Bugs item #1275608, was opened at 2005-08-29 10:30 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1275608&group_id=5470
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Python Interpreter Core Group: None Status: Open Resolution: None Priority: 5 Submitted By: Armin Rigo (arigo) Assigned to: Michael Hudson (mwh) Summary: dict key comparison swallows exceptions Initial Comment: This is an old one that has just biten again and cost a lot of debugging time again: the dict lookup function swallows all errors during key comparison. This is bad in itself, but if the current stack depth is just wrong then *any* comparison will raise a RuntimeError and lookup will pretend that the dictionary is essentially empty. The attached sample program shows this and crashes with a KeyError instead of a RuntimeError. While at the C level there is a basic compatibility problem involved (PyDict_GetItem() not allowed to raise any exception -- see http://thread.gmane.org/gmane.comp.python.devel/62427), I think it should be possible to improve the situation on the Python interface. Unless someone points me to something I missed, I plan to come up with a patch that changes the internal dict functions (including lookdict()) to let exceptions pass through, and have the exceptions swallowed only by the PyDict_*() API functions that require it. The possible (remote) incompatibility here is existing code relying on the exceptions being swallowed -- either Python code, or C code using PyObject_GetItem() or PyMapping_GetItemString(). Such code deserves to be shot down in my opinion. Assigned to mwh for his feedback (not because I want him to write the patch!). ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1275608&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
