# Help on 8/9: error list indices must be integers, not str

#1

In exercise 8/9, Student Becomes the Teacher, I get an error message:

Oops, try again. get_class_average([alice]) resulted in an error: list indices must be integers, not str

I don't understand how the error relates to my code. Any ideas? thanks

``````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 /= len(numbers)

def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
return (homework * .1) + (quizzes * .3) + (tests * .6)

if score >= 90:
return "A"
elif score >= 80:
return "B"
elif score >= 70:
return "C"
elif score >= 60:
return "D"
else:
return "F"

students = [lloyd, alice, tyler]
def get_class_average(studnets):
results = []
for student in students:
results.append(get_average(studnets))
return average(results)``````

#2

``results.append(get_average(studnets))``

Change `studnets` to `student` as you are using `student` as your index in your loop:

``for student in students:``

and also change `students` to `studnets` in the for loop statement as that is what you're using as a parameter hence what you are referring your index, `student`, to.

#3

thanks datfatcat, ive always thought i was dyslexic...now its confirmed

#4

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