On Sun, Oct 27, 2019, at 19:17, Andrew Barnert via Python-ideas wrote: > On Oct 27, 2019, at 15:07, Ben Rudiak-Gould <benrud...@gmail.com> wrote: > > > > throw is an expression, not a statement, in C++. I see no reason raise > > couldn't be an expression in Python. It doesn't even need a special > > rule in the grammar: > > > > from __future__ import raise_function > > > > foo.setParseAction(lambda a, b, c: raise(MumbleMumble())) > > That’s a pretty big breaking change. Every line of code in every > library and app that raises would have to change to add parens.
Could raise be made an expression without adding parens? Or, C#'s throw is allowed in certain specific contexts (lambda bodies and conditional expressions) without being a general expression. Being in the true portion of a conditional expression in python would require parentheses *around* the raise, though, e.g. (raise whatever) if condition else true. _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/GU3MMEYFOIWTUQIFGCMXVDVLEXMRWN4B/ Code of Conduct: http://python.org/psf/codeofconduct/
