Re: Default Argument Question

[Chris Rebert]

On Wed, Oct 29, 2008 at 9:14 AM, Paulo J. Matos <pocm@ecs.soton .ac.ukwrote:

Hi all,
>
Going through the tutorial brought up a question. Consider the functions:
>
def f(a, L=[]):
L.append(a)
return L
>
print f(3)
print f(9)
print f(7)
>
def f1(i = 0):
i = i + 1
print i
>
f1()
f1()
f1()
f1()
>
Since the f accumulates the values in L, I was expecting to see i
printing 1,2,3,4 but this doesn't happen.
Can someone please explain why and what is going on beneath the veil?

http://effbot.org/zone/default-values.htm explains this FAQ quite
well. Note that the "accumulati on" behavior of lists is considered an
aberration and is usually not desired.

Cheers,
Chris
--
Follow the path of the Iguana...

http://rebertia.com

>
Cheers,
>
--
Paulo Jorge Matos - pocmatos @ gmail.com
--

http://mail.python.org/mailman/listinfo/python-list

>

[Bruno Desthuilliers]

Re: Default Argument Question

Chris Rebert a écrit :
(snip)

Note that the "accumulati on" behavior of lists is considered an
aberration

By who ?