DeprecationWarning - python 3.14 #1035

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1. holymonson commented on Sep 17, 2025

   

   holymonson

   on Sep 17, 2025

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   2025-09-17T05:31:50.5143150Z     _string_type_nodes = (ast.Str, ast.Bytes)
   2025-09-17T05:31:50.5143337Z                           ^^^^^^^
   2025-09-17T05:31:50.5143517Z AttributeError: module 'ast' has no attribute 'Str'
   

   @sebastinas On python 3.14, it becomes a AttributeError rather than DeprecationWarning, may I ask if any plan on fixing it?
2. viadezo1er commented on Sep 19, 2025

   

   viadezo1er

   on Sep 19, 2025

   Last edited by viadezo1er

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   Debian 13.1
   Kernel: Linux 6.12.43+deb13-amd64
   Installed python3.14.0rc3 with pyenv:

   pyenv install 3.14.0rc3
   pyenv local 3.14.0rc3
   pip install bython
   bpython
   

   The error message is (just changed the path to hide my home):

   File "~/.pyenv/versions/3.14.0rc2/lib/python3.14/site-packages/bpython/simpleeval.py", line 36, in <module>
       _string_type_nodes = (ast.Str, ast.Bytes)
   
   AttributeError: module 'ast' has no attribute 'Str'
   

   Changing ast.Str and ast.Bytes to ast.Constant solves the error, and enables me to use bpython as usual.

   https://docs.python.org/3/library/ast.html for version 3.13.7:
   Deprecated since version 3.8: Old classes ast.Num, ast.Str, ast.Bytes, ast.NameConstant and ast.Ellipsis are still available, but they will be removed in future Python releases. In the meantime, instantiating them will return an instance of a different class.

   Since "a different class" was already used, it probably retains the same behavior with no unseen change.

   So the change needed to solve the issue seems minimal.
3. sebastinas

   self-assigned this

   on Sep 20, 2025
4. sebastinas

   added the

   Bug

   issue type on Sep 20, 2025
5. sebastinas

   added this to the release-0.26 milestone on Sep 20, 2025
6. sebastinas

   added a commit that references this issue on Sep 26, 2025

   Align simple_eval with Python 3.10+ (fices #1035)

   f1f6fc9
7. sebastinas

   closed this as completedin 064ae93on Sep 26, 2025
8. sthagen

   added a commit that references this issue on Sep 27, 2025

   Align simple_eval with Python 3.10+ (fixes bpython#1035)

   This issue will close once commit 064ae93 is merged into the 'main' branch.

   064ae93