Ah! That's it. Thanks for your help!
On Jul 8, 10:40 pm, James Bennett <ubernost...@gmail.com> wrote:
> On Wed, Jul 8, 2009 at 5:04 PM, derefed<dere...@gmail.com> wrote:
> > How is it that the method's local variables are being remembered? My
> > problem is solved by clearing the list at the end of the method, but
> > I'd like to know why it acts like this is the first place.
>
> This is a common thing encountered by new Python programmers. Python
> evaluates the default values of arguments to a function or method
> *once* and only once, so the empty list used initially is reused the
> next time you call the method. Only the next time you call the method
> it has items in it.
>
> This applies to any mutable object used as a default value of an
> argument -- lists, dictionaries, anything which can be changed and
> persist the changes. As such, the way to do this in Python is
>
> def printList(self, l=None):
> if l is None:
> l = []
> ...rest of method here...
>
> --
> "Bureaucrat Conrad, you are technically correct -- the best kind of correct."
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