The initial version of the PEP entrenched the tracing mode distinction,
and was worded accordingly.
Now that tracing mode is only relevant as a historical artifact that is
being eliminated, the wording should make that clear.
Also removes a stale mention of Python 3.9.
* PEP 12: Clean up and modernize guidelines.
The peps@python.org list has been shut down, and everything is done via
GitHub pull requests. Also, we no longer need some of the older steps,
and it's easier to read if some of the obscure/unusual options are
buried away in parentheses.
Open to discussion, can split this up if it's controversial.
* PEP 12: Describe number allocation system
* Derp, best to lead people correctly! Thanks Brett
Co-authored-by: Brett Cannon <brett@python.org>
* Don't exclude non-mailing-list discussion targets
Thanks Brett
Co-authored-by: Brett Cannon <brett@python.org>
* PEP 12: Be inclusive of non-mailing-list forums again
* PEP 12: Recommend the use of GitHub's issue tracker for questions
Co-authored-by: Brett Cannon <brett@python.org>
* requires that all uses of bare names be qualified with the user's intent
* ensures that all name binding operations in patterns use the as keyword
* drops alignment with iterable unpacking syntax (always requires square brackets)
* drops alignment with class instantiation syntax (defines a new dedicated instance attribute matching syntax instead)
Naming:
* Rename Tuple
* Rename Tensor -> Array (it's less jargony, and I think it's the more general term)
* Rename Expand -> Unpack (to be consistent with the terminology for normal tuples)
* Rename ArgTs -> Ts, ReturnT -> R
* Rename 'type tuple variable' -> 'type variable tuple'
Semantic:
* Explicitly state that a TypeVarTuple can hold *zero* or more types
* Explicitly state that TypeVarTuple doesn't support variance or bound yet
* Support Union[*Ts]
* Support concatenating multiple unpacked TypeVarTuple when there's no ambiguity
* Support aliases
* Remove support for class overloads; replace with overloads of individual methods
Pedagogical:
* Reorder introductory material to make it clearer how TypeVarTuples behave when not unpacked, and to make it clearer that using them without unpacking them is a perfectly valid thing to do
* Remove example of unpacking being used with a regular Tuple rather than a TypeVarTuple (my main reason for wanting to include it was to emphasise that a TypeVarTuple behaves like a Tuple, but I think this is emphasised better in previous sections now, and since I don't think it has any use cases, it seems better to remove it to keep things shorter and more to the point)
* Replace Tuple[*Ts] with just Ts (now that we've settled on Ts definitely meaning "A Tuple filled with types", writing Tuple[*Ts] is redundant - it's exactly the same as Ts, but with more keystrokes)
* State explicitly that TypeVarTuple can be used with Callable
* Changes args_to_tuples example to args_to_lists (so it's clearer where the Tuple comes from)
* Show more examples of where Map can be used
* Move section on nesting Map to the 'Rationale and Rejected Ideas' section (it's complicated enough to be too distracting if it were in the main section, and since there isn't an obvious use-case, we leave it as an optional feature)
* Add section on a full example of an array type
* Remove ideas for future PEPs (to reduce length)
* Add more detail on the range of type concatenations that are allowable
Other:
* Add Pradeep to the authors list, since he's contributed so much :)
* Add Eric Traut in the acknowledgements
* Update Post-History
* Fix some references
* Fix first Array example to remove the need for a cast
* Various wording tweaks
(This draft will need some work before it is acceptable, see my message to typing-sig and my comments in the Google Doc. But I'd like to claim the PEP number.)
Pablo Galindo
Kevin P. Fleming
Stefano Borini
Inada Naoki
Christopher Wilcox
Brett Cannon
Mario Corchero
Nick Coghlan
Pradyun Gedam
Steve Dower
Mark Shannon
Dustin Ingram
Guido van Rossum
Ken Jin
Eric Traut
Chris Angelico
Mario Corchero
Larry Hastings
Ned Deily
방성범 (Bang Seongbeom)
Matthew Rahtz
Tim Gates
Patrick Reader