Antoine Pitrou added the comment:

Well, I do think that it's not very important to make __sizeof__ strictly exact 
according to some specification. I'm also not sure we want to complicate 
maintenance when the calculation becomes tedious or difficult.

To me __sizeof__ is mostly an educational tool which gives a hint at the memory 
impact of an object, but cannot really convey a precise information except for 
trivial atomic types.

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<http://bugs.python.org/issue15490>
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