Python vs. Lisp: scope issues

[anton muhin]

In addition to s[0] hack, I'd like to suggest the following code. Any
comments are highly appreciated:

class Scope(object):
pass

def accumulator():
scope = Scope()
scope.n = 0
def f(n):
scope.n += n
return scope.n
return f

a1 = accumulator()
print a1(1)
print a1(2)

a2 = accumulator()
print a2(10)
print a2(20)

regards,
anton.

[David Eppstein]

Re: Python vs. Lisp: scope issues

In article <bmh8bf$f79$1@n ews.peterlink.r u>,
anton muhin <antonmuhin.REM OVE.ME.FOR.REAL .MAIL@rambler.r u> wrote:
[color=blue]
> In addition to s[0] hack, I'd like to suggest the following code. Any
> comments are highly appreciated:
>
> class Scope(object):
> pass
>
> def accumulator():
> scope = Scope()
> scope.n = 0
> def f(n):
> scope.n += n
> return scope.n
> return f[/color]

Definitely cleaner than the s[0] hack. I'll have to remember that the
next time I need to work around the scope limitation.

--
David Eppstein http://www.ics.uci.edu/~eppstein/
Univ. of California, Irvine, School of Information & Computer Science