CODEWITHSUNDEEP
python-2.7
Jake Wohldmann
Jake Wohldmann

Reputation: 13

Python input/strings

(Python 2.7.10) So i am a beginner in python, just started learning about a week ago. I need some help with writing the code commented on lines 3 and 5.If the user enters a word instead of a numerical value then I need the program to tell them error and to restart. I commented the program to make it easier to understand. The program works just fine otherwise. Thank you.

## Ask user for age
age = input("Please enter your age.(numerical value)")
## If input is not a numerical value then tell the user "Error. Enter a numerical value"

## Restart program to let the user try again.

## If age is less than 18 then tell them they are too young
if age < 18:
    print (" Access denied. Sorry, you are not old enough.")
## If the user is 18 then grant them access 
elif age == 18:
    print ("Acess granted. You are just old enough to use this program!")
## If user is any age above 18 then grant them access
else:
    print ("Access granted.")

Upvotes: 1

Views: 60

Answers (2)

krisk
krisk

Reputation: 167

Change your age input part to this:

 #keep asking for age until you get a numerical value
 while True: 
     try:
         age=int(raw_input("Please enter your age.(numerical value)"))
         break
     except ValueError:
         print "Error. Enter a numerical value"

Upvotes: 0

hiro protagonist
hiro protagonist

Reputation: 46849

his is a way to make sure you get something that can be interpreted as integer from the user:

while True:
    try:
        # in python 3:
        # age = int(input('Please enter your age.(numerical value)'))
        # in python 2.7
        age = int(raw_input('Please enter your age.(numerical value)'))
        break
    except ValueError:
        print('that was not an integer; try again...')

the idea is to try to cast the string entered by the user to an integer and ask again as long as that fails. if it checks out, break from the (infinite) loop.

Upvotes: 1

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