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PEP 1: Add a separate "Provisional" PEP status (#577) 

This adds an explicit "Provisional" status for PEPs, making
it easier to track which PEPs are truly Final, and which
are pending further further public feedback based on
their initially published reference implementations.
This commit is contained in:
Nick Coghlan 2018-07-08 11:50:57 +10:00 committed by GitHub
parent 3714aa1cef
commit 307dda38d4
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8 changed files with 637 additions and 12 deletions
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35
pep-0001.txt
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@ -245,7 +245,22 @@ Once a PEP has been accepted, the reference implementation must be
completed. When the reference implementation is complete and incorporated
into the main source code repository, the status will be changed to "Final".
A PEP can also be assigned status "Deferred". The PEP author or an
To allow gathering of additional design and interface feedback before committing
to long term stability for a language feature or standard library API, a PEP
may also be marked as "Provisional". This is short for "Provisionally Accepted",
and indicates that the proposal has been accepted for inclusion in the reference
implementation, but additional user feedback is needed before the full design
can be considered "Final". Unlike regular accepted PEPs, provisionally accepted
PEPs may still be Rejected or Withdrawn *even after the related changes have
been included in a Python release*.
Wherever possible, it is considered preferable to reduce the scope of a proposal
to avoid the need to rely on the "Provisional" status (e.g. by deferring some
features to later PEPs), as this status can lead to version compatibility
challenges in the wider Python ecosystem. PEP 411 provides additional details
on potential use cases for the Provisional status.
A PEP can also be assigned the status "Deferred". The PEP author or an
editor can assign the PEP this status when no progress is being made
on the PEP. Once a PEP is deferred, a PEP editor can re-assign it
to draft status.
@ -267,7 +282,16 @@ an API can replace version 1.
The possible paths of the status of PEPs are as follows:
.. image:: pep-0001-1.png
.. image:: pep-0001-1.svg
While not shown in the diagram, "Accepted" PEPs may technically move to
"Rejected" or "Withdrawn" even after acceptance. This will only occur if
the implementation process reveals fundamental flaws in the design that were
not noticed prior to acceptance of the PEP. Unlike Provisional PEPs, these
transitions are only permitted if the accepted proposal has *not* been included
in a Python release - released changes must instead go through the regular
deprecation process (which may require a new PEP providing the rationale for
the deprecation).
Some Informational and Process PEPs may also have a status of "Active"
if they are never meant to be completed. E.g. PEP 1 (this PEP).
@ -281,6 +305,11 @@ reached the Final state. Once a PEP has been completed, the Language and
Standard Library References become the formal documentation of the expected
behavior.
If changes based on implementation experience and user feedback are made to
Standards track PEPs while in the Accepted or Provisional State, those changes
should be noted in the PEP, such that the PEP accurately describes the state of
the implementation at the point where it is marked Final.
Informational and Process PEPs may be updated over time to reflect changes
to development practices and other details. The precise process followed in
these cases will depend on the nature and purpose of the PEP being updated.
@ -379,7 +408,7 @@ optional and are described below. All other headers are required. ::
Author: <list of authors' real names and optionally, email addrs>
* BDFL-Delegate: <PEP czar's real name>
* Discussions-To: <email address>
Status: <Draft | Active | Accepted | Deferred | Rejected |
Status: <Draft | Active | Accepted | Provisional | Deferred | Rejected |
Withdrawn | Final | Superseded>
Type: <Standards Track | Informational | Process>
* Content-Type: <text/x-rst | text/plain>

2
pep-0484.txt
View File

@ -5,7 +5,7 @@ Last-Modified: $Date$
Author: Guido van Rossum <guido@python.org>, Jukka Lehtosalo <jukka.lehtosalo@iki.fi>, Łukasz Langa <lukasz@python.org>
BDFL-Delegate: Mark Shannon
Discussions-To: Python-Dev <python-dev@python.org>
Status: Accepted
Status: Provisional
Type: Standards Track
Content-Type: text/x-rst
Created: 29-Sep-2014

2
pep-0517.txt
View File

@ -6,7 +6,7 @@ Author: Nathaniel J. Smith <njs@pobox.com>,
Thomas Kluyver <thomas@kluyver.me.uk>
BDFL-Delegate: Nick Coghlan <ncoghlan@gmail.com>
Discussions-To: <distutils-sig@python.org>
Status: Accepted
Status: Provisional
Type: Standards Track
Content-Type: text/x-rst
Created: 30-Sep-2015

4
pep-0518.txt
View File

@ -7,8 +7,8 @@ Author: Brett Cannon <brett@python.org>,
Donald Stufft <donald@stufft.io>
BDFL-Delegate: Nick Coghlan
Discussions-To: distutils-sig <distutils-sig at python.org>
Status: Accepted
Type: Informational
Status: Provisional
Type: Standards Track
Content-Type: text/x-rst
Created: 10-May-2016
Post-History: 10-May-2016,

18
pep0/output.py
View File

@ -42,6 +42,7 @@ def sort_peps(peps):
and essentially dead."""
meta = []
info = []
provisional = []
accepted = []
open_ = []
finished = []
@ -74,6 +75,8 @@ def sort_peps(peps):
info.append(pep)
else:
historical.append(pep)
elif pep.status == 'Provisional':
provisional.append(pep)
elif pep.status in ('Accepted', 'Active'):
accepted.append(pep)
elif pep.status == 'Final':
@ -82,7 +85,8 @@ def sort_peps(peps):
raise PEPError("unsorted (%s/%s)" %
(pep.type_, pep.status),
pep.filename, pep.number)
return meta, info, accepted, open_, finished, historical, deferred, dead
return (meta, info, provisional, accepted, open_,
finished, historical, deferred, dead)
def verify_email_addresses(peps):
@ -140,8 +144,8 @@ def write_pep0(peps, output=sys.stdout):
print(u"Index by Category", file=output)
print(file=output)
write_column_headers(output)
(meta, info, accepted, open_, finished,
historical, deferred, dead) = sort_peps(peps)
(meta, info, provisional, accepted, open_,
finished, historical, deferred, dead) = sort_peps(peps)
print(file=output)
print(u" Meta-PEPs (PEPs about PEPs or Processes)", file=output)
print(file=output)
@ -153,6 +157,12 @@ def write_pep0(peps, output=sys.stdout):
for pep in info:
print(constants.text_type(pep), file=output)
print(file=output)
print(u" Provisional PEPs (provisionally accepted; interface may still change)",
file=output)
print(file=output)
for pep in provisional:
print(constants.text_type(pep), file=output)
print(file=output)
print(u" Accepted PEPs (accepted; may not be implemented yet)", file=output)
print(file=output)
for pep in accepted:
@ -163,7 +173,7 @@ def write_pep0(peps, output=sys.stdout):
for pep in open_:
print(constants.text_type(pep), file=output)
print(file=output)
print(u" Finished PEPs (done, implemented in code repository)", file=output)
print(u" Finished PEPs (done, with a stable interface)", file=output)
print(file=output)
for pep in finished:
print(constants.text_type(pep), file=output)

8
pep0/pep.py
View File

@ -169,7 +169,8 @@ class PEP(object):
type_values = (u"Standards Track", u"Informational", u"Process")
# Valid values for the Status header.
# Active PEPs can only be for Informational or Process PEPs.
status_values = (u"Accepted", u"Rejected", u"Withdrawn", u"Deferred",
status_values = (u"Accepted", u"Provisional",
u"Rejected", u"Withdrawn", u"Deferred",
u"Final", u"Active", u"Draft", u"Superseded")
def __init__(self, pep_file):
@ -229,6 +230,11 @@ class PEP(object):
raise PEPError("Only Process and Informational PEPs may "
"have an Active status", pep_file.name,
self.number)
# Special case for Provisional PEPs.
if (status == u"Provisional" and self.type_ != "Standards Track"):
raise PEPError("Only Standards Track PEPs may "
"have a Provisional status", pep_file.name,
self.number)
self.status = status
# 'Author'.
authors_and_emails = self._parse_author(metadata['Author'])