Part of the Whole


#1


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

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


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)
    average = total / len(numbers)
    return average
    
def get_average(student):
     homework = average(student["homework"])
     quizzes = average(student["quizzes"])
     tests = average(student["tests"])
     homework*0.1 + quizzes*0.3 + tests*0.6

def get_letter_grade(score) :
    if score >= 90:
        return "A"
    elif score >= 80 and score < 90:
        return "B"
    elif score >= 70and score < 80:
        return "C"
    elif score >= 60and score < 70:
        return "D"
    else:
        return "F"

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


#2

your get_average function doesn't return anything (it should) so the default None is returned, which is then appended to your results list. When you then call average() on a list containin None, you get an error


#3

oh yes! thanks again


#4

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