I have a set of patches about the correct __sizeof__ implementations (one has already been committed (issue #15456), 13 left, 2 of them published (#15469 for deque and #15475 for itertools)). The most tedious is to write tests for them, especially paranoid tests, on which Martin v. Löwis insists. For not to duplicate the supporting code, I suggest add (move from test_sys test) three utility functions to test.support module (issue #15467). Also from the use of the common code will benefit issues #15402 (for struct) and #15424 (for array). The testing for cElemetTree also will be easier.

Martin remarked that this adds new features to test.support and can only be done in 3.4. Question to release managers. Whether this is acceptable, if we do these functions private (with names that begin with an underscore)? Or would we have to copy the supporting code in every test file with __sizeof__ test?

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