Ronald Oussoren <[email protected]> added the comment:
I'd expect that there'd be at least one instance of X alive due to
sys.last_value and in particular sys.last_traceback (which has a reference to
the stack frame which contains references to local variables).
Btw. I cannot reproduce this with Python 3.9.7 installed with the Python.org
installer (on MacOS 11):
Python 3.9.7 (v3.9.7:1016ef3790, Aug 30 2021, 16:25:35)
[Clang 12.0.5 (clang-1205.0.22.11)] on darwin
When I introduce a reference loop the number of X() instances does grow, but
only until the cyclic garbage collector runs (for example when gc.collect is
called).
I used slightly tweaked code to investigate:
class Y:
pass
class X:
def __init__(self):
self.y = Y()
self.y.x = self
pass
def dump():
import gc
# gc.collect()
objs = gc.get_objects()
for obj in objs:
if isinstance(obj, X):
print(obj)
def f():
x = X()
raise Exception()
f()
----------
nosy: +ronaldoussoren
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Python tracker <[email protected]>
<https://bugs.python.org/issue45241>
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