Part of a whole: Average is wrong?


#1


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

Oops, try again. get_class_average([alice]) returned 83.8666666667 instead of 91.15 as expected

The calculated class average is correct but the system wants only Alice's average.
I'm not sure why...


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 = total / len(numbers)
    return total
def get_average(student):
    homework = average(student["homework"])
    quizzes = average(student["quizzes"])
    tests = average(student["tests"])
    weighted_average = 0.1 * homework + \
    0.3 * quizzes + \
    0.6 * tests
    return weighted_average
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_average(lloyd)
print get_average(alice)
print get_average(tyler)

def get_class_average(students):
    students = [lloyd, alice, tyler]
    results = []
    for student in students:
        results.append(get_average(student))
    return average(results)
print get_class_average(alice)

I have no idea what I'm doing wrong

Thanks!


#2

Hi @hanahm92,

Placing this assignment ...

    students = [lloyd, alice, tyler]

... within the get_class_average function overwrites its students parameter, defeating the purpose of that parameter.


#3

Thanks! If I get rid of the list or put it external of the get_class_average function, I get a traceback error.

Traceback (most recent call last):
File "python", line 57, in
File "python", line 55, in get_class_average
File "python", line 27, in get_average
TypeError: string indices must be integers, not str


#4

You have this statement ...

print get_class_average(alice)

The get_class_average function is designed to handle a list as an argument. Therefore, you should place square brackets around alice within the parentheses in that statement.


#5

Oh ok, the brackets and the removal of the students list got it to work. Thanks so much!


#6