Terry J. Reedy <tjre...@udel.edu> added the comment:
For beginners, 'is this a Python bug' questions should usually be directed elsewhere for initial review. https://docs.python.org/3/reference/compound_stmts.html#the-try-statement "When an exception has been assigned using as target, it is cleared at the end of the except clause. This is as if except E as N: foo was translated to except E as N: try: foo finally: del N This means the exception must be assigned to a different name to be able to refer to it after the except clause. Exceptions are cleared because with the traceback attached to them, they form a reference cycle with the stack frame, keeping all locals in that frame alive until the next garbage collection occurs." "l['e']" is the first new name. "b" in each locals is the second. Without "b = ..." there is no increase because l['e'] gets replaced on each call. But inserting each exception into the next locals (see "keeping all locals in that frame alive") in effect makes a linked list of frames and locals. If one wants to keep multiple exceptions around, best to copy just the info one want kept. ---------- nosy: +terry.reedy resolution: -> not a bug stage: -> resolved status: open -> closed _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue39782> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
