How to address a global variable in a function

[n179911]

On Aug 7, 8:29 pm, n179911 <n179... at gmail.com> wrote:
> HI,
>
> I have a global variable
>
> // line 8
> tx  = 0
>
> and then I have this function (start in line 12):
> def handleTranslate(result):
>         print line
>         txStr, tyStr = result.group(1), result.group(2)
>         print txStr, tyStr
>
>         tx += int(txStr)
>         ty += int(tyStr)
>
>         return
>
> But I am getting this error:
>     handleTranslate(result)
>   File "buildsvg.py", line 22, in handleTranslate
>     tx += int(txStr)
> UnboundLocalError: local variable 'tx' referenced before assignment
>
> How can I fix it?
> I have assigned 'tx' to 0 in line 8. I don't understand why i get this
> error.
>
> Thank you for any help.

I figure out my problem

put this in my function:
global tx