[issue2898] Add memory footprint query

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

Can't you write this as a simple Python function using
type.__basicsize__ and type.__itemsize__?

In any case, if this is added somewhere it should not be a builtin. This
operation is nowhere near the usefulness to be one.

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nosy: +georg.brandl

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