counting references to an instance

Aahz aahz at pythoncraft.com
Wed Feb 4 22:22:26 CET 2004


In article <pan.2004.02.04.21.00.59.322564.7241 at sympatico.ca>,
Brian  <balex at sympatico.ca> wrote:
>On Wed, 04 Feb 2004 14:57:59 -0500, Aahz wrote:
>> In article <pan.2004.02.04.18.55.02.385092.6672 at sympatico.ca>, Brian
>> <balex at sympatico.ca> wrote:
>>>
>>>Is it possible to get an object to return the number of references there
>>>are to itself?
>>>
>>>Ex:
>>>
>>>class test(object):
>>> pass
>>>
>>>a = test()
>>>b = a
>>>
>>># Should print "2", if I knew the name of the method. print a.refCount()
>> 
>> sys.getrefcount(a) will do the trick -- but it will print 3.  Can you
>> figure out why?
> 
>Does the instance of test contain a reference to itself?

Nope.  Robert Brewer's response explained it.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"The joy of coding Python should be in seeing short, concise, readable
classes that express a lot of action in a small amount of clear code -- 
not in reams of trivial code that bores the reader to death."  --GvR



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