__getattr__ and __cmp__

[Michel Sanner]

Hi,

This is using Python 1.5.2 under IRIX6.5

Could anyone tell me how to specialize __getattr__ without loosing default
instance comparison ?

here is what the problem is:

class A:
  def __init__(self):
      self.val=1

a1= A()
a2= A()

a1==a2 returns 0
a1==a1 returns 1 as expected

now when I add __getattr__

>>> class A:
...   def __init__(self):
...       self.value=1
...   def __getattr__(self, val):
...       if val[:2]=='__':
...          return self.__dict__[val]
...       elif val=='value':
...          print 'Sorry val is invisible'

>>> a1
getattr for : __repr__
<__main__.A instance at 100d4a90>
>>> a1.value
1   ##### __getattr__ does not get call ???
>>> a1 == a2
getattr for : __coerce__
getattr for : __cmp__
Traceback (innermost last):
  File "<stdin>", line 1, in ?
  File "tstcmp.py", line 8, in __getattr__
    return self.__dict__[member]
KeyError: __cmp__

I do not find the default object comparison any longer !

could anyone tell me what is happening ?

Thanks for any help

-Michel

-- 

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Michel F. Sanner Ph.D.                   The Scripps Research Institute
Assistant Professor			Department of Molecular Biology
					  10550 North Torrey Pines Road
Tel. (858) 784-2341				     La Jolla, CA 92037
Fax. (858) 784-2860
sanner at scripps.edu                        http://www.scripps.edu/sanner
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