[issue14055] Implement __sizeof__ for etree Element

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

__sizeof__ is supposed to account for just the object, not for the size of any object it refers to. If you want to compute total memory consumption, you should get a list of all objects, and then sum up __sizeof__. If some object would also include some of its referents, there would be a danger of accounting some memory twice.

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<http://bugs.python.org/issue14055>
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