Or the internal memory id or whatever it's called. 2011/1/25 Izz ad-Din Ruhulessin <izzaddin.ruhules...@gmail.com>
> I think it has something to do with the physical id of the object > > 2011/1/25 Karim <karim.liat...@free.fr> > > >> Hello All, >> >> Just to share on rageous bug I encounter where 2 lists which "should" to >> be different (same id) because hold by different instances of the same class >> are not in fact DIFFERENT, see below: >> >> >>> class Device(): >> ... def __init__(self, parameters=[]): >> ... self.parameters = parameters >> ... def param(self): >> ... print(id(self.parameters)) >> ... >> >>> a=Device() >> >>> b=Device() >> >>> a.param() >> 140559202956568 >> >>> b.param() >> 140559202956568 >> >> When I discovered that I was puzzled because at the prompt: >> >> >>> a = [] >> >>> b = [] >> >>> id(a) >> 140559202956496 >> >>> id(b) >> 140559202957000 >> >> I am not really understanding why my init in the class made it refers to >> the same list object. >> What is the difference with 2nd example directly at the prompt? >> >> By the way, this one is ok: >> >> >>> class Device(): >> ... def __init__(self,parameters=None): >> ... self.parameters = None >> ... self.parameters = [] >> ... def param(self): >> ... print(id(self.parameters)) >> ... >> >>> a=Device() >> >>> b=Device() >> >>> b.param() >> 140559202956496 >> >>> a.param() >> 140559202956568 >> >> Karim >> >> >> _______________________________________________ >> Tutor maillist - Tutor@python.org >> To unsubscribe or change subscription options: >> http://mail.python.org/mailman/listinfo/tutor >> > >
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