Bug in python!? persistent value of an optional parameter in function!

[John Nagle]

Paul Rubin wrote:
> "C Barr Leigh" <cpblPublic at gmail.com> writes:
> 
>>Help! Have I found a serious bug?
>>This seems like highly undesired behaviour to me. From the program
>>below, I get output:
> 
> 
> It is intentional, not a bug, see the docs.  Whether it's desirable is
> a different question.

    True.  It would make sense to disallow mutable values as
initial values for optional arguments.  The present behavior
is silly.

				John Nagle