Traceback (most recent call last): File "python", line 51, in <module> File "python", line 48, in get_class_average File "python", line 22, in average TypeError: unsupported operand type(s) for +: 'int' and 'str'

gistfile1.py

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 = float(sum(numbers))
    return total / float(len(numbers))

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'

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

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

my_class = [lloyd, alice, tyler]
get_class_average(my_class)