class fields vs __getattr__

[Dave Cole]

>>>>> "Joshua" == Joshua Marshall <jmarshal at mathworks.com> writes:

Joshua> If you try to get a field of an object, it seems __getattr__
Joshua> is called only if no such field exists on the class.  For
Joshua> exmaple:

Joshua>  >>> class T:
Joshua>  ...   x = 1
Joshua>  ...   def __getattr__(self, name):
Joshua>  ...     return 2
Joshua>  ... 
Joshua>  >>> ob = T() 
Joshua>  >>> ob.foo
Joshua>  2
Joshua>  >>> ob.x
Joshua>  1

Joshua> I would have expected ob.x to return 2.  Can anyone explain
Joshua> the rationale behind this behavior?

__getattr__ is only used when Python cannot find the named attribute.

- Dave

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