getattr

This question is regarding the __getattr__ function defined for every
object.
Consider the following example

Assume that foo is an instance of class Foo, and the following are
references to foo's field "bar" which is an instance of class Bar

a) foo.bar
b) foo.bar.spam - spam is a member of "bar"

I want the above references to be handled by __getattr__. Hence I do
not have an entry for the 'bar' in foo.__dict__

Is there any way by which the __getattr__(self,attr) method can
determine that in
case a) attr == 'bar' is the final component in the reference unlike in
case b) where attr=='bar' is NOT the ultimate(final) component of
reference and is an intermediate component in the reference.

tia

.

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