How is Everyone Doing


#1

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

Console:

83.8666666667
A
None

Error message:
"Oops, try again. Did you remember to print the letter grade for the class's average?"

I'm missing why an 83.86 got an A.
and I assume that is the entirety of the problem

here's the code. Any thoughts?

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]
}
students=[lloyd, alice, tyler]
def average(numbers):
    total=sum(numbers)
    total=float(total)
    return total/len(numbers)
def get_average(student):
    homework=average(student["homework"])
    quizzes=average(student["quizzes"])
    tests=average(student["tests"])
    return .1*homework+.3*quizzes+.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 score
def get_class_average(students):
    results=[]
    for student in students:
        results.append(get_average(student))
    return average(results)
print get_class_average(students)
print get_letter_grade(get_class_average)

#2

Hi @poitrasm,

The following statement is what displayed the "A" grade ...

print get_letter_grade(get_class_average)

You passed a reference to the get_class_average function to the get_letter_grade function rather than passing the result of calling the get_class_average function to the get_letter_grade function. Therefore, this if block header within the get_letter_grade function ...

if score>=90:

... compared the get_class_average function directly to 90.0 instead of comparing a number grade to 90.0. The result of the comparison was True.

A comparison between a number and a non-numerical object will often produce an unwanted result.

The aforementioned print statement should be ...

print get_letter_grade(get_class_average(students))

#3

Right! Thanks.
I just missed that get_class_average wasnt using a reference.
I must have read it 20 times and never saw that the "()" was missing. Nested functions like that can fatigue the brain.
thanks again


#4