Part of the Whole - Tuple Error?


#1


Hi all,

When I run this code, I'm getting the error message:

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

Not sure why, since all the exercises before ran perfectly and I only added the bottom parts...I'm confused about what under Alice would make it a tuple rather than a list in the first place. Any advice? :slight_smile:

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)

def get_average(student):
    homework = average(student["homework"])
    quizzes = average(student["quizzes"])
    tests = average(student["tests"])
    return 0.1 * homework + 0.3 * quizzes \
    + 0.6 * 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 get_letter_grade(get_average(lloyd))

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


#2

The problem may lie with the comma after the results declaration.


#3

that's it!! Thank you


#4

You're welcome. Happy coding!


#5

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