Allan Feldman <[email protected]> added the comment:
Yup agree with all the points above, just wanted to point out that I think
self.value is strongly referenced (even though it's just internal references
and will be collected by the gc) during Foo.__del__ execution (annotated code
below), yet the WeakValueDictionary entry is cleared:
import gc
import sys
import weakref
cache = weakref.WeakValueDictionary()
class Bar:
pass
class Foo:
def __init__(self):
self._self = self
self.value = Bar()
cache[id(self.value)] = self.value
def __del__(self):
print(sys.getrefcount(self.value)) # -> 2
# the cache may or may not have self.value at this point
# even though self.value is strongly referenced!
print(list(cache.items())) # -> []
o = Foo()
del o
gc.collect()
----------
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Python tracker <[email protected]>
<https://bugs.python.org/issue40312>
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