On 23 February 2014 02:29, Nick Coghlan <ncogh...@gmail.com> wrote: > On 22 Feb 2014 22:15, "Stephen J. Turnbull" <step...@xemacs.org> wrote: > > Antoine Pitrou writes: > > > Chris Angelico <ros...@gmail.com> wrote: > > > > hasattr(x,"y") <-> (x.y or True except AttributeError: False) > > > But it's not the same. hasattr() returns a boolean, not an arbitrary > > > value. > > I think he meant > > hasattr(x,"y") <-> (x.y and True except AttributeError: False) > > With PEP 463, the explicit equivalent of hasattr() would be something like > : > > hasattr(x,"y") <-> (bool(x.y) or True except AttributeError: False) > That would work, but I think I'd prefer:
hasattr(x,"y") <-> bool(x.y or True except AttributeError: False) Makes it clearer IMO that the entire expression will always return a boolean. If exception expressions already existed in the language, I would think there would be a strong argument for a library function hasattr(), but probably not a builtin. Tim Delaney
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