Another dumb scope question for a closure.

[Waldemar Osuch]

On Jan 9, 3:52 pm, Waldemar Osuch <waldemar.os... at gmail.com> wrote:
> On Jan 9, 11:47 am, "Steven W. Orr" <ste... at syslang.net> wrote:
>
>
>
> > So sorry because I know I'm doing something wrong.
>
> > 574 > cat c2.py
> > #! /usr/local/bin/python2.4
>
> > def inc(jj):
> >      def dummy():
> >          jj = jj + 1
> >          return jj
> >      return dummy
>
> > h = inc(33)
> > print 'h() = ', h()
> > 575 > c2.py
> > h() =
> > Traceback (most recent call last):
> >    File "./c2.py", line 10, in ?
> >      print 'h() = ', h()
> >    File "./c2.py", line 5, in dummy
> >      jj = jj + 1
> > UnboundLocalError: local variable 'jj' referenced before assignment
>
> > I could have sworn I was allowed to do this. How do I fix it?
>


> I have seen this approach on ActiveState Cookbook but can not find a
> reference to it right now.
>
> >>> def inc(jj):
>
> ...     def dummy():
> ...         dummy.jj += 1
> ...         return dummy.jj
> ...     dummy.jj = jj
> ...     return dummy
> ...>>> h = inc(33)
> >>> h()
> 34
> >>> h()
> 35
> >>> i = inc(12)
> >>> i()
> 13
> >>> i()
>
> 14
>
> Waldemar

Here it is:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/474122