# 8. Part of the Whole

#1

I cannot find the location of my error, saying that: "get_class_average([alice]) should return a number".
Any help is appreciated! :slight_smile

Oops, try again. get_class_average([alice]) should return a number

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

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

#2

HI this part

``````    for student in students:
return results.append(get_average(student))
return average(results)``````

this line

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

just remove return

#3

Thanks a ton @wizmarco !

#4

It says for me that the return is outside the function.def get_class_average(students):
results = []
for student in students:
results.append(get_average(student))
return average(results)

#5

All you have to do is indent the return line:

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

I hope this helps!

#6

Hey wizmarco - thanks a lot for your help!
But I don't understand why removing return makes it work...

#8

its the oposite,

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

#9

because return returns the value of the function for use outside of that function

#11

I have no idea where I messed up. Everything looks fine and when I run it the error says it returns 83.666667 instead of 91.15. Please help. Sorry about how this is posted i just copy and pasted my code onto here.

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)
return float(total) / len(numbers)

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

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

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

#12

for student in students:
results.append(get_average(student)) #Add a space in the beginning of the line
return average(results)

#13

Hi, guys! Please, help. I can't find where I messed it up. The error message says: "get_class_average([alice, lloyd]) returned 91.15 instead of 85.85 as expected "
What does it mean? Something to do with Tyler? ... I don't know, but hope you do. Here is my code ...

#14

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)
mean = total / len(numbers)
return mean

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"

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

#15

change

``````for student in students:
results.append(get_average(student))
return average(results)``````

to this:

``````for student in students:
results.append(get_average(student))
return average(results)``````

bring `return` line one indent back along `for` line indent.

#16

a function terminates after "return" is read. When you had two returns, the function simply quit after reading the first return.

#18

oh, that makes it clear... thx!

#19

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