This is what I have:

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]

}

def average(numbers):

total = sum(numbers)

total = float(total)

total = total / len(numbers)

return total

def get_average(student):

homework = float(average(student["homework"])) * 0.1

quizzes = float(average(student["quizzes"])) * 0.3

tests = float(average(student["tests"])) * 0.6

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_average(lloyd)

def get_class_average(students):

results = []

for student in students:

get_average(student);

results.append()

return average(results)

the error is: Oops, try again. get_class_average([alice]) resulted in an error: append() takes exactly one argument (0 given)!!

What do I do?