[Python-Dev] __sizeof__ tests

[Serhiy Storchaka]

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?