Re: problem manipulating a list belonging to a class

[Marc Leconte]

Thx all, good to know :)

Le dimanche 22 novembre 2009 à 15:16 -0800, Steve Howell a écrit :
> On Nov 22, 3:14 pm, Steve Howell  wrote:
> 
> > Explanations of why you need to write it that will follow...
> 
> I knew this had to be written up somewhere...
> 
> http://www.ferg.org/projects/python_gotchas.html#contents_item_6

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problem manipulating a list belonging to a class

[Marc Leconte]

Dear all,

I have a problem with the following code (ubuntu 8.04, Python 2.5.2):

class Toto(object):
def __init__(self, number, mylist=[]):
self.number=number
self.mylist=mylist
pass
pass

listA=Toto(number=1)
listB=Toto(number=2)

listA.mylist.append(5)
print "1) ", listA.mylist
print "2) ", listB.mylist

>> 1) [5]
>> 2) [5]

I would have expected
>> 1) [5]
>> 2) []

Thanks in advance for advice,
Marc.

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