python bug?

[Russell Blau]

"Anthony Petropoulos" <apetrop at gmail.com> wrote in message
news:mailman.815.1090848123.5135.python-list at python.org...
> Hi,
>
> When running this simple code:
> -------
> class Dada:
>         a = []
>         def __init__(self, arg):
>                 self.a.append(arg)
>
> d1 = Dada("pro")
> d2 = Dada("hoho")
>
> print d1.a, d2.a
> ------------
> I get the output ['pro', 'hoho'] ['pro', 'hoho'], instead of what I
> expected: ['pro'] ['hoho'].
>
> Is this a feature? Is there something I'm missing?

You established "a" as an attribute at the class level, not at the instance
level.  Then you had each instance append something to the class attribute.
The output is correct; it is your expectation that needs to be modified.
:-)

To see the difference, try changing the body of your __init__ method to
read:
    self.a = [arg]

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