Drop support for Python 3.9

.github/workflows/build-with-clang.yml

@@ -13,8 +13,8 @@ jobs:
 
     strategy:
       matrix:
-        python: ["3.9", "3.10", "3.11", "3.12", "3.13"]
-        numpy_version: ["numpy'<2'", "numpy'>=2'"]
+        python: ["3.10", "3.11", "3.12", "3.13"]
+        numpy_version: ["numpy'>=2'"]
 
     env:
       ONEAPI_ROOT: /opt/intel/oneapi

.github/workflows/build_pip.yaml

@@ -22,7 +22,7 @@ jobs:
 
     strategy:
       matrix:
-        python: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python: ['3.10', '3.11', '3.12', '3.13']
         use_pre: ["", "--pre"]
 
     steps:

.github/workflows/conda-package-cf.yml

@@ -21,8 +21,6 @@ jobs:
     strategy:
       matrix:
         include:
-          - python: '3.9'
-            numpy: '2.0'
           - python: '3.10'
             numpy: '2.2'
           - python: '3.11'
@@ -87,7 +85,7 @@ jobs:
 
     strategy:
       matrix:
-        python_ver: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python_ver: ['3.10', '3.11', '3.12', '3.13']
         numpy: ['numpy">=2"']
         experimental: [false]
         runner: [ubuntu-latest]
@@ -158,8 +156,6 @@ jobs:
     strategy:
       matrix:
         include:
-          - python: '3.9'
-            numpy: '2.0'
           - python: '3.10'
             numpy: '2.2'
           - python: '3.11'
@@ -229,7 +225,7 @@ jobs:
 
     strategy:
       matrix:
-        python_ver: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python_ver: ['3.10', '3.11', '3.12', '3.13']
         numpy: ['numpy">=2"']
         experimental: [false]
         runner: [windows-latest]

.github/workflows/conda-package.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python: ['3.10', '3.11', '3.12', '3.13']
     steps:
       - name: Cancel Previous Runs
         uses: styfle/cancel-workflow-action@85880fa0301c86cca9da44039ee3bb12d3bedbfa # 0.12.1
@@ -77,7 +77,7 @@ jobs:
 
     strategy:
       matrix:
-        python: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python: ['3.10', '3.11', '3.12', '3.13']
         experimental: [false]
         runner: [ubuntu-latest]
     continue-on-error: ${{ matrix.experimental }}
@@ -141,12 +141,7 @@ jobs:
         run: |
           CHANNELS="-c $GITHUB_WORKSPACE/channel ${{ env.CHANNELS }}"
           conda create -n ${{ env.TEST_ENV_NAME }} $PACKAGE_NAME=${{ env.PACKAGE_VERSION }} python=${{ matrix.python }} pytest $CHANNELS
-          if [[ "${{ matrix.python }}" != 3.9* ]]; then
-            # Intel channel only has scipy=1.10 for Python 3.9, which needs mkl<2025
-            # while scipy needs to install numpy and mkl_random and mkl_random-1.2.11 requires mkl>=2025
-            # so avoid installing scipy for Python 3.9 which means third_party/scipy tests will not run
-            conda install -n ${{ env.TEST_ENV_NAME }} "scipy>=1.10" $CHANNELS
-          fi
+          conda install -n ${{ env.TEST_ENV_NAME }} "scipy>=1.10" $CHANNELS
           # Test installed packages
           conda list -n ${{ env.TEST_ENV_NAME }}
 
@@ -161,7 +156,7 @@ jobs:
 
     strategy:
       matrix:
-        python: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python: ['3.10', '3.11', '3.12', '3.13']
     steps:
       - name: Cancel Previous Runs
         uses: styfle/cancel-workflow-action@85880fa0301c86cca9da44039ee3bb12d3bedbfa # 0.12.1
@@ -225,7 +220,7 @@ jobs:
 
     strategy:
       matrix:
-        python: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python: ['3.10', '3.11', '3.12', '3.13']
         experimental: [false]
         runner: [windows-latest]
     continue-on-error: ${{ matrix.experimental }}
@@ -315,10 +310,8 @@ jobs:
           )
           SET "TEST_DEPENDENCIES=pytest"
           conda install -n ${{ env.TEST_ENV_NAME }} ${{ env.PACKAGE_NAME }}=%PACKAGE_VERSION% %TEST_DEPENDENCIES% python=${{ matrix.python }} -c ${{ env.workdir }}/channel ${{ env.CHANNELS }}
-          if ("${{ matrix.python }}" -ne "3.9") {
-            conda install -n ${{ env.TEST_ENV_NAME }} scipy -c ${{ env.workdir }}/channel ${{ env.CHANNELS }}
+          conda install -n ${{ env.TEST_ENV_NAME }} scipy -c ${{ env.workdir }}/channel ${{ env.CHANNELS }}
           }
-
       - name: Report content of test environment
         shell: cmd /C CALL {0}
         run: |

CHANGELOG.md

@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [dev] - YYYY-MM-DD
+
+### Removed
+* Dropped support for Python 3.9 [gh-243](https://github.com/IntelPython/mkl_fft/pull/243)
+
 ## [2.1.1] - 2025-10-09
 
 ### Fixed

mkl_fft/tests/third_party/scipy/test_basic.py

@@ -17,10 +17,7 @@
 except ImportError:
     pytest.skip("This test file needs scipy", allow_module_level=True)
 else:
-    if np.lib.NumpyVersion(scipy.__version__) < "1.12.0":
-        # scipy from Intel channel is 1.10 with python 3.9 and 3.10
-        pytest.skip("This test file needs scipy>=1.12", allow_module_level=True)
-    elif np.lib.NumpyVersion(scipy.__version__) < "1.14.0":
+    if np.lib.NumpyVersion(scipy.__version__) < "1.14.0":
         # For python-3.11 and 3.12, scipy<1.14 is installed from Intel channel
         # For python<=3.9, scipy<1.14 is installed from conda channel
         # pylint: disable=no-name-in-module

pyproject.toml

@@ -38,7 +38,6 @@ classifiers = [
   "Programming Language :: C",
   "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",
@@ -57,7 +56,7 @@ keywords = ["DFTI", "FFT", "Fourier", "MKL"]
 license = "BSD-3-Clause"
 name = "mkl_fft"
 readme = {file = "README.md", content-type = "text/markdown"}
-requires-python = ">=3.9,<3.14"
+requires-python = ">=3.10,<3.14"
 
 [project.optional-dependencies]
 scipy_interface = ["scipy>=1.10"]