(original) (raw)

On 3 February 2012 15:02, Nick Coghlan <ncoghlan@gmail.com> wrote:

Both will be allowed - in 3.x, '...' is just an ordinary expression
that means exactly the same thing as the builtin Ellipsis:

>>> Ellipsis
Ellipsis
>>> ...
Ellipsis

I'd totally forgotten that was the case in 3.x ... it's still not exactly common to use Ellipsis/... directly except in extended slicing.

Sane code almost certainly won't include *either* form, though. If

you're reraising an exception, you should generally be leaving

__cause__ and __context__ alone, and if you're raising a *new*

exception, then __cause__ will already be Ellipsis by default - you

only need to use "raise X from Y" to set it to something *else*.

Absolutely - I can't think of a reason to want to reraise an existing exception while supressing any existing __cause__ in favour of __context__. But I'm sure someone can.

Tim Delaney