Figuring out except ValueError

Question

Following along with Al Sweigarts python lessons and tried modifying his cat code some. I can input the "except ValueError" fine using just if and elif statements but I think using a while statement I am messing something up. I want this simple code to repeat when the user enters something incorrectly which is working so far. I just need to put in something that address a non integer as the input.

Is it something to do with break/continue statements not being used?

print('How many cats do you got')
numCats = int(input())

while numCats < 0:
    print('That is not a valid number')
    print('How many cats do you got')
    numCats = int(input())

if numCats >= 4:
        print('That is a lot of cats')

elif numCats < 4:
    print('That is not a lot of cats')

except ValueError:
    print('That was not a valid number')

I would just like the code to repeat if entering an invalid number while also repeating after a non-integer value. I can't get past the except ValueError part though. Thanks!

Answer 1

An except block requires a try block. It's within the try block that you find an exception and if found the except clause is run.

while True:
    try:        
        print('How many cats do you got: ')
        numCats = int(input())
        if numCats >= 0:
            break
        else:
            print('That was not a valid number')
    except ValueError:
        print('That was not a valid number')

if numCats >= 4:
    print('That is a lot of cats')

elif numCats < 4:
    print('That is not a lot of cats')