Richard Oudkerk added the comment:
Thanks for the doc cleanup -- I am rather busy right now.
Note that stuff does still get replaced by None at shutdown, and this can still
produce errors, even if they are much harder to trigger. If I run the
following program
import _weakref
import collections
a = "hello"
class Foo(object):
def __del__(self):
print(a)
collections.foo = Foo()
_weakref.foo = Foo()
then depending on the initial hashseed I get a reproducible error:
$ PYTHONHASHSEED=7 python-release /tmp/bad.py
Exception ignored in: <bound method Foo.__del__ of <__main__.Foo object at
0xb733db8c>>
Traceback (most recent call last):
File "/tmp/bad.py", line 8, in __del__
TypeError: 'NoneType' object is not callable
(Personally I would like to see a flag set late during shutdown which blocks
__del__ methods from running.)
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<http://bugs.python.org/issue19047>
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