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[Python-Dev] Bare except clauses in PEP 348

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Raymond Hettinger wrote:>... I propose that the transition plan be as simple as introducing> BaseException.  This allows people to write code that will work on both> 2.x and 3.0.  It doesn't break anything.>> The guidance for cross-version (2.5 to 3.0) code would be:>> * To catch all but terminating exceptions, write:>>     except (KeyError, SystemExit):>         raise>     except Exception:>         ...How about:       except BaseException, error:           if not isinstance(error, Exception):               raise           ...This would accommodate other invented exceptions  such as"FoundConvergance(BaseException)", which is my pseudo-examplefor an exiting exception that is not properly a subclass ofeither KeyError or SystemExit.  The idea is a relaxation stopswhen it doesn't move and may start generating something sillylike divide-by-zero.  Not the end of an App, but the end of a Phase.--Scott David DanielsScott.Daniels at Acm.Org

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