strange behaviour with keyword arguments and inheritance

Steve Holden steve at holdenweb.com
Tue Apr 17 04:37:50 CEST 2007


Jun.Jin.act+group.python at gmail.com wrote:
> On Apr 17, 9:36 am, livibetter <livibet... at gmail.com> wrote:
>> On Apr 17, 8:56 am, "matthewperpick" <matthewperp... at gmail.com> wrote:
>>
>>> Check out this toy example that demonstrates some "strange" behaviour
>>> with keyword arguments and inheritance.
>>> =================================
>>> class Parent:
>>>     def __init__(self, ary = []):
>>>         self.ary = ary
>> This should work:
>>
>> class Parent:
>>     def __init__(self, ary = []):
>>         self.ary = list(ary)
>>
>> And FYIhttp://groups.google.com/group/comp.lang.python/browse_thread/thread/...
> 
> livibetter has a better solution. the reason is that you need to
> create a new list object everytime, am I right?
> 
Yes, specifically on every *call*.

regards
  Steve
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