That's all fine and good but in this case there may be "stealth errors". If the user/programmer is expecting the first value to hold but instead
On Fri, Jun 27, 2008 at 7:03 PM, Guido van Rossum <[EMAIL PROTECTED]> wrote: > On Fri, Jun 27, 2008 at 2:54 PM, Fred Drake <[EMAIL PROTECTED]> wrote: > > On Jun 27, 2008, at 5:23 PM, Benjamin Peterson wrote: > >> > >> I think code that uses this is probably already quite broken in some > >> fundamental way and putting the fix in 2.5 isn't much of a risk. > > > > I suspect the risk has more to do with breaking something else in Python > > than in breaking 3rd-party code in this case. > > > > I think it should be fixed for 2.5 as well, myself. > > Let me clarify why I want to be so careful with this. > > If there is code that was expected to work but due to a bug in our > code raises an exception, it's generally safe to fix this: people who > ran into the issue found that their code didn't work, used a > work-around, and that's the end of the story. > > But if there is code that was expected to *break* but due to a bug in > our code *doesn't* raise an exception, people can very well have > harmless occurrences of such code, and never noticed. Maybe their code > is "broken" in the sense that it doesn't produce the correct result, > but it may well be in a "don't care" way -- but if an upgrade suddenly > starts raising the exception, they are likely to get unhandled > exceptions where before they had none. This is particularly annoying > when the author of the program that breaks is not the user of the > program, to whose machine the upgrade was applied. > > In such cases I think it's better not to introduce new exceptions in > point-point releases. > > -- > --Guido van Rossum (home page: > http://www.python.org/~guido/<http://www.python.org/%7Eguido/> > ) > _______________________________________________ > 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/hall.jeff%40gmail.com > -- Haikus are easy Most make very little sense Refrigerator
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