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]
}

# Add your function below!
def average(numbers):
    total = sum(numbers)
    total = float(total) / len(numbers)
    return total
    
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 >= 90.0:
        return "A"
    elif score >= 80.0:
        return "B"
    elif score >= 70.0:
        return "C"
    elif score >= 60.0:
        return "D"
    else:
        return "F"

print get_letter_grade(get_average(lloyd))

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)
print get_letter_grade(get_average(students))

Thanks for any help! :slight_smile:


#2

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

Also instead of

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! :slight_smile:


#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

This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.