Nick Coghlan <ncoghlan@gmail.com> added the comment: Changing the affected components. Antoine and Benjamin are right, this needs to be handled as a documentation and education problem. Raymond's suggestion can too easily trigger infinite recursion and mine would block legitimate use cases in 3rd party code. For heapq, we can just fix it to include the fallbacks to the abstract versions if PyList_CheckExact() fails. ---------- assignee: -> docs@python components: +Documentation -Interpreter Core nosy: +docs@python _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue10977> _______________________________________