Integer input

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March 26th, 2004, 10:34 PM

Questioner

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Integer input

I'm gonna accept numbers from users, and I do it like this :

if this's gonna accept number 1 until 7 only :

Code:

choice = raw_input("Enter your choice : ")
if '1' <= choice <= '7':
    if choice == '1':
        do something
    ...
else:
    pass

As you can see, I use raw_input() instead of input() to accept integers from user, so that it doesnt cause errors when someone accidentally key in a character. But I'm wondering, is there a faster way to do similar validation? Thanks in advance.

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Last edited by Questioner : March 26th, 2004 at 10:38 PM.

March 26th, 2004, 11:13 PM

Strike

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Just int() the input and catch any ValueError you get from invalid int input.

March 27th, 2004, 12:54 AM

Boceifus

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I don't know if this is any faster,but it will loop the raw_input if the input is out of range,or if there's a ValueError(input is a character,not a number).I'm sure there's a better way to do it,but hopefully this will give you some ideas.

Code:

answer = raw_input('Enter a number.Valid range is 1-7:')

while True: 
    try: 
        int(answer)
        while int(answer) not in range(1, 7): 
            answer = raw_input('\nInvalid number!Valid range is 1-7:')
            
        break
    
    except ValueError: 
        answer = raw_input('\nYou must specify a number!Valid range is 1-7:')
        
        
if answer == '1': 
    print 'do response 1'
                           
elif answer == '2': 
    print 'do response 2'
       
elif answer == '3': 
    print 'do response 3'

elif answer == '4': 
    print 'do response 4'

elif answer == '5': 
    print 'do response 5'

elif answer == '6': 
    print 'do response 6'

elif answer == '7': 
    print 'do response 7'

Code Block Generated With Py2Html

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March 27th, 2004, 07:43 PM

TheBlackMamba

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Just fyi, I wrote a command line UI module with a spinbox widget that does exactly what you're trying to do.
Here's the URL.
http://www.python.org/pypi?:action=....py&version=1.4

the download link will be up soon