Question

对于以下代码的输出，我得到一个无，我不知道为什么会这样？有人可以解释一下它为什么以及如何修复它？这是代码，

Please Enter a Number that is not prime: None

这是输出;

while(temp!=NULL)
{
    N=temp->next->data;
...

Answer 1

input函数已打印输入消息，因此您不需要打印功能。它显示None，因为print函数返回None。变化

int(input(print("Please Enter a Number that is positive: ")))

到

int(input("Please Enter a Number that is positive: "))

也可以为其他输入执行此操作。

如果您想在新行上输入输入，您也可以

int(input("Please Enter a Number that is positive: \n"))

Answer 2

请删除打印声明。

def randomQuestions():
            q1 = 1
            q2 = 2
            for i in range(1):
                if random.randint(1,2)==1:
                    a1=int(input("Please Enter a Number that is not prime: "))

                    if a1>1:
                        for i in range (2,a1):
                            if (a1%i)==0:
                                print("Correct",a1,"is Not a prime number")
                                break
                        else:
                            print("Incorrect",a1,"is a Prime number")
                    else:
                        print("Incorrect",a1,"is a Prime number")
                else:
                    a2=int(input("Please Enter a Number that is positive: "))

                    if a2>0:
                        print("Correct",a2,"is Positive")
                    elif a2==0:
                        print(a2,'Is neither Positive Nor Negative')
                    else:
                        print('Incorrect',a2,'is Not Positive')

Answer 3

无需使用打印包装器进行输入。

https://docs.python.org/3/library/functions.html#input

此外，在继续之前进行NoneType检查可能不是一个坏主意，但下面的代码应该让你工作。

import random


def randomQuestions():
    q1 = 1
    q2 = 2

    for i in range(1):
        if random.randint(1,2) == 1:
            a1 = int(input("Please Enter a Number that is not prime: "))
            if a1 > 1:
                for i in range (2, a1):
                    if (a1 % i) == 0:
                        print("Correct", a1, "is Not a prime number")
                        break
                else:
                    print("Incorrect", a1, "is a Prime number")
            else:
                print("Incorrect", a1, "is a Prime number")
        else:
            a2 = int(input("Please Enter a Number that is positive: "))
            if a2 > 0:
                print("Correct", a2, "is Positive")
            elif a2 == 0:
                print(a2, 'Is neither Positive Nor Negative')
            else:
                print('Incorrect', a2, 'is Not Positive')

if __name__ == '__main__':
    randomQuestions()

为什么它在输出中显示无

3 个答案: