Nested scopes question

[Fernando Pérez]

In the following code:

def foo():
    def bar():
        print 'x from foo',x
        x+=1

    x=0
    for i in range(5):
        bar()

foo()

the call to foo() raises a NameError b/c x is incremented, and python (2.2) 
then assumes it is a local variable. Is there a way to make python honor the 
nesting of the scopes (global doesn't work). The only solution I found was 
the rather unsightly one of putting my value for x inside a list:

def foo():
    def bar():
        print 'x from foo',x[0]
        x[0]+=1

    x=[0]  # put value in a list so nested scopes work like I want
    for i in range(5):
        bar()

foo()

Is there a better option?

Thanks,

f.