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

It can happen when some objects with __del__ are kept alive at the interpreter 
shutdown stage and outlive the builtins module. I have not seen such errors for 
a long time. Could you reproduce it on newer Python versions? Could you 
reproduce it with simpler script?

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue41830>
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