Question

以下是用于打印和计算加权考试成绩的代码：

def exam(weight,score_earned,score_shift): 
    if  (score_shift==1):
        shift_amount=input("What was the shift amount?")
        score_earned=int(shift_amount+score_earned)
    if (score_earned >100):
        score_earned=100
    print("Total points = "+str(score_earned)+str("/100"))
    weighted_score=int((score_earned/100.0)*weight)
    print("Your weighted score = "+str(weighted_score)+"/"+str(weight))
    return weighted_score
def exam_1():
    print("Midterm 1:")
    exam(input("Weight 0-100?"),input("Score earned?"),input("Were scores shifted (1= yes 2=no)? "))

然后我添加了另一个具有不同名称的类似函数，所以...

def exam_2():
    print("\nMidterm 2:")
    exam(input("Weight 0-100? "),input("Score earned? "),input("Were scores shifted (1= yes 2=no)? "))

之后，我将这两个加在一起，这就是我的问题所在。

overall_percentage =int(exam_1() +exam_2())

我希望代码使用返回的weighted_score为每个分数添加加权分数。虽然，当我运行代码时，它给了我这个错误：

TypeError: unsupported operand type(s) for +: 'NoneType' and 'NoneType'

我该如何解决？

这也是示例输出-一切都正常，除了total_percentage之外，这使我认为return语句出了点问题：

Midterm 1:
Weight 0-100? 50
Score earned? 88
Were scores shifted (1= yes 2=no)? 2
Total points = 88/100
Your weighted score = 44/50

Midterm 2:
Weight 0-100? 50
Score earned? 88
Were scores shifted (1= yes 2=no)? 2
Total points = 88/100
Your weighted score = 44/50

Answer 1

您的函数rabbitmqctl set_disk_free_limit mem_relative <fraction>和img.button:hover ~ p.text { color: rgb(88, 202, 230); } p { font-weight: 300; transition: color 1s ease; }不返回任何值（= <img class='button' src='//placehold.it/100?text=avatar' /> <p class='text'>Profile</p>）。

这就是exam_1产生exam_2并引发您所看到的异常的原因：

TypeError：+不支持的操作数类型：“ NoneType”和“ NoneType”

您可以轻松解决该问题：

None

和

exam_1() + exam_2()

Python 2.7返回值和添加函数

1 个答案: