Validation error messages for integers, how to?

Question

I've been working on a sleep calculator that needs a validation error message. The code that I need to validate is:

hourspernight = int(input("How many hours do you sleep in a day?")
hoursperweek = hourspernight * 7
input("You Sleep for",hoursperweek,"hours every week!")

I need to add validation so that, if the user inputs a character that is not an integer, it shows an error message asking for an integer.

Have you read e.g. http://stackoverflow.com/q/23294658/3001761? Also, why is this tagged Java? — jonrsharpe, Jan 27 '15 at 22:55
Java tag removed -- come on now, no language tag spam please! Let's stick with relevant tags only. — Hovercraft Full Of Eels, Jan 27 '15 at 23:02

score 1 · Accepted Answer · answered Jan 27 '15 at 23:00

1

Use a try/except inside a while loop which will keep asking for input until the user enters something valid:

while True:
    try:
       hourspernight = int(input("How many hours do you sleep in a day?"))
       break
    except ValueError:
        print("Invalid input")

hoursperweek = hourspernight * 7
print ("You Sleep for {} hours every week!".format(hoursperweek))

answered Jan 27 '15 at 23:00

Padraic Cunningham

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Thanks soo much, funnily enough i found the answer half an hour ago my ones a bit different though as i added another validation wait ill show you – Infynite Life Jan 27 '15 at 23:28
I presumed the second input should have been a print as you don't seen to be asking anything, you can either add a separate except block or just add it to the same – Padraic Cunningham Jan 27 '15 at 23:44

Validation error messages for integers, how to?

1 Answers1