10
Python’s standard library has gc
module containing garbage collector API. One of the function you possible want to have is
gc.get_objects()
This function returns list of all objects currently tracked by garbage collector. The next step is to analyze it.
If you know the object you want to track you can use sys
module’s getrefcount
function:
>>> x = object()
>>> sys.getrefcount(x)
2
>>> y = x
>>> sys.getrefcount(x)
3
85
Python’s gc
module has several useful functions, but it sounds like gc.get_referrers()
is what you’re looking for. Here’s an example:
import gc
def foo():
a = [2, 4, 6]
b = [1, 4, 7]
l = [a, b]
d = dict(a=a)
return l, d
l, d = foo()
r1 = gc.get_referrers(l[0])
r2 = gc.get_referrers(l[1])
print r1
print r2
When I run that, I see the following output:
[[[2, 4, 6], [1, 4, 7]], {'a': [2, 4, 6]}]
[[[2, 4, 6], [1, 4, 7]]]
You can see that the first line is l
and d
, and the second line is just l
.
In my brief experiments, I’ve found that the results are not always this clean. Interned strings and tuples, for example, have more referrers than you would expect.
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Source:stackexchange.com