Mark Dickinson <dicki...@gmail.com> added the comment:

That patch was a bit hasty in many respects;  here's a better one.

For 2.7, the scheme is as follows:  when packing a non-integer with an integer 
format:

(1) First __index__ is tried
(2) If the __index__ method doesn't exist, or the call to __index__ raises 
TypeError, then the __int__ method is tried.
(3) If the __index__ method raises something other than TypeError, or returns a 
non-integer, then struct.pack fails.

----------
Added file: http://bugs.python.org/file16748/struct_index_trunk2.patch

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