R. David Murray added the comment: Because the second argument to format_traceback is supposed to be (is documented to be) an exception object. The fact that it used to work anyway in Python2 if you passed a string was an accident of the implementation. Likewise, settrace is documented to provide a value, not a string, so the fact that it provides a string is a bug. That needs to be fixed.
(As to specifically why chain defaults to True, it defaults to having the same behavior as the normal exception machinery.) ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue17413> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
