- Remove changes to comprehension scope
- Make := in comprehensions assign to containing non-comprehension scope
- Clarify binding precedence (tighter than comma, not at same level as =)
- Remove mention of more complex targets in the future
- Explicitly disallow toplevel :=
- Rewrite section on differences with =, enumerating all of them
- Remove "here's how this could be written without :=" from examples
- Tweak first paragraph of "Syntax and semantics"
- Add "Exception cases" (various explicit prohibitions)
- Clarify that lambda is a containing scope
- Clarify that := and = just don't mix
- Added "Open questions" section
- Added two new rejected alternatives: "Allowing commas to the right"
and "Always requiring parentheses"
- Minor edits
* Start a section on real code
* Correct/clarify "commas to the right" section
* Add Tim and Guido as authors
* Update abstract to mention :=
* Rule out targets conflicting with comprehension loop control
* Add timcode.txt as Appendix A
* Add os.fork() example
* Add TODOs about evaluation order
Competing proposal for PEP 572 that focuses on allowing
augmented assignments as expressions, and treats
"NAME := EXPR" primarily as an explanatory tool for
the updated augmented assignment semantics.
Follow-up to GH-648
The genpepindex script requires the headers to be in a particular order.
In pep-0539.txt the order was different, breaking the build for everyone.
* Rename `@runtime` to `@runtime_checkable`
* Postpone making mappings and sequences protocols, this can be done later in Python 3.8
* Update the implementation status
* More strict and precise specification for `isinstance()` and `issubclass()` with protocols.
* Few typos
* Allow the `python` command to not be installed, and other minor edits
- Distributions can omit the ``python`` command even when
``python2`` is installed in test environments, build systems,
and other controlled environments where being explicit is
valued more than user experience.
- Users, by a deliberate action, change
``python`` to invoke Python 3. Activating a venv counts as
such an action.
- Other edits and clarifications
* Add myself as an author
This removes any reference to the technical details of online PEP
publication from PEP 1, replacing it with a reference to the
README in the PEP repository.
It also updates the README with relevant cross-references to the
pythondotorg project (based on some process pointers provided by
Mariatta Wijaya).
Resolves GH-575.
Sumana Harihareswara
Ned Deily
Jelle Zijlstra
Nick Coghlan
Victor Stinner
Brett Cannon
Mizux
Géry Ogam
Antoine Pitrou
Guido van Rossum
Petr Viktorin
Mark Shannon
Ethan Smith
Carol Willing
jdemeyer
jseakle
Elvis Pranskevichus
Eric Snow
Ivan Levkivskyi
zhsj
Chen Shuaimin
Harmon
Chris Angelico