Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Instances of many builtin types are not weak referencable.

>>> weakref.ref(0)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: cannot create weak reference to 'int' object
>>> weakref.ref([])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: cannot create weak reference to 'list' object

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34830>
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