Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Tracking objects that do not need this will just add work to the garbage 
collector. Not all instances of trackable types should be tracked, for example 
the empty tuple and some dicts are not tracked.

>>> gc.is_tracked(())
False
>>> gc.is_tracked((1, 2))
True
>>> gc.is_tracked({1: None})
False
>>> gc.is_tracked({1: []})
True

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue18372>
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