Salut André,
On 01.08.07, Andre Wobst wrote:
> still, you have different instances in your example. The only problem
> in your example is, that the garbage collector throws away the
> document instance immediately again. Check this out:
>
> from pyx import *
>
> class slides:
> def document(self):
> d = document.document()
> return d
>
> l = []
> s = slides()
> for i in range(4):
> d = s.document()
> print d
> l.append(d)
>
> ... and you'll get diffent instances. Still, you may have some kind of
> a problem ... and there might be bugs. But as far as your example is
> concerned, everything is fine.
You are right. That explains the equal memory addresses. I had,
however the problem that upon writing the second document, the content
of the first was still there. In the meanwhile, I found the reason for
that: the dangerous initialization of empty lists:
class document:
def __init__(self, pages=[]):
self.pages = pages
The first use of this as document.document() and then adding some
pages modifies the standard argument (which was [] initially). All
further instances are then initialized with this nonempty list.
Which solution do you prefer:
class document:
def __init__(self, pages=[]):
self.pages = pages[:]
class document:
def __init__(self, pages=None):
if pages is None:
self.pages = []
else:
self.pages = pages
I will scan through the code to eliminate all other occurrences of
this problem.
Michael.
--
Michael Schindler
Laboratoire de Physico-Chimie Théorique.
ESPCI. 10 rue Vauquelin, 75231 Paris cedex 05, France.
Tel: +33 (0)1 40 79 45 97 Fax: +33 (0)1 40 79 47 31
http: www.pct.espci.fr/~michael
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