Guido van Rossum wrote:
On Tue, 15 Mar 2005 00:05:32 +1000, Nick Coghlan <[EMAIL PROTECTED]> wrote:
... try:
... value += first
... except TypeError:
... raise TypeError("Cannot add first element %r to initial value %r" % (first, value))
No, no, no! NO! Never catch a general exception like that and replace it with one of your own. That can cause hours of debugging pain later on when the type error is deep down in the bowels of the += operation (or perhaps deep down inside something *it* invoked).
Ouch. Obviously, I hadn't thought about that. . .
Wasn't there a concept floating around some time ago to support exception chaining, so additional context information could be added to a thrown exception, without losing the location of the original problem?
Yes, but it didn't go anywhere. See http://www.python.org/dev/summary/2003-06-01_2003-06-30.html#pep-317 for the summary.
-Brett _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
