Hi Chris We're discussing. > 10) a ?. b ?. c > 11) (a ?. b) ?. c
I asked > So, are there any values of 'a' for which #10 and #11 don't give the > same result? You replied > I'm not prepared to put my neck out and say "They are absolutely > identical" and have people jump on me with some technicality. What is > your point here? I am willing to put my neck out and say a.b.c and (a.b).c are equivalent. And my understanding for PEP 505 is that #10 and #11 is that they are equivalent. You're right to be cautious. My understanding of PEP 505 is that #13. a ?. b ?. __str__ #14. (a ?. b) ?. __str__ are not equivalent. The first is None, and the other is None.__str__. That looks like a gotcha. (By the way, it was not my intention to catch you out. I'm simply looking for clarity. I wasn't aware of the gotcha until I started answering myself the question I had asked you.) However, the None object is somewhat special, in that all it's methods and double-under (dunder) methods. And one of them is __bool__. And we can't add or change the attributes of None. Chris, you don't have to reply to this. But I would be pleased if an expert could either tell me that my neck is safe, or produce a value of 'a' that cuts it off (so to speak). -- Jonathan _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
