Douglas Alan wrote: > Lenard Lindstrom <[EMAIL PROTECTED]> writes: > >>> You don't necessarily want a function that raises an exception to >>> deallocate all of its resources before raising the exception, since >>> you may want access to these resources for debugging, or what have >>> you. > >> No problem: >> >> [...] >> >> >>> class MyFile(file): >> def __exit__(self, exc_type, exc_val, exc_tb): >> if exc_type is not None: >> self.my_last_posn = self.tell() >> return file.__exit__(self, exc_type, exc_val, exc_tb) > > I'm not sure I understand you here. You're saying that I should have > the foresight to wrap all my file opens is a special class to > facilitate debugging? > > If so, (1) I don't have that much foresight and don't want to have > to. (2) I debug code that other people have written, and they often > have less foresight than me. (3) It would make my code less clear to > ever file open wrapped in some special class. >
Obviously you had the foresight to realize with statements could compromise debugging. I never considered it myself. I don't know the specifics of your particular project, what the requirements are. So I can't claim this is the right solution for you. But the option is available. > Or are you suggesting that early in __main__.main(), when I wish to > debug something, I do something like: > > __builtins__.open = __builtins__.file = MyFile > > ? > > I suppose that would work. No, I would never suggest replacing a builtin like that. Even replacing a definite hook like __import__ is risky, should more than one package try and do it in a program. > I'd still prefer to clear exceptions, > though, in those few cases in which a function has caught an exception > and isn't going to be returning soon and have the resources generally > kept alive in the traceback. To me, that's the more elegant and > general solution. > As long as the code isn't dependent on explicitly cleared exceptions. But if it is I assume it is well documented. -- Lenard Lindstrom <[EMAIL PROTECTED]> -- http://mail.python.org/mailman/listinfo/python-list
