```
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)
avg = total / len(numbers)
return avg
def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
s = (.1 * homework) + (.3 * quizzes) + (.6 * tests)
return s
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):
results = []
for student in students:
results.append(get_average(student))
return average(results)
students = ["lloyd", "alice", "tyler"]`indent preformatted text by 4 spaces`
c_avg = get_class_average(students)
print c_avg
print get_letter_grade(c_avg)
```

# TypeError: string indices must be integers, not str

**datkold**#1

**datkold**#2

Figured it out.....

My list of students should not be:

`students = ["lloyd", "alice", "tyler"]`

I had to remove the quotations:

`students = [lloyd, alice, tyler]`

Yes I made the same mistake, the list of students should be the name of the associated dictionaries not the strings