[issue18874] Add a new tracemalloc module to trace memory allocations

[STINNER Victor]

STINNER Victor added the comment:

I'm not sure that the DisplayGarbage class is still useful. The PEP 442 has been implemented in Python 3.4, so objects with __del__() method are no more "uncollectable". I don't know which kind of objects can enter the gc.garbage list (by default, not using gc.set_debug(gc.DEBUG_SAVEALL)).

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