Serhiy Storchaka added the comment:
> How do you stop walking your graph if it spans the whole graph of Python
> objects?
We can stop at specific types of objects (for example types and modules).
> If sys.getsizeof() is only useful for people who know *already* how an
object is implemented internally, then it's actually useless, because
those people can just as well do the calculation themselves.
It's why sys.getsizeof() is a low-level tool. We need high-level tool in the
stdlib. Even imperfect recursive counting will be better than confusing for
novices sys.getsizeof().
> (By the way, OrderedDict.__sizeof__ already breaks the rule you are trying to
> impose)
Yes, I know, and I think it is wrong.
Here is improved version of gettotalsizeof():
def gettotalsizeof(*args, exclude_types=(type, type(sys))):
seen = {}
stack = []
for obj in args:
if id(obj) not in seen:
seen[id(obj)] = obj
stack.append(obj)
sum = 0
while stack:
obj = stack.pop()
sum += sys.getsizeof(obj)
for obj in gc.get_referents(obj):
if id(obj) not in seen and not isinstance(obj, exclude_types):
seen[id(obj)] = obj
stack.append(obj)
return sum
>>> gettotalsizeof(sys)
206575
>>> gettotalsizeof(gc)
2341
>>> gettotalsizeof(sys.getsizeof)
60
>>> gettotalsizeof(gettotalsizeof)
60854
>>> class C: pass
...
>>> gettotalsizeof(C)
805
>>> gettotalsizeof(C())
28
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<http://bugs.python.org/issue19048>
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