Remove support for Python 3.9

Author: DanielNoord

.github/workflows/test.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:

docs/configuration/black_compatibility.md

@@ -33,7 +33,6 @@ A demo of how this would look like in your _.travis.yml_
 language: python
 python:
   - "3.10"
-  - "3.9"
 
 install:
   - pip install -r requirements-dev.txt

docs/contributing/1.-contributing-guide.md

@@ -14,7 +14,7 @@ Account Requirements:
 
 Base System Requirements:
 
-- Python3.9+
+- Python3.10+
 - uv
 - bash or a bash compatible shell (should be auto-installed on Linux / Mac)
   - WSL users running Ubuntu may need to install Python's venv module even after installing Python.

pyproject.toml

@@ -20,7 +20,6 @@ classifiers = [
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -37,15 +36,9 @@ include = [
     { path = "ACKNOWLEDGEMENTS.md", format = "sdist" },
     { path = "LICENSE", format = "sdist" },
 ]
-requires-python = ">=3.9.0"
-
-dependencies = [
-    # we only need the entry_points() function, which appeared in the stdlib
-    # in Python 3.10.
-    # importlib_metadata 4.6 is the version matching stdlib 3.10
-    # See grid at https://pypi.org/project/importlib-metadata/
-    "importlib_metadata >= 4.6.0; python_version < '3.10'",
-]
+requires-python = ">=3.10.0"
+
+dependencies = []
 
 [project.urls]
 Homepage = "https://pycqa.github.io/isort/index.html"
@@ -163,7 +156,7 @@ per-file-ignores = [
 ]
 
 [tool.mypy]
-python_version = 3.9
+python_version = "3.10"
 strict = true
 follow_imports = "silent"
 exclude = "isort/_vendored|tests/unit/example_projects|tests/unit/example_crlf_file.py"

scripts/docker.sh

@@ -3,7 +3,7 @@ set -ux
 
 result=0
 
-for ver in {3.9,3.10}; do
+for ver in {3.10,3.11,3.12,3.13,3.14}; do
 	# latest tag will override after each build, leaving only the newest python version tagged
 	docker build ./ --build-arg VERSION=$ver -t "isort:$ver" -t "isort:latest" && docker run "isort:$ver"
 	result=$(( $? + $result ))

tox.ini

@@ -4,7 +4,7 @@ env_list =
     # When updating the list of Python versions to test,
     # use search-and-replace to ensure that intra-environment
     # dependencies are maintained for parallel execution.
-    py{3.13, 3.12, 3.11, 3.10, 3.9}
+    py{3.14, 3.13, 3.12, 3.11, 3.10}
     coverage_report
     mypy
 
@@ -22,15 +22,15 @@ runner = uv-venv-lock-runner
 dependency_groups =
     dev
 depends =
-    py{3.13, 3.12, 3.11, 3.10, 3.9}: coverage_erase
+    py{3.14, 3.13, 3.12, 3.11, 3.10}: coverage_erase
 commands =
     coverage run -m pytest tests/unit/ -s --ignore=tests/unit/test_deprecated_finders.py
 
 
 [testenv:coverage_report{,-ci}]
 description = Create a coverage report
 depends =
-    py{3.13, 3.12, 3.11, 3.10, 3.9}
+    py{3.14, 3.13, 3.12, 3.11, 3.10}
 dependency_groups =
     dev
 commands_pre =
@@ -55,7 +55,7 @@ dependency_groups =
 commands =
     cruft check
     mypy -p isort -p tests
-    black --target-version py39 --check .
+    black --target-version py310 --check .
     isort --profile hug --check --diff isort/ tests/
     isort --profile hug --check --diff example_isort_formatting_plugin/
     isort --profile hug --check --diff example_isort_sorting_plugin/