Trouble accessing global vars

[Fernando Rodríguez]

Hi,

I haven't used Python in quite some time, and I'm bit puzzled by this:

counter = 0

class Blah(object):
	def run(self):
		counter += 1

b = Blah()
b.run()

Traceback (most recent call last):
  File "<pyshell#53>", line 1, in -toplevel-
    b.run()
  File "<pyshell#51>", line 3, in run
    counter += 1
UnboundLocalError: local variable 'counter' referenced before assignment

However, counter is not a local var, it's a global one. :-? Shouldn't this
work?