8. part of a whole


#1

Similar issue. But not sure what's wrong with 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 = float(sum(numbers)) / len(numbers)
    return total

students=[lloyd,alice,tyler]

def get_average(student):
    homework = average(student["homework"])
    quizzes = average(student["quizzes"])
    tests = average(student["tests"])
    print 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(lloyd)

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

the error is: get_class_average([alice]) resulted in an error: unsupported operand type(s) for +: 'int' and 'NoneType'

thanks


8.Part of the Whole
#2

you have a very different issues. in weight and see you build the get_average function.

from this exercise some of the instructions:

Multiply the 3 averages by their weights and return the sum of those three. Homework is 10%, quizzes are 30% and tests are 60%.

there is one very important word in this sentence: return. you don't return, you print


#3

that worked. thanks!


#4