Install python using action and use that

Author: varunagrawal

.github/workflows/python_ci.yml

@@ -11,9 +11,6 @@ jobs:
       CTEST_OUTPUT_ON_FAILURE: ON
       CTEST_PARALLEL_LEVEL: 2
       CMAKE_BUILD_TYPE: ${{ matrix.build_type }}
-      PYTHON_VERSION: ${{ matrix.python_version }}
-      VENV_PATH: ${{ github.workspace }}/venv
-      VENV_PYTHON_EXECUTABLE: ${{ github.workspace }}/venv/bin/python
 
     strategy:
       fail-fast: false
@@ -23,7 +20,7 @@ jobs:
         name: [ubuntu-22.04-gcc-9, ubuntu-22.04-clang-12, macos-14-xcode-15.4]
 
         build_type: [Debug, Release]
-        python_version: [3]
+        python_version: [3.11]
         include:
           - name: ubuntu-22.04-gcc-9
             os: ubuntu-22.04
@@ -41,6 +38,13 @@ jobs:
             version: "15.4"
 
     steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v6
+        with:
+          python-version: ${{ matrix.python_version }}
+
       - name: Install Dependencies (Linux)
         if: runner.os == 'Linux'
         run: |
@@ -76,14 +80,11 @@ jobs:
           brew install boost
           brew tap borglab/core
 
-      - name: Python Dependencies inside venv
+      - name: Python Dependencies
         shell: bash
         run: |
-          python${{ env.PYTHON_VERSION }} -m venv ${{ env.VENV_PATH }}
-          source ${{ env.VENV_PATH }}/bin/activate
-          echo "${{ env.VENV_PATH }}/bin" >> $GITHUB_PATH
-          ${{ env.VENV_PYTHON_EXECUTABLE }} -m pip install --upgrade pip
-          ${{ env.VENV_PYTHON_EXECUTABLE }} -m pip install -U "setuptools<70" wheel "numpy>=1.11.0" pyparsing pyyaml "pybind11-stubgen>=2.5.1"
+          pip install --upgrade pip
+          pip install -U "setuptools<70" wheel "numpy>=1.11.0" pyparsing pyyaml "pybind11-stubgen>=2.5.1"
 
       - name: Install GTSAM (Linux)
         if: runner.os == 'Linux'
@@ -94,7 +95,6 @@ jobs:
           cmake -DGTSAM_BUILD_EXAMPLES_ALWAYS=OFF \
                 -DGTSAM_BUILD_PYTHON=ON \
                 -DGTSAM_WITH_TBB=OFF \
-                -DPYTHON_EXECUTABLE=${{ env.VENV_PYTHON_EXECUTABLE }} \
                 ..
           sudo make -j4 install 
           make -j4 python-install 
@@ -111,29 +111,21 @@ jobs:
           cmake -DGTSAM_BUILD_EXAMPLES_ALWAYS=OFF \
                 -DGTSAM_BUILD_PYTHON=ON \
                 -DGTSAM_WITH_TBB=OFF \
-                -DPYTHON_EXECUTABLE=${{ env.VENV_PYTHON_EXECUTABLE }} \
                 ..
           sudo make -j4 install 
           make -j4 python-install 
           cd ${{ github.workspace }} # go back to home directory
           sudo rm -rf /tmp/gtsam_source
 
-      - name: Checkout
-        uses: actions/checkout@v4
-
       - name: Build Directory
         run: mkdir build
 
       - name: Configure
         run: |
           cmake -DGPMP2_BUILD_PYTHON_TOOLBOX=ON \
-                -DPYTHON_EXECUTABLE=${{ env.VENV_PYTHON_EXECUTABLE }} \
                 ..
         working-directory: ./build
 
-      - name: Setup tmate session
-        uses: mxschmitt/action-tmate@v3
-
       - name: Build
         run: make -j4
         working-directory: ./build