Codecademy 学生变老师

Question

我在Codecademy的一个课程中遇到了问题。有人能帮我吗？

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 = 0
    total = sum(numbers)
    result = float(total) / len(numbers)
    return result

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

student = [lloyd, alice, tyler]

students = [lloyd, alice, tyler]

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

“哎呀，再试一次。你的get_class_average函数是不是只接受一个输入（一个学生的列表）？你的代码出现了‘列表索引必须是整数，而不是字符串’的错误。”

Answer 1

student 是一个全局的列表。你在循环里把它传给 get_average() 的原因不太清楚（或者说它为什么存在也不太明白）。你可能是想用 get_average(each)。