Part of the Whole : 'tuple' object has no attribute 'append'


#1

The error am getting:

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

My code is given below:

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, lloyd, tyler]

# 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 and score < 90 :
        return "B"
    elif score >= 70 and score < 80 :
        return "C"
    elif score >= 60 and score < 70 :
        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)

Can somebody illuminate me on why am getting this error.

Thanks,Abhiram.


#2

Remove the stray comma from this line so it does not look like a tuple object.


#3

here:

results = [] ,

why is there a comma in this line? This causes that results is a tuple (an immutable list), rather then a list


#4

Thank you very much, was stuck at this from past couple of days.


#5

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