Error: unsupported operand type(s) for +: 'int' and 'str'


#1

My code gives me the right answer but I still get the error message and I don't see what has caused it.

def get_average(numbers):
    average = float(sum(numbers)) / len(numbers)
    return average

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!
student_list = [lloyd, alice, tyler]
grade_list = {
    "homework": .1,
    "quizzes":.3,
    "tests":.6
}

for student in student_list:
    avg = 0.0
    for grade in grade_list:
      avg += grade_list[grade] * get_average(student[grade])
    print avg

#2

Please give the exercise link. Your code is working without error.

Thanks!