This is very reminiscent of the (rejected) PEP 463, Exception-catching
expressions (which I still hope will be resurrected some day). It would
allow you to write
y = (config["handler"]["parameters"]["y"] except KeyError: None)
(possibly the parentheses might not be required) which IMO is even
better; `except` makes the intent clearer than `with`.
Best wishes
Rob Cliffe
On 20/10/2021 03:05, h.vetin...@gmx.com wrote:
Baptiste Carvello wrote:
y = config["handler"]["parameters"]["y"] with KeyError as None
I love the look of this! While it doesn't address everything that PEP505 does,
that's IMO a good thing, because - as other people mentioned already - None
does too many things already.
On another note, the whole discussion reminds me of wg21.link/p0798, which is
about adding something quite similar to C++ (was accepted into C++23), and
contains a decent overview of how other languages solve the same thing.
Even though the approach there is probably not applicable (as all python types are
implicitly `Optional` in the sense of "can be None", i.e. that API would have
to be added all the way down to `object`), it's still ironic that C++'s `and_then` looks
more pythonic than what's proposed here.
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