# 9. How is Everybody Doing?

#1
1. How is Everybody Doing?

Hi, I have a problem with this part.
I get a pass on my code: "Congratulations, you've finished this course!", however i get errors in my output:

B
83.8666666667
Traceback (most recent call last):
File "python", line 55, in
File "python", line 27, in get_average
TypeError: list indices must be integers, not str

This is my code:

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

def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])

return 0.1 * average(student["homework"]) + 0.3 * average(student["quizzes"]) + 0.6 * average(student["tests"])

if score >= 90.0:
return "A"
elif score >= 80.0:
return "B"
elif score >= 70.0:
return "C"
elif score >= 60.0:
return "D"
else:
return "F"

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

print get_class_average(students)

Thanks for any help!

#2

Change
`print (get_letter_grade(get_average(students)))`
to
`print (get_letter_grade(get_class_average(students)))`

` return 0.1 * average(student["homework"]) + 0.3 * average(student["quizzes"]) + 0.6 * average(student["tests"])`
You can use use your variables

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

#3

Thank you so much!

#4

do you also understand why this changes work? djverynice told you what to change, but not why

#5

Hello, stetim94 could you explain these for me please. what is results = [] there for, what is results.append(get_average(student)) mean ,and why print get_letter_grade(get_average(students))

#6

what do you think it is for?

``results.append(get_average(student))``

this will append the weighted average grade of each student to the result list

``get_letter_grade(get_average(students))``

i wouldn't do this, get_average is designed to calculate the weighted average grades for one student, not multiply students, use get_class_average instead

#7

Thank you for the free code

#8

in order to use the list later on?
thank you ！

#9

lists are ordered, yes

#10

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