Am 22.06.2012 21:10, schrieb Yury Selivanov: > I think that if a function lacks an annotation, that should be reflected > in the same way for its signature. > > Currently: > > if hasattr(signature, 'return_annotation'): > > If we use Signature.empty: > > if signature.return_annotation is not signature.empty: > > So (in my humble opinion) it doesn't simplify things too much. > And also you can use 'try .. except AttributeError .. else' blocks, > which make code even more readable.
The second form has two benefits: * you get a sensible error message when you mistype the name of the attribute. hasattr(signature, 'return_annotatoin') is clearly an error, hard to notice with the naked eye and passes silently. * modern Python IDEs have code completion. "signature.re<TAB> is not signature.em<TAB>" safes key strokes. Christian _______________________________________________ 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/archive%40mail-archive.com
