tzickel <icebr...@yahoo.com> added the comment:

It actually makes tons of sense that while the thread is running, that the 
object representing it is alive. After the thread finishes its work, the object 
dies.

>>> import time, threading, weakref, gc
>>> t = threading.Thread(target=time.sleep, args=(10,))
>>> wr = weakref.ref(t)
>>> t.start()
>>> del t
>>> gc.collect()
>>> wr()
<Thread(Thread-1, started 139937234327296)>
Wait 10 seconds...
>>> gc.collect()
>>> wr()

The thread is gone (which doesn't happen with the pool).

Anyhow, I've submitted a patch to fix the bug that was introduced 9 years ago 
on GH, feel free to check it.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34172>
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