There is a StackOverflow question [1] that points to this on-line book
[2] which has a five-step sequence for looking up attributes:
> When retrieving an attribute from an object (print
> objectname.attrname) Python follows these steps:
>
> 1. If attrname is a special (i.e. Python-provided) attribute for
> objectname, return it.
>
> 2. Check objectname.__class__.__dict__ for attrname. If it exists and
> is a data-descriptor, return the descriptor result. Search all bases
> of objectname.__class__ for the same case.
>
> 3. Check objectname.__dict__ for attrname, and return if found. If
> objectname is a class, search its bases too. If it is a class and a
> descriptor exists in it or its bases, return the descriptor result.
>
> 4. Check objectname.__class__.__dict__ for attrname. If it exists and
> is a non-data descriptor, return the descriptor result. If it exists,
> and is not a descriptor, just return it. If it exists and is a data
> descriptor, we shouldn't be here because we would have returned at
> point 2. Search all bases of objectname.__class__ for same case.
>
> 5. Raise AttributeError
I'm thinking step 1 is flat-out wrong and doesn't exist. Does anybody
know otherwise?
~Ethan~
[1]
http://stackoverflow.com/q/10536539/208880
[2]
http://www.cafepy.com/article/python_attributes_and_methods/ch01s05.html
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