[Python-Dev] PEP 409 update [was: PEP 409 (original) (raw)

Ethan Furman ethan at stoneleaf.us
Fri Feb 3 03:42:52 CET 2012

Nick Coghlan wrote:

FWIW, I expect the implementation will allow "raise exc from Ellipsis" as an odd synonym for "raise exc".

Are we sure we want that? Raising from something not an exception seems counter-intuitive (None being the obvious exception).

I'd want to allow "exc.cause = Ellipsis" to reset an exception with a previously set cause back to the default state,

Already done. :)

at which point the synonym follows from the semantics of "raise X from Y" as syntactic sugar for "exc = X; exc.cause = Y; raise exc"

I can see where it would make some sense that way, but it still seems odd.

~~Ethan~~