Drop Python 3.9 support after EoL (#1002)

* Drop Python 3.9 support after EoL

Update classifiers, python_requires, CI workflows, tox envs, and release notes to require Python 3.10+

* Update main.yml

* Update .github/workflows/main.yml

* Changes done

I have applied all the suggestions, and 3.10 is now consistently quoted in the workflows.

* More changes done

config references from Python 3.9 to 3.10.

---------

Co-authored-by: Edoardo Altamura <38359901+edoaltamura@users.noreply.github.com>

Author: shalini9894

.github/actions/run-tests/action.yml

@@ -36,7 +36,7 @@ runs:
         if [ "${{ inputs.event-name }}" == "schedule" ] || [ "${{ inputs.run-slow }}" == "true" ]; then
           export QISKIT_TESTS="run_slow"
         fi
-        if [ "${{ inputs.os }}" == "ubuntu-latest" ] && [ "${{ inputs.python-version }}" == "3.9" ]; then
+        if [ "${{ inputs.os }}" == "ubuntu-latest" ] && [ "${{ inputs.python-version }}" == "3.10" ]; then
           export PYTHON="coverage3 run --source qiskit_machine_learning --parallel-mode"
         fi
         stestr --test-path test run 2> >(tee /dev/stderr out.txt > /dev/null)

.github/workflows/deploy-code.yml

@@ -25,7 +25,7 @@ jobs:
       id-token: write
     strategy:
       matrix:
-        python-version: [3.9]
+        python-version: ['3.10']
     steps:
       - uses: actions/checkout@v6
       - uses: actions/setup-python@v6

.github/workflows/main.yml

@@ -35,7 +35,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.9]
+        python-version: ['3.10']
     steps:
       - name: Print Concurrency Group
         env:
@@ -112,15 +112,15 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.9, '3.10', 3.11, 3.12, 3.13]
+        python-version: ['3.10', 3.11, 3.12, 3.13]
         include:
           # macos-latest is an Arm64 image
           - os: macos-latest
-            python-version: 3.9
+            python-version: '3.10'
           - os: macos-latest
             python-version: 3.13
           - os: windows-latest
-            python-version: 3.9
+            python-version: '3.10'
           - os: windows-latest
             python-version: 3.13
     steps:
@@ -161,7 +161,7 @@ jobs:
         run: |
           coverage3 combine
           mv .coverage ./ci-artifact-data/ml.dat
-        if: ${{ matrix.os == 'ubuntu-latest' && matrix.python-version == 3.9 }}
+        if: ${{ matrix.os == 'ubuntu-latest' && matrix.python-version == '3.10' }}
         shell: bash
       - uses: actions/upload-artifact@v5
         with:
@@ -184,7 +184,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.9, 3.13]
+        python-version: ['3.10', 3.13]
     steps:
       - uses: actions/checkout@v6
         with:
@@ -247,29 +247,25 @@ jobs:
           cd docs/_build/html
           mkdir artifacts
           tar -zcvf artifacts/tutorials.tar.gz --exclude=./artifacts .
-        if: ${{ matrix.python-version == 3.9 && !startsWith(github.ref, 'refs/heads/stable') && !startsWith(github.base_ref, 'stable/') }}
+        if: ${{ matrix.python-version == '3.10' && !startsWith(github.ref, 'refs/heads/stable') && !startsWith(github.base_ref, 'stable/') }}
         shell: bash
       - name: Run upload stable tutorials
         uses: actions/upload-artifact@v5
         with:
           name: tutorials-stable${{ matrix.python-version }}
           path: docs/_build/html/artifacts/tutorials.tar.gz
-        if: ${{ matrix.python-version == 3.9 && !startsWith(github.ref, 'refs/heads/stable') && !startsWith(github.base_ref, 'stable/') }}
+        if: ${{ matrix.python-version == '3.10' && !startsWith(github.ref, 'refs/heads/stable') && !startsWith(github.base_ref, 'stable/') }}
   Deprecation_Messages_and_Coverage:
     needs: [Checks, MachineLearning, Tutorials]
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.9]
+        python-version: ['3.10']
     steps:
       - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
-      - uses: actions/download-artifact@v6
-        with:
-          name: ubuntu-latest-3.9
-          path: /tmp/u39
       - uses: actions/download-artifact@v6
         with:
           name: ubuntu-latest-3.10
@@ -288,32 +284,28 @@ jobs:
           path: /tmp/u313
       - uses: actions/download-artifact@v6
         with:
-          name: macos-latest-3.9
-          path: /tmp/m39
+          name: macos-latest-3.10
+          path: /tmp/m310
       - uses: actions/download-artifact@v6
         with:
           name: macos-latest-3.13
           path: /tmp/m313
       - uses: actions/download-artifact@v6
         with:
-          name: windows-latest-3.9
-          path: /tmp/w39
+          name: windows-latest-3.10
+          path: /tmp/w310
       - uses: actions/download-artifact@v6
         with:
           name: windows-latest-3.13
           path: /tmp/w313
+
       - name: Install Dependencies
         run: pip install -U coverage coveralls diff-cover
         shell: bash
       - name: Combined Deprecation Messages
         run: |
-          sort -f -u /tmp/u39/ml.dep /tmp/u310/ml.dep /tmp/u311/ml.dep /tmp/u312/ml.dep /tmp/u313/ml.dep /tmp/m39/ml.dep /tmp/m313/ml.dep /tmp/w39/ml.dep /tmp/w313/ml.dep || true
+          sort -f -u /tmp/u310/ml.dep /tmp/u311/ml.dep /tmp/u312/ml.dep /tmp/u313/ml.dep /tmp/m310/ml.dep /tmp/m313/ml.dep /tmp/w310/ml.dep /tmp/w313/ml.dep || true
         shell: bash
       - name: Coverage combine
-        run: coverage3 combine /tmp/u39/ml.dat
-        shell: bash
-      - name: Upload to Coveralls
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: coveralls --service=github
-        shell: bash
+        run: coverage3 combine /tmp/u310/ml.dat
+        shell: bash

.mergify.yml

@@ -1,12 +1,12 @@
 queue_rules:
   - name: automerge
     queue_conditions:
-      - check-success=Deprecation_Messages_and_Coverage (3.9)
+      - check-success=Deprecation_Messages_and_Coverage (3.10)
       - "#approved-reviews-by>=1"
       - label=automerge
       - label!=on hold
     merge_conditions:
-      - check-success=Deprecation_Messages_and_Coverage (3.9)
+      - check-success=Deprecation_Messages_and_Coverage (3.10)
     merge_method: squash
 
 pull_request_rules:

pyproject.toml

@@ -13,7 +13,7 @@ extension-pkg-allow-list = [
     "rustworkx",
 ]
 load-plugins = ["pylint.extensions.docparams", "pylint.extensions.docstyle"]
-py-version = "3.9"  # update it when bumping minimum supported python version
+py-version = "3.10"  # update it when bumping minimum supported python version
 
 [tool.pylint.basic]
 good-names = ["a", "b", "i", "j", "k", "d", "n", "m", "ex", "v", "w", "x", "y", "z", "Run", "_", "logger", "q", "c", "r", "qr", "cr", "qc", "nd", "pi", "op", "b", "ar", "br", "p", "cp", "ax", "dt", "__unittest", "iSwapGate", "mu"]

releasenotes/drop-python-39-eol-991-2025.yaml

@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Qiskit Machine Learning no longer supports Python 3.9, following its
+    EoL in October 2025. The minimum required Python
+    version is now 3.10.

setup.py

@@ -61,7 +61,6 @@
         "Operating System :: MacOS",
         "Operating System :: POSIX :: Linux",
         "Programming Language :: Python :: 3 :: Only",
-        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
@@ -74,7 +73,7 @@
     ),
     install_requires=REQUIREMENTS,
     include_package_data=True,
-    python_requires=">=3.9",
+    python_requires=">=3.10",
     extras_require={
         "torch": ["torch"],
         "sparse": ["sparse"],

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 # Sets this min.version because of differences with env_tmp_dir env.
 minversion = 4.0.2
-envlist = py39, py310, py311, py312, py313, lint, gpu, gpu-amd
+envlist = py310, py311, py312, py313, lint, gpu, gpu-amd
 skipsdist = True
 
 [testenv]