On 31/07/18 18:46, Steven D'Aprano wrote:
n Mon, Jul 30, 2018 at 12:41:20PM -0500, Abe Dillon wrote:
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
[Rhodri James] 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