Str not integer, but why?


#1


https://www.codecademy.com/en/courses/python-beginner-en-qzsCL/1/4

I'm getting the error message, "get_class_average([alice]) resulted in an error: list indices must be integers, not str"

It should be giving me the average of the class (or average of the averages of the students), I'm not even sure that [alice] is the right thing to have been the input, I'm just assuming that the course has it right and I'm wildly wrong.


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)
    total = total / len(numbers)
    return total

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"

def get_class_average(student):
    print get_letter_grade(get_average(student))
    results = {}
    get_average(student)
    return average(results)


#2

run the same thing in your code, you'll most likely get a matching error message, read it, the line number says where it happens, add print statement(s) to look closer at the values that you are using at that line.


#3

thanks for the help! it worked and I've found my mistake.