R: [Python-Dev] Deprecating string exceptions

2002年3月28日 10:30:26 -0600

 Guido> You're looking at this all wrong. In the past, we've focused on
 Guido> saying "unqualified except is wrong". But IMO "except Exception"
 Guido> or "except StandardError" is just as wrong! You're still
 Guido> catching way more exceptions than is good for you.
Point taken.
 >> * I'm not saying you can't use "except:". I'm not advocating a
 >> semantic change to the meaning of "except:". (I am suggesting that
 >> KeyboardInterrupt should not inherit from StandardError.) I'm
 >> saying that the recommended usage for application programmers
 >> should be to avoid it.
 Guido> Sorry. I told you I hadn't read the thread the first time around.
So, do we agree on this point?
 Guido> We should fix the "except:" examples by catching a very specific
 Guido> error, like AttributeError, TypeError or KeyError. *Not* by
 Guido> catching Exception or StandardError.
Correct. That's what the long-standing bug #411881 is about. It just deals
with the standard library however, and doesn't delve into the stuff in
Tools, Demos, etc.
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