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a small doubt

MRAB google at mrabarnett.plus.com
Sat Dec 20 21:36:52 EST 2008 
Piyush Anonymous wrote:
> i wrote this code
> --
> class Person(object):
>     instancesCount = 0
>     def __init__(self, title=""):
>         Person.instancesCount += 1
>         self.id <http://self.id> = "tempst"
>     def testprint(self):
>         print "blah blah"
>     def __getattribute__(self, name):
>         print "in get attribute"
> 
> a = Person()
> a.testprint()
> print a.id <http://a.id>
> -----
> but i am getting this error
> ----
> in get attribute
> Traceback (most recent call last):
>   File "trapmethodcall1.py", line 15, in <module>
>     a.testprint()
> TypeError: 'NoneType' object is not callable
> ------
> why is it so? __getattribute__ is called whenever an attribute or method 
> is called, rt? or if i set __getattribute__ , i cannot have methods in 
> class?
> 
> actually my aim is to trap all method calls and keep a counter which is 
> update whenever method called or returned. how should i go about it?
>  
a.testprint causes __getattribute__ to be called. That method returns 
None. a.testprint() is therefore None(), hence the exception.
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