On Friday, September 4, 2009 4:52:11 PM UTC-7, Rami Chowdhury wrote: > > global no_picked > > no_picked = 0 > > > > def picked(object, event): > > no_picked += 1 > > print no_picked > > In order to be able to affect variables in the global scope, you need to > declare them global inside the function, and not at the global scope. So > your code should read: > > no_picked = 0 > > def picked(object, event): > global no_picked > no_picked += 1 > print no_picked > > I believe that will work. > > On Fri, 04 Sep 2009 16:43:27 -0700, Helvin <helvin...@gmail.com> wrote: > > > Hi, > > > > This increment thing is driving me nearly to the nuts-stage. > < > > > > I have a function that allows me to pick points. I want to count the > > number of times I have picked points. > > > > global no_picked > > no_picked = 0 > > > > def picked(object, event): > > no_picked += 1 > > print no_picked > > > > Error msg says: UnboundLocalError: local variable 'no_picked' > > referenced before assignment > > For some reason, no_picked does not increment, but the printing > > statement works. > > > > Do you know why? > > > > (I'm actually writing this for a vtkrenderwindowinteractor.) > > > > Helvin > > > > -- > Rami Chowdhury > "Never attribute to malice that which can be attributed to stupidity" -- > Hanlon's Razor > 408-597-7068 (US) / 07875-841-046 (UK) / 0189-245544 (BD)
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