On 31/07/18 18:46, Steven D'Aprano wrote:
n Mon, Jul 30, 2018 at 12:41:20PM -0500, Abe Dillon wrote:
[Rhodri James]
On 29/07/18 16:12, Abe Dillon wrote:
> spam?.eggs.cheese.aardvark # why would you ever do this?
If you knew that if you really have something in "spam", your program
guarantees it will have an "eggs" attribute with a "cheese" attribute, etc,
you just don't know if "spam" is not None. It's the same insider knowledge
you would use if you wrote it out as
spam.eggs.cheese.aardvark if spam is not None else None
That's not the equivalent as described in PEP 505.
Yes it is. Rhodri is correct, although I admit that I hadn't realised
this point myself until he pointed it out. (That is why until now I've
been writing examples like "spam?.eggs?.cheese?.aardvark" which is
redundant.)
Doh! Yes, of course, the point was it was short-circuiting. This keeps
confusing me (easily done, I'll admit), which is probably not a point in
its favour.
--
Rhodri James *-* Kynesim Ltd
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