[Python-Dev] PEP 495 Was: PEP 498: Literal String Interpolation is ready for pronouncement

[Glenn Linderman]

On 9/11/2015 5:40 PM, Alexander Belopolsky wrote:

> The insanity I am dealing with now
...
> But the decision to allow interzone t - s was made long time ago and 
> it is a PEP 495 goal to change that.

The first few paragraphs you wrote, which I elided, are a great 
explanation of why things work in ways that might be unexpected, and by 
including in the descriptions other things that might be unexpected, it 
helps people realize that the need to understand what the operators 
really mean, when applied to classes, rather than numbers.  Of course, 
even floating point number operations and integer division only 
approximate mathematical reality, if you are looking for more examples.

But the beginning phrase about "insanity" should probably be elided in 
documentation, yet the body could very well be appropriate for tutorial 
documentation, even if not reference documentation, although I'd not 
object to finding it there.

The last phrase, about it being a PEP 495 goal to change that, might be 
true, but if it changes it, then it would be a confusing and backward 
incompatible change.

>
> Yes, but are we willing to accept that datetimes have only partial order?

That's what the politicians gave us. These are datetime objects, not 
mathematical numbers.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-dev/attachments/20150911/af98dcf3/attachment.html>