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

#1

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]
}

students = [lloyd, alice, tyler]

def average(numbers):
total = sum(numbers)
total = float(total)

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

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)) # Daje wynik z sredniej lloyda

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

the error message says:

"get_class_average([alice]) resulted in an error: list indices must be integers, not str"

#2

also if results.append(get_average(students)) is changed to student it says a message:
"get_class_average([alice, lloyd]) returned 91.15 instead of 85.85 as expected"

EDIT: problem solved I just had to indent return average(results)

#3

def get_class_average(students):
results = []
for student in students:

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

#4

see below for correct ness

#5

one more