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I suggested this change on Python-Dev last year
(http://mail.python.org/pipermail/python-dev/2003-November/040391.html).
 The use case I put forth at the time was as follows:

Use Case:  I have a program written in C that contains a
bunch of aggregate data structures (arrays of structs,
structs containing arrays, etc.) and I'm transmitting these
structures over a socket connection to a Python program that
then unpacks the data using the struct module.  Problem is
that I have to unpack the incoming data as
a flat sequence of data elements, and then repartition the
sequence into nested sequences to better reflect how the
data is structured in the C program.  It would be more
convenient to express these groupings as I'm unpacking the
raw data.