Author vstinner
Recipients Mark.Shannon, christian.heimes, jdemeyer, lukasz.langa, pablogsal, petr.viktorin, pitrou, vstinner
Date 2019-09-03.12:21:13
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <1567513273.65.0.888277214763.issue38006@roundup.psfhosted.org>
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Content
I failed to write a reproducer from scratch. So let me share my notes here. The first point is that remove() function of WeakValueDictionary keeps WeakValueDictionary.data alive like that:

---
class NoisyDel:
    def __del__(self):
        print("dealloc data dict")

def create_closure():
    data = {0: NoisyDel()}
    def remove():
        return data
    return remove

remove = create_closure()
print("clear ")
remove = None
print("exit")
---

data is only deleted once remove is cleared.
History
Date User Action Args
2019-09-03 12:21:13vstinnersetrecipients: + vstinner, pitrou, christian.heimes, petr.viktorin, lukasz.langa, Mark.Shannon, jdemeyer, pablogsal
2019-09-03 12:21:13vstinnersetmessageid: <1567513273.65.0.888277214763.issue38006@roundup.psfhosted.org>
2019-09-03 12:21:13vstinnerlinkissue38006 messages
2019-09-03 12:21:13vstinnercreate