# Student Becomes the Teacher, Part of the whole

#1

I am getting the following error message:

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

Apologies in advance if I have missed something obvious in the following 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 = float(sum(numbers))
a = total / len(numbers)
return a

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

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(students):
for student in students:
results=[]
a = get_average(students)
result.append(a)
return average(results)``````

All help greatly appreciated.

#2

``````def get_class_average(students):
for student in students:
results=[]
a = get_average(students)
result.append(a)
return average(results)
print get_class_average([lloyd])``````

then we can pinpoint the error with help of the interpreter message.

the problem is here:

`` a = get_average(students)``

students is a list, `get_average` is only designed to calculate the average of a single `student` (this is why we have a loop)

#3

Thanks for your prompt response, I think my issue was with indentation?

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

#4

given indention determines nesting/hierarchy, yes your problem was indention but seems you fixed it, well done

#5

Apparently, your problem was not with indentation,but the parameter you sent in "get_avarage()".Earlier you sent the whole list "students" instead of "student" that you declared as a variable in the for loop.

#6

yes, he knows. He resolved the problem

#7