[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 20d56bd41b56023ce9fa3739c0c9aa8be8d48bfa by Markus Gerstel in 
branch '3.8':
bpo-39674: Fix collections ABC deprecation notice (GH-25281)
https://github.com/python/cpython/commit/20d56bd41b56023ce9fa3739c0c9aa8be8d48bfa


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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[Roundup Robot]

Change by Roundup Robot :


--
pull_requests: +24017
pull_request: https://github.com/python/cpython/pull/25281

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[Roundup Robot]

Change by Roundup Robot :


--
nosy: +python-dev
nosy_count: 5.0 -> 6.0
pull_requests: +24016
pull_request: https://github.com/python/cpython/pull/25280

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[ปพนพัชร์ บรรพจันทร์]

Change by ปพนพัชร์ บรรพจันทร์ :


--
components: +Unicode -Library (Lib)
nosy: +ezio.melotti
versions: +Python 3.10 -Python 3.9

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

STINNER Victor  added the comment:

I close this issue.

So far, it seems like the number of incompatible changes in Python 3.9 is 
reasonable. If more incompatible changes should be reverted, I suggest to open 
new issues.

--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 942f7a2dea2e95a0fa848329565c0d0288d92e47 by Victor Stinner in 
branch 'master':
bpo-39674: Revert "bpo-37330: open() no longer accept 'U' in file mode 
(GH-16959)" (GH-18767)
https://github.com/python/cpython/commit/942f7a2dea2e95a0fa848329565c0d0288d92e47


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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

STINNER Victor  added the comment:


New changeset a6d3546d003d9873de0f71b319ad79d203374bf0 by Victor Stinner in 
branch 'master':
bpo-39674: Fix typo in What's New In Python 3.9 (GH-18776)
https://github.com/python/cpython/commit/a6d3546d003d9873de0f71b319ad79d203374bf0


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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

Change by STINNER Victor :


--
pull_requests: +18133
pull_request: https://github.com/python/cpython/pull/18776

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 116fd4af7370706d0d99ac7c70541ef965672d4e by Victor Stinner in 
branch 'master':
bpo-39674: Suggest to test with DeprecationWarning (GH-18552)
https://github.com/python/cpython/commit/116fd4af7370706d0d99ac7c70541ef965672d4e


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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 91fe4142642286b65c166f7b6e27de16f42b1286 by Victor Stinner in 
branch 'master':
bpo-39674: Update collections ABC deprecation doc (GH-18747)
https://github.com/python/cpython/commit/91fe4142642286b65c166f7b6e27de16f42b1286


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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 2aa694dd55202eb6d062fdf49c07cf95f8520f2d by Victor Stinner in 
branch '3.8':
bpo-39674: Update collections ABC deprecation doc (GH-18748)
https://github.com/python/cpython/commit/2aa694dd55202eb6d062fdf49c07cf95f8520f2d


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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

Change by STINNER Victor :


--
pull_requests: +18124
pull_request: https://github.com/python/cpython/pull/18767

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

STINNER Victor  added the comment:

Another candidate is to revert the ignored "U" mode in open(): commit 
e471e72977c83664f13d041c78549140c86c92de of bpo-37330.

Removing "U" mode of open() broke 11 packages in Fedora:

* aubio
* openvswitch
* python-SALib
* python-altgraph
* python-apsw
* python-magic-wormhole-mailbox-server
* python-munch
* python-parameterized
* python-pylibmc
* python-sphinx-testing
* veusz

Keeping "U" mode in Python 3.9 is also a formal request from Andrew Bartlett of 
the Samba project: https://bugs.python.org/issue37330#msg362362

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

STINNER Victor  added the comment:

Andrew Bartlett of the Samba project asked to revert the removal of the "U" 
mode:
https://bugs.python.org/issue37330#msg362362

We should consider to revert the removal, and only remove the "U" mode in 
Python 3.10.

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

Change by STINNER Victor :


--
pull_requests: +18103
pull_request: https://github.com/python/cpython/pull/18748

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

Change by STINNER Victor :


--
pull_requests: +18102
pull_request: https://github.com/python/cpython/pull/18747

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

STINNER Victor  added the comment:

PR 18552 adds a section to What's New In Python 3.9 to strongly advice to check 
for DeprecationWarning in your Python projects.

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

Change by STINNER Victor :


--
pull_requests: +17933
pull_request: https://github.com/python/cpython/pull/18552

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

STINNER Victor  added the comment:


New changeset af5ee3ff610377ef446c2d88bbfcbb3dffaaf0c9 by Victor Stinner in 
branch 'master':
bpo-39674: Revert "bpo-25988: Do not expose abstract collection classes in the 
collections module. (GH-10596)" (GH-18545)
https://github.com/python/cpython/commit/af5ee3ff610377ef446c2d88bbfcbb3dffaaf0c9


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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[Guido van Rossum]

Guido van Rossum  added the comment:

Yes please.

I have one exception. I f we manage to get the new parser (pegen) in, we have 
to remove the old parser module.

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nosy: +gvanrossum

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[Jason Madden]

Change by Jason Madden :


--
nosy: +jmadden

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

Change by STINNER Victor :


--
keywords: +patch
pull_requests: +17922
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18545

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


--
nosy: +xtreak

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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

New submission from STINNER Victor :

Following discussion on python-dev, I propose to revert the removal of a few 
deprecated functions to keep them in Python 3.9, and only remove them in Python 
3.10. Please see the following email for the longer rationale, and the 
discussion for further details:

https://mail.python.org/archives/list/python-...@python.org/thread/EYLXCGGJOUMZSE5X35ILW3UNTJM3MCRE/

With Python 3.8, it was possible to have a single code base working on Python 
2.7 and 3.8. Some functions emits DeprecationWarning, but these warnings are 
ignored (silent) by default. With removed deprecated functions in Python 3.9, 
*new* code is required to support Python 2.7. The problem is that Python 2.7 is 
no longer supported. Adding new code to support Python 2.7 sounds painful. 
Dropping Python 2.7 support isn't free. Projects have to drop Python 2 code, 
drop CI tests on Python 2, warn users, etc.

The idea is to give maintainers one more year (until Python 3.10) to organize 
their project to schedule properly the removal of Python 2 support. The first 
motivation is to ease adoption of Python 3.9.

--

I propose to start with reverting the removal of collections aliases to 
Abstract Base Classes (ABC) like collections.Mapping alias to 
collections.abc.Mapping. Removing these aliases is the change which caused most 
issues when testing Python projects on Python 3.9.

I also propose to modify the What's New In Python 3.9 document to strongly 
suggest to test your applications with -W default or even -W error to see 
DeprecationWarning and PendingDeprecationWarning.

--
components: Library (Lib)
messages: 362196
nosy: vstinner
priority: normal
severity: normal
status: open
title: Keep deprecated features in Python 3.9 to ease migration from Python 
2.7, but remove in Python 3.10
versions: Python 3.9

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