Why can't I use this as a function?

Here in the code I have a function name 'boundry' my problem is that when I call this function nothing happens but when i copy the code and use it without the function it works so.....WHAT IS THE PROBLEM?

def boundry(padx,padx_change):
    if padx < 0:
       padx_change = 10

while True:

 for event in pygame.event.get():
    if event.type == pygame.QUIT:
    if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                padx_change = -10
            elif event.key == pygame.K_RIGHT:
                padx_change = 10
    elif event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                 padx_change = 0
## if padx < 0:
##       padx_change = 10
 padx += padx_change

Open in new window

dayv jonesAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Most likely variable scope.
Changing parameters can get tricky.
Flabio GatesCommented:
def boundry(padx,padx_change):
    if padx < 0:
       padx_change = 10

Open in new window

Because an integer (e.g., padx_change) is immutable.
See a discussion on stackoverflow here.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Flabio GatesCommented:
Question inactive
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.