Python - Infinite while loop, break on user input

user_1117216 0
Viewed 39998

I have an infinite while loop that I want to break out of when the user presses a key. Usually I use raw_input to get the user's response; however, I need raw_input to not wait for the response. I want something like this:

print 'Press enter to continue.'
while True:
    # Do stuff
    #
    # User pressed enter, break out of loop

This should be a simple, but I can't seem to figure it out. I'm leaning towards a solution using threading, but I would rather not have to do that. How can I accomplish this?

while-loop user-input python
7 Answers

I could not get some of the popular answers working. So I came up with another approach using the CTRL + C to plug in user input and imbibe a keyboard interrupt. A simple solution can be using a try-catch block,

i = 0
try:
    while True:
        i+=1
        print(i)
        sleep(1)
except:
    pass
# do what you want to do after it...

I got this idea from running a number of servers like flask and django. This might be slightly different from what the OP asked, but it might help someone else who wanted a similar thing.

user_57716170

I have defined the function which ask number input from the user and returns the factorial of that number. If user wants to stop they have to press 0 and then it will exit from the loop. We can specify any specific key to input 'n' to exit from the loop.

import math

def factorial_func(n):

    return math.factorial(n)

while True:
    n = int(input("Please enter the number to find factorial: "))
    print(factorial_func(n))
    if n == 0:
       exit()
user_150652630
Related