July 17, 2017
1:12 p.m.
On Mon, Jul 17, 2017, at 02:56 PM, Nick Coghlan wrote:
If Thomas is OK with it, I'd be fine with using "raise NotImplementedError" for that purpose.
I will implement this if it's what we decide, but I agree with Nathaniel that a sentinel value is probably more robust, because return values can't automatically bubble up from internal code like errors do.