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Perhaps, does it happen when trying to print a long output? If so, then http://bugs.python.org/issue1529353 might be the upstream ticket. ** Bug watch added: Python Roundup #1529353 http://bugs.python.org/issue1529353 ** Changed in: python3.4 (Ubuntu) Status: New => Incomplete ** Summary changed: - Hangs from time to time + IDLE hangs from time to time -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1312061 Title: IDLE hangs from time to time To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/python3.4/+bug/1312061/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs