-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, I'm trying to create a machinery to handle renderer exceptions. Considere the following template: <span nevow:render="main_page"> <span nevow:pattern="main_pattern"> ... </span> <span nevow:pattern="safe_pattern"> <span nevow:render="handle_err">Oops, there was an exception</span> </span> </span> The idea is to define a base class so that, for each page based on such template, on renderer exceptions, the main pattern is deleted and the failsafe pattern is filled with a human readable error. For example: class basePage(rend.Page): def render_main_page(self, ctx, d): try: render_the_main_pattern(...) except Exception, err: self.strexception= str(err) render_the_safe_pattern(...) def render_handle_err(self, ctx, d): if hasattr(self, 'strexception'): return self.strexception return 'UfoError' class OtherPage(basePage): ... It would be very nice to have such machinery: how can I choose to render the safe_pattern if and only if the main pattern rendering fails? Otherwise, is there in your opinion a better strategy? - -- efphe Today is Setting Orange, the 55th day of Chaos in the YOLD 3174 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) iD8DBQFHwZRfi7obm7aBjHcRAhpvAJ9eSijml+0OgAgmsMW4PVCPUeuiLQCghSs6 lwaZFMx3tKi/W887lsh9MTY= =BUEA -----END PGP SIGNATURE-----