Description

assignee = None
closed_at = None
created_at = <Date 2022-02-19.08:29:16.968>
labels = ['library', '3.11']
title = 'ast.Constant.n deprecated without warning'
updated_at = <Date 2022-02-19.12:24:07.912>
user = 'https://github.com/jwilk'

activity = <Date 2022-02-19.12:24:07.912>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2022-02-19.08:29:16.968>
creator = 'jwilk'
dependencies = []
files = []
hgrepos = []
issue_num = 46797
keywords = ['patch']
message_count = 2.0
messages = ['413541', '413546']
nosy_count = 2.0
nosy_names = ['jwilk', 'serhiy.storchaka']
pr_nums = ['31432']
priority = 'low'
resolution = 'postponed'
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue46797'
versions = ['Python 3.11']

Activity

1. jwilk commented on Feb 19, 2022

   

   jwilkmannequin

   on Feb 19, 2022

   MannequinAuthor

   More actions

   ast.Constant.n is documented to be deprecated, but you don't get any warning when you use it:

   $ python3.11 -Wd
   Python 3.11.0a5 (main, Feb 12 2022, 17:11:59) [GCC 9.3.0] on linux
   Type "help", "copyright", "credits" or "license" for more information.
   >>> import ast
   >>> help(ast.Constant.n)
   Help on property:

   Deprecated. Use value instead.
   

   >>> ast.Constant(value=42).n
   42
2. jwilk

   added

   3.11only security fixesonly security fixes

   stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

   on Feb 19, 2022
3. serhiy-storchaka commented on Feb 19, 2022

   

   serhiy-storchaka

   on Feb 19, 2022

   Member

   More actions

   It is because we did not have a plan for removing deprecates features. Deprecation in documentation only helps third-party code. Instead of adding a complex code which switches between using old and new names depending on Python version, the third-party code can continue to use old names without worring about deprecation warnings, and switch completely to using new features only when support of old Python versions be dropped. 3.7 and 3.8 are not so old and may be still supported in third-party code.

   I have created a PR which adds deprecation warnings, but I am not sure that it is worth to include it in 3.11.
4. ezio-melotti

   transferred this issue fromon Apr 10, 2022
5. AlexWaygood

   added a commit that references this issue on May 6, 2023

   gh-90953: Emit deprecation warnings for `ast` features deprecated in …

   376137f
6. jbower-fb

   added a commit that references this issue on May 8, 2023

   pythongh-90953: Emit deprecation warnings for `ast` features deprecat…

   1173ce2
7. AlexWaygood

   added 2 commits that reference this issue on May 9, 2023

   pythongh-90953: Don't use deprecated AST nodes in clinic.py

   d8d0ae6

   gh-90953: Don't use deprecated AST nodes in clinic.py (#104322)

   fe694a6
8. carljm

   added a commit that references this issue on May 10, 2023

   Merge branch 'main' into fixloadsuperspec

   5976df9
9. hugovk commented on Jan 11, 2024

   

   hugovk

   on Jan 11, 2024

   Member

   More actions

   A deprecation warning is now raised:

   Python 3.12.1 (v3.12.1:2305ca5144, Dec  7 2023, 17:23:38) [Clang 13.0.0 (clang-1300.0.29.30)] on darwin
   Type "help", "copyright", "credits" or "license" for more information.
   >>> import ast
   >>> help(ast.Constant.n)
   Help on property:
   
       Deprecated. Use value instead.
   
   >>> ast.Constant(value=42).n
   <stdin>:1: DeprecationWarning: Attribute n is deprecated and will be removed in Python 3.14; use value instead
   42
10. hugovk

    closed this as completedon Jan 11, 2024
11. bnebgen-LANL

    added a commit that references this issue on May 30, 2024

    Replace `ast.Num` with `ast.Constant`

    28b0ade
12. miss-islington

    added 3 commits that reference this issue on Oct 31, 2025

    pythongh-90953: Don't use deprecated AST nodes in clinic.py (pythonGH…

    eaf62ab

    pythongh-90953: Don't use deprecated AST nodes in clinic.py (pythonGH…

    e8cd18d

    pythongh-90953: Don't use deprecated AST nodes in clinic.py (pythonGH…

    1e8f2e7
13. ambv

    added 3 commits that reference this issue on Oct 31, 2025

    [3.10] gh-90953: Don't use deprecated AST nodes in clinic.py (GH-104322…

    9524203

    [3.9] gh-90953: Don't use deprecated AST nodes in clinic.py (GH-104322)…

    fde6ac1

    [3.11] gh-90953: Don't use deprecated AST nodes in clinic.py (GH-104322…

    20fe182

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