[issue2898] Add memory footprint query

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Guido, recently you've been opposed to adding more slots.  Any opinions 
on this one?  Also, is this something you want an additional builtin 
for?

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assignee:  -> gvanrossum
nosy: +gvanrossum

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