Bart van Deenen wrote:
Hi all.
I've stumbled onto a python behavior that I don't understand at all.
Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52)
# function
def X(l=[]):
l.append(1)
print l
# first call of X
X()
[1]
#second call of X
X()
[1, 1]
Where does the list parameter 'l'
Bart van Deenen wrote:
I've stumbled onto a python behavior that I don't understand at all.
http://effbot.org/zone/default-values.htm
Is this correct behavior or is it a Python bug?
Python's been out there for nearly 20 years. I think you safely can
assume that if this really was a bug,
Hi all.
I've stumbled onto a python behavior that I don't understand at all.
Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52)
# function
def X(l=[]):
l.append(1)
print l
# first call of X
X()
[1]
#second call of X
X()
[1, 1]
Where does the list parameter 'l' live between the two
On Aug 22, 11:13 am, Bart van Deenen
[EMAIL PROTECTED] wrote:
Hi all.
I've stumbled onto a python behavior that I don't understand at all.
Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52)
# function
def X(l=[]):
l.append(1)
print l
# first call of X
X()
[1]
#second call of X
On Fri, 22 Aug 2008 11:13:52 +0200, Bart van Deenen wrote:
I've stumbled onto a python behavior that I don't understand at all.
...
Does anyone have any pointers to the language documentation where this
behavior is described?
Yes, it's documented in FAQ:
Hi
Thanks all for your answers. I figured your solution already, but now I
understand where the behavior is from. One question remains: can I find my
parameter 'l' somewhere? I looked in a lot of objects, but couldn't find it.
Thanks
Bart.
[EMAIL PROTECTED] wrote:
On Aug 22, 11:13 am,
Wojtek Walczak schrieb:
On Fri, 22 Aug 2008 11:13:52 +0200, Bart van Deenen wrote:
I've stumbled onto a python behavior that I don't understand at all.
...
Does anyone have any pointers to the language documentation where this behavior
is described?
Yes, it's documented in FAQ:
Bart van Deenen a écrit :
(ot : please don't top post - corrected)
[EMAIL PROTECTED] wrote:
On Aug 22, 11:13 am, Bart van Deenen
[EMAIL PROTECTED] wrote:
# function def X(l=[]): l.append(1) print l
# first call of X X() [1]
#second call of X X() [1, 1]
Where does the list parameter 'l'
On Fri, 22 Aug 2008 11:41:18 +0200, Bart van Deenen wrote:
Thanks all for your answers. I figured your solution already, but now I
understand where the behavior is from. One question remains: can I find my
parameter 'l' somewhere? I looked in a lot of objects, but couldn't find it.
On Fri, 22 Aug 2008 11:42:03 +0200, Diez B. Roggisch wrote:
It's amazing. I didn't analyse this properly, but IMHO this issue is the
single most asked question (or rather the effects in produces) on this list.
Maybe we should get *really* explicit in
Diez B. Roggisch wrote:
It's amazing. I didn't analyse this properly, but IMHO this issue is the
single most asked question (or rather the effects in produces) on this
list.
I feel a bit dumb to ask a FAQ on the newsgroup. The problem with this
particular question is that I found it hard to
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