On Fri, Aug 7, 2009 at 11:29 PM, n179911<n179...@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.
By default, Python assumes that any variables assigned to in a function are local variables. To change this assumption, you need to declare that you want to reference a global variable. This is done by putting a `global` statement at the start of the function (i.e. `global tx`). In the future, you might STFW (in this case, for "UnboundLocalError") before posting to the newsgroup, as you would have found several explanations of this common newbie-biter. Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
