I don't see any conclusive evidence that this is a bug in the Python interpreter, so I'm going to close the issue.

Hana, if you are still having this problem, please join the main python mailing list https://mail.python.org/mailman/listinfo/python-list or newsgroup comp.lang.python, and we should be able to help you there. (But please don't post screen shots, copy and paste the text of the exception into your message.)