Question

我正在尝试使用以下错误对codeacademy进行练习：

＆＃34;哎呀，再试一次。 get_class_average（[alice]）导致错误：全局名称＆＃39; student_average＆＃39;未定义＆＃34;

代码如下：

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)
    alpha = total/len(numbers)
    return alpha

def get_average(student):
    homework = average(student['homework'])
    quizzes = average(student['quizzes'])
    tests = average(student['tests'])
    student_average = homework*10/100 + quizzes*30/100 + tests*60/100
    return student_average

def get_letter_grade(score):
    if score >= 90:
        return "A"
    elif score < 90 and score >= 80:
        return "B"
    elif score < 80 and score >= 70:
        return "C"
    elif score < 70 and score >= 60:
        return "D"
    else:
        return "F"        

print get_letter_grade(lloyd)

def get_class_average(students):
    results = []
    alpha2 = 0
    for item in students:
        alpha2 = student_average(student)
        results.append(alpha2)
    return alpha2 / len(students)

print get_class_average([lloyd, alice, tyler])

Answer 1

您在get_average(student)循环中错误地调用了函数for。不是通过get_average(student)调用它，而是使用student_average(student)。

由于student_average 实际上是变量而未在函数 get_average()之外定义，因此会导致明显的错误，因为< strong> 仅在定义的函数内可见 ：

这个电话：

for item in students:
    alpha2 = student_average(student)

应改为：

for item in students:
    alpha2 = get_average(student)

全球名称＆＃39; student_average＆＃39;没有定义

1 个答案: