Code works for "How is Everybody Doing" but results are weird


#1



https://www.codecademy.com/courses/python-beginner-en-qzsCL/1/5?curriculum_id=4f89dab3d788890003000096


So it looks like I managed to clear the lesson but the results came back weird. Can someone explain why this works:

students = [lloyd, alice, tyler]

print get_class_average(students)
print get_letter_grade(get_class_average(students))

but this doesn't:

print get_class_average([lloyd, alice, tyler])
print get_letter_grade(get_class_average([lloyd, alice, tyler]))


I would also like to ask why the working code returns two letter grades and one float like so:
B
83.8666666667
B


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)
    return total / len(numbers)
    
    #emtpy space to look pretty
def get_average(student):
    homework = average(student["homework"])
    quizzes = average(student["quizzes"])
    tests = average(student["tests"])
    
    homework = 0.10 * average(student["homework"])
    quizzes = 0.30 * average(student["quizzes"])
    tests = 0.60 * average(student["tests"])
    return homework + quizzes + 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(get_average(lloyd))

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

print get_class_average(students)

print get_letter_grade(get_class_average(students))


#2

If these are indeed YOUR results, then we should not need to explain them. You should be explaining them to US.


#5

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