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 :slight_smile:

https://www.codecademy.com/courses/python-beginner-en-qzsCL/1/4?curriculum_id=4f89dab3d788890003000096


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]
}

# Add your function below!
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"])
def get_letter_grade(score):
    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

Hi @gigaplayer94132 ,

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! :slight_smile:
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 :slight_smile:


#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]
}

Add your function below!

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)

def get_letter_grade(score):
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.:confused: 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? :cold_sweat:... 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

def get_letter_grade(score):
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))

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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