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.