On Jan 9, 8:24 pm, Mike Meyer <[EMAIL PROTECTED]> wrote: > On Wed, 9 Jan 2008 13:47:30 -0500 (EST) "Steven W. Orr" <[EMAIL PROTECTED]> > 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? > > Nope. This is one of the things that makes lisper's complain that > Python doesn't have "real closures": you can't rebind names outside > your own scope (except via global, which won't work here).
Note that the 'nonlocal' keyword solves this problem in py3k: Python 3.0a1+ (py3k:59330, Dec 4 2007, 18:44:39) [GCC 4.0.1 (Apple Inc. build 5465)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> def inc(j): ... def f(): ... nonlocal j ... j += 1 ... return j ... return f ... >>> i = inc(3) >>> i() 4 >>> i() 5 >>> -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
