in get_class_average

File "python", line 32, in get_average

TypeError: string indices must be integers, not str

```
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)
return(total/len(numbers))
numbers=[2,4,6]
print (average(numbers))
student=[lloyd,alice,tyler]
def get_average(student):
for i in student:
a=average(student["homework"])
b=average(student["quizzes"])
c=average(student["tests"])
total=(a*0.10)+(b*0.30)+ (c*0.60)
return(total)
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(tyler))
students = ["lloyd","alice","tyler"]
def get_class_average(students):
results=[]
for student in students:
a=get_average(student)
results.append(a)
return average(results)
b= get_class_average(students)
print b
print get_letter_grade(b)
```