8. part of a whole


#1

Im not sure whats wrong with it but i keep getting this error message;

Oops, try again. get_class_average([alice]) resulted in an error: 'dict' object has no attribute 'append'

here 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]
}

def average(numbers):
    total = sum(numbers)
    total = float(total) / float(len(numbers))
    return total
def get_average(student):
    homework = average(student["homework"])
    quizzes = average(student["quizzes"])
    tests = average(student["tests"])
    return sum((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"
print get_letter_grade(get_average(lloyd))
def get_class_average(students):
    students = [lloyd, alice, tyler]    
    results = {}
    for student in students:
        results.append(get_average(student))
    return average(results)

#2

Have you read that error message? It says quite a lot!


#3

Dictionaries can be dicts sometimes, haha I make myself laugh sometimes.


#4

Students list should be before than function get_class_average(students)


#5

That makes no difference either way.


#6

the problem is here: results = {} which is an empty dictionary, not an empty list
should be: results = []