Add A Loop Until User Inputs A Valid Answer?

I want to add a loop to this: question = raw_input('Reboot Y/N ') if len(question) > 0 and question.isalpha(): answer = question.upper() if answer == 'Y': print

Solution 1:

Add a while True at the top, and if user has entered correct output, break the loop: -

whileTrue:
    question = raw_input("Reboot Y/N ")
    iflen(question) > 0:
        answer = question.upper()
        if answer == "Y":
            print"Reboot"breakelif answer == "N":
            print"Reboot Canceled"breakelse:
            print"/ERROR/"

Solution 2:

something like this:

answer={"Y":"Reboot","N":"Reboot cancled"} #use a dictionary instead of if-else
inp=raw_input("Reboot Y/N: ")

while inp not in ('n','N','y','Y') :  #use a tuple to specify valid inputsprint"invalid input"
   inp=raw_input("Reboot Y/N: ")

print answer[inp.upper()]   

output:

$pythonso27.pyReboot Y/N:fooinvalidinputReboot Y/N:barinvalidinputReboot Y/N:yReboot