Drop python 3.8 support

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

@@ -40,7 +40,7 @@ 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 }}" == "3.8" ]; then
+        if [ "${{ inputs.os }}" == "ubuntu-latest" ] && [ "${{ inputs.python-version }}" == "3.9" ]; then
           export PYTHON="coverage3 run --source qiskit_optimization --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: [3.8]
+        python-version: [3.9]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5

.github/workflows/deploy-docs.yml

@@ -26,7 +26,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.8]
+        python-version: [3.9]
     steps:
       - uses: actions/checkout@v4
         with:

.github/workflows/main.yml

@@ -36,7 +36,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.8]
+        python-version: [3.9]
     steps:
       - name: Print Concurrency Group
         env:
@@ -119,14 +119,14 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.8, 3.9, '3.10', 3.11, 3.12]
+        python-version: [3.9, '3.10', 3.11, 3.12]
         include:
           - os: macos-latest
-            python-version: 3.8
+            python-version: 3.9
           - os: macos-latest
             python-version: 3.11
           - os: windows-latest
-            python-version: 3.8
+            python-version: 3.9
           - os: windows-latest
             python-version: 3.11
     steps:
@@ -197,7 +197,7 @@ jobs:
           fi
           coverage3 combine
           mv .coverage ./ci-artifact-data/opt.dat
-        if: ${{ matrix.os == 'ubuntu-latest' && matrix.python-version == 3.8 }}
+        if: ${{ matrix.os == 'ubuntu-latest' && matrix.python-version == 3.9 }}
         shell: bash
       - uses: actions/upload-artifact@v4
         with:
@@ -225,7 +225,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.8, 3.11]
+        python-version: [3.9, 3.11]
     steps:
       - uses: actions/checkout@v4
         with:
@@ -290,30 +290,26 @@ jobs:
           cd docs/_build/html
           mkdir artifacts
           tar -zcvf artifacts/tutorials.tar.gz --exclude=./artifacts .
-        if: ${{ matrix.python-version == 3.8 && !startsWith(github.ref, 'refs/heads/stable') && !startsWith(github.base_ref, 'stable/') }}
+        if: ${{ matrix.python-version == 3.9 && !startsWith(github.ref, 'refs/heads/stable') && !startsWith(github.base_ref, 'stable/') }}
         shell: bash
       - name: Run upload stable tutorials
         uses: actions/upload-artifact@v4
         with:
           name: tutorials-stable${{ matrix.python-version }}
           path: docs/_build/html/artifacts/tutorials.tar.gz
-        if: ${{ matrix.python-version == 3.8 && !startsWith(github.ref, 'refs/heads/stable') && !startsWith(github.base_ref, 'stable/') }}
+        if: ${{ matrix.python-version == 3.9 && !startsWith(github.ref, 'refs/heads/stable') && !startsWith(github.base_ref, 'stable/') }}
   Deprecation_Messages_and_Coverage:
     if: github.repository_owner == 'qiskit-community'
     needs: [Checks, Optimization, Tutorials]
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8]
+        python-version: [3.9]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-      - uses: actions/download-artifact@v4
-        with:
-          name: ubuntu-latest-3.8
-          path: /tmp/o38
       - uses: actions/download-artifact@v4
         with:
           name: ubuntu-latest-3.9
@@ -332,16 +328,16 @@ jobs:
           path: /tmp/o312
       - uses: actions/download-artifact@v4
         with:
-          name: macos-latest-3.8
-          path: /tmp/m38
+          name: macos-latest-3.9
+          path: /tmp/m39
       - uses: actions/download-artifact@v4
         with:
           name: macos-latest-3.11
           path: /tmp/m311
       - uses: actions/download-artifact@v4
         with:
-          name: windows-latest-3.8
-          path: /tmp/w38
+          name: windows-latest-3.9
+          path: /tmp/w39
       - uses: actions/download-artifact@v4
         with:
           name: windows-latest-3.11
@@ -351,10 +347,10 @@ jobs:
         shell: bash
       - name: Combined Deprecation Messages
         run: |
-          sort -f -u /tmp/o38/opt.dep /tmp/o39/opt.dep /tmp/o310/opt.dep /tmp/o311/opt.dep /tmp/o312/opt.dep /tmp/m38/opt.dep /tmp/m311/opt.dep /tmp/w38/opt.dep /tmp/w311/opt.dep || true
+          sort -f -u /tmp/o39/opt.dep /tmp/o310/opt.dep /tmp/o311/opt.dep /tmp/o312/opt.dep /tmp/m39/opt.dep /tmp/m311/opt.dep /tmp/w39/opt.dep /tmp/w311/opt.dep || true
         shell: bash
       - name: Coverage combine
-        run: coverage3 combine /tmp/o38/opt.dat
+        run: coverage3 combine /tmp/o39/opt.dat
         shell: bash
       - name: Upload to Coveralls
         env:

pyproject.toml

@@ -4,4 +4,4 @@ build-backend = "setuptools.build_meta"
 
 [tool.black]
 line-length = 100
-target-version = ['py38', 'py39', 'py310', 'py311']
+target-version = ['py39', 'py310', 'py311', 'py312']

qiskit_optimization/algorithms/optimization_algorithm.py

@@ -131,7 +131,9 @@ def __init__(  # pylint: disable=too-many-positional-arguments
                     f"variables: size {len(variables)} {[v.name for v in variables]}"
                 )
             self._x = np.asarray(x)
-            self._variables_dict = dict(zip(self._variable_names, self._x))
+            self._variables_dict = {
+                name: val.item() for name, val in zip(self._variable_names, self._x)
+            }
 
         self._fval = fval
         self._raw_results = raw_results

setup.py

@@ -61,7 +61,6 @@
         "Operating System :: MacOS",
         "Operating System :: POSIX :: Linux",
         "Programming Language :: Python :: 3 :: Only",
-        "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
@@ -72,7 +71,7 @@
     packages=setuptools.find_packages(include=["qiskit_optimization", "qiskit_optimization.*"]),
     install_requires=REQUIREMENTS,
     include_package_data=True,
-    python_requires=">=3.8",
+    python_requires=">=3.9",
     extras_require={
         "cplex": ["cplex; python_version < '3.12' and platform_machine != 'arm64'"],
         "cvx": ["cvxpy"],

test/problems/test_quadratic_program.py

@@ -1,6 +1,6 @@
 # This code is part of a Qiskit project.
 #
-# (C) Copyright IBM 2020, 2023.
+# (C) Copyright IBM 2020, 2024.
 #
 # This code is licensed under the Apache License, Version 2.0. You may
 # obtain a copy of this license in the LICENSE.txt file in the root directory
@@ -857,18 +857,20 @@ def test_write_to_lp_file(self):
         with tempfile.TemporaryDirectory() as tmp:
             temp_output_path = path.join(tmp, "temp.lp")
             q_p.write_to_lp_file(temp_output_path)
-            with open(reference_file_name, encoding="utf8") as reference, open(
-                temp_output_path, encoding="utf8"
-            ) as temp_output_file:
+            with (
+                open(reference_file_name, encoding="utf8") as reference,
+                open(temp_output_path, encoding="utf8") as temp_output_file,
+            ):
                 lines1 = temp_output_file.readlines()
                 lines2 = reference.readlines()
                 self.assertListEqual(lines1, lines2)
 
         with tempfile.TemporaryDirectory() as temp_problem_dir:
             q_p.write_to_lp_file(temp_problem_dir)
-            with open(path.join(temp_problem_dir, "my_problem.lp"), encoding="utf8") as file1, open(
-                reference_file_name, encoding="utf8"
-            ) as file2:
+            with (
+                open(path.join(temp_problem_dir, "my_problem.lp"), encoding="utf8") as file1,
+                open(reference_file_name, encoding="utf8") as file2,
+            ):
                 lines1 = file1.readlines()
                 lines2 = file2.readlines()
                 self.assertListEqual(lines1, lines2)

test/translators/test_prettyprint.py

@@ -1,6 +1,6 @@
 # This code is part of a Qiskit project.
 #
-# (C) Copyright IBM 2022, 2023.
+# (C) Copyright IBM 2022, 2024.
 #
 # This code is licensed under the Apache License, Version 2.0. You may
 # obtain a copy of this license in the LICENSE.txt file in the root directory
@@ -495,43 +495,49 @@ def test_error(self):
             q_p = QuadraticProgram(name)
             _ = q_p.prettyprint()
 
-        with self.subTest("linear variable name - func"), self.assertRaises(
-            QiskitOptimizationError
+        with (
+            self.subTest("linear variable name - func"),
+            self.assertRaises(QiskitOptimizationError),
         ):
             q_p = QuadraticProgram()
             q_p.binary_var(name)
             _ = prettyprint(q_p)
 
-        with self.subTest("linear variable name - meth"), self.assertRaises(
-            QiskitOptimizationError
+        with (
+            self.subTest("linear variable name - meth"),
+            self.assertRaises(QiskitOptimizationError),
         ):
             q_p = QuadraticProgram()
             q_p.binary_var(name)
             _ = q_p.prettyprint()
 
-        with self.subTest("linear constraint name - func"), self.assertRaises(
-            QiskitOptimizationError
+        with (
+            self.subTest("linear constraint name - func"),
+            self.assertRaises(QiskitOptimizationError),
         ):
             q_p = QuadraticProgram()
             q_p.linear_constraint(name=name)
             _ = prettyprint(q_p)
 
-        with self.subTest("linear constraint name - meth"), self.assertRaises(
-            QiskitOptimizationError
+        with (
+            self.subTest("linear constraint name - meth"),
+            self.assertRaises(QiskitOptimizationError),
         ):
             q_p = QuadraticProgram()
             q_p.linear_constraint(name=name)
             _ = q_p.prettyprint()
 
-        with self.subTest("quadratic constraint name - func"), self.assertRaises(
-            QiskitOptimizationError
+        with (
+            self.subTest("quadratic constraint name - func"),
+            self.assertRaises(QiskitOptimizationError),
         ):
             q_p = QuadraticProgram()
             q_p.quadratic_constraint(name=name)
             _ = prettyprint(q_p)
 
-        with self.subTest("quadratic constraint name - meth"), self.assertRaises(
-            QiskitOptimizationError
+        with (
+            self.subTest("quadratic constraint name - meth"),
+            self.assertRaises(QiskitOptimizationError),
         ):
             q_p = QuadraticProgram()
             q_p.quadratic_constraint(name=name)

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 3.3.0
-envlist = py38, py39, py310, py311, py312, lint
+envlist = py39, py310, py311, py312, lint
 skipsdist = True
 
 [testenv]