How to ask for input again after taking input and receiving output in python

Question

x = int(input())  
for i in range(2,x):    
     if(x % i ==0):      
        print("not Prime")  
        break  
else :  
    print("Prime")

In this example, I am asking the user to input a value for x. So let's say the user inputs 6 since it is not a prime number, it will say "not Prime." However, I want to ask the user to input another value to check.

x = int(input())  

for i in range(2,x):  
    if(x % i ==0):      
        print("not Prime")  
        break  
else :  
    print("Prime")  

x = int(input())

Doing this does not work. so what can I do to ask the user to input another value? without having to run it again?

Jeff Huang · Accepted Answer · 2020-03-08 06:27:45Z

2

In your second code snippet you are not doing anything after the second input. Perhaps you are forgetting to call the forloop again? This works for me to do what you described. Does the following work for you? Of course using a function is more elegant for this.

x = int(input())  

for i in range(2,x):  
    if(x % i ==0):      
        print("not Prime")  
        break  
else :  
    print("Prime")  

x = int(input())

for i in range(2,x):
    if(x % i ==0):
        print("not Prime")
        break
else :  
    print("Prime")

Here is how it runs in my pycharm

edited Mar 8, 2020 at 6:27

answered Mar 8, 2020 at 6:16

Jeff Huang

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10 Comments

Sunny55 Over a year ago

the second snippet is simply just a failed attempt. I was saying tht it does not work. First attempt works, but the problem is if i want to user to input again he has to run the program again. I would like him to input right after the ouput without having to run the program again

Sunny55 Over a year ago

hang on ill put a screenshot of pycharm, that might explain my problem to you

Sunny55 Over a year ago

Someone helped me solve it actually. I needed to put it in a function. to be able to ask for input a second time. Thank you so much for trying to help me. Sorry I was bad at explaining it. I'm still learning python, so i am really bad at explaining it properly. Sorry!

Jeff Huang Over a year ago

No worries! Best of luck in your future coding endeavors!

Sunny55 Over a year ago

Ah I see what you did there. You made another for loop. That's pretty clever

|

Austin · Accepted Answer · 2020-03-08 06:20:32Z

2

This is exactly what functions are for. Wrap your logic in a function and call it wherever you need:

def check_prime(x):
    for i in range(2,x):  
        if(x % i ==0):      
            print("not Prime")  
            break  
    else :  
        print("Prime")  

x = int(input())
check_prime(x)  # first number
x = int(input())
check_prime(x)  # another number

Note if you want some n numbers to be entered, using an infinite loop to read input() can avoid repetition.

answered Mar 8, 2020 at 6:20

Austin

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1 Comment

Sunny55 Over a year ago

Oh my god! that is exactly what I needed. Thank you so much. I haven't learned about functions yet so I was struggling. Thank you.

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