Part of the Whole


#1

I'm getting this error:

Oops, try again. get_class_average([alice]) resulted in an error: unsupported operand type(s) for *: 'NoneType' and 'float'

On this 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)
    total / len(numbers)
    
def get_average(student):
    homework = average(student['homework']) * .1
    quizzes = average(student['quizzes']) * .3
    tests = average(student['tests']) * .6
    score = homework + quizzes + tests
    return score
    
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'

students = [lloyd, alice, tyler]

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

I'd appreciate a push in the right direction


#2

Hi @sbussell1066,

Your average function has no return statement.

In the get_class_average function, you have this statement included in the for loop ...

        return average(results)

#3

Thank you. Working now.


#4