Fix Python – Difference between __getattr__ and __getattribute__


Asked By – Yarin

I am trying to understand when to define __getattr__ or __getattribute__. The python documentation mentions __getattribute__ applies to new-style classes. What are new-style classes?

Now we will see solution for issue: Difference between __getattr__ and __getattribute__


A key difference between __getattr__ and __getattribute__ is that __getattr__ is only invoked if the attribute wasn’t found the usual ways. It’s good for implementing a fallback for missing attributes, and is probably the one of two you want.

__getattribute__ is invoked before looking at the actual attributes on the object, and so can be tricky to implement correctly. You can end up in infinite recursions very easily.

New-style classes derive from object, old-style classes are those in Python 2.x with no explicit base class. But the distinction between old-style and new-style classes is not the important one when choosing between __getattr__ and __getattribute__.

You almost certainly want __getattr__.

This question is answered By – Ned Batchelder

This answer is collected from stackoverflow and reviewed by FixPython community admins, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0