🐍 Drop Python 3.9

.github/workflows/tests.yml

@@ -36,7 +36,7 @@ jobs:
     name: Tests
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
       fail-fast: false
     runs-on:
       group: aws-g4dn-2xlarge

setup.cfg

@@ -16,15 +16,15 @@ classifiers =
     Natural Language :: English
     Operating System :: OS Independent
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
     Programming Language :: Python :: 3.12
     Programming Language :: Python :: 3.13
+    Programming Language :: Python :: 3.14
 
 [options]
 packages = find_namespace:
-python_requires = >=3.9
+python_requires = >=3.10
 include_package_data = True
 install_requires =
     accelerate>=1.4.0

tests/test_cli.py

@@ -14,7 +14,6 @@
 
 
 import os
-import sys
 import unittest
 from io import StringIO
 from unittest.mock import patch
@@ -24,11 +23,6 @@
 from .testing_utils import TrlTestCase
 
 
-@unittest.skipIf(
-    sys.version_info < (3, 10),
-    "Transformers' generation codebase uses a Python >3.10 syntax (`str | None`), which seems to cause the CLI tests "
-    "to fail on Python <3.10.",  # let's say it's a known issue, but not expected to be fixed, because too niche
-)
 class TestCLI(TrlTestCase):
     def test_dpo(self):
         from trl.cli import main