Fix CI for python package

.github/workflows/test_pip.yml

@@ -64,26 +64,20 @@ jobs:
         with:
           submodules: recursive
 
-      - name: Update pip and setup venv
+      - name: Setup venv
         run: |
-          python3 -m pip install --upgrade pip
           python3 -m venv ~/env
 
       - name: Build and install ghex
         run: |
           . ~/env/bin/activate
+          python3 -m pip install --upgrade pip
+          python3 -m pip install -r ./bindings/python/requirements-test.txt # before ghex installation to avoid mpi4py version conflict
           python3 -m pip install -v ./bindings/python
 
-      - if: ${{ matrix.config.run == 'ON' }}
-        name: Install pytest etc
-        run: |
-          . ~/env/bin/activate
-          python3 -m pip install -r ./bindings/python/requirements-test.txt
-
       - if: ${{ matrix.config.run == 'ON' }}
         name: Run Python tests
         run: |
           . ~/env/bin/activate
           python3 -m pytest -s ./test/bindings/python/
           mpirun --oversubscribe -np 4 python3 -m pytest -s --with-mpi ./test/bindings/python/
-

bindings/python/requirements-test.txt

@@ -5,7 +5,7 @@
 #    pip-compile --annotation-style=line --extra=test --output-file=requirements-test.txt pyproject.toml
 #
 iniconfig==2.0.0          # via pytest
-mpi4py==3.1.5             # via ghex (pyproject.toml)
+mpi4py==4.0.1             # via ghex (pyproject.toml)
 numpy==1.26.2             # via ghex (pyproject.toml)
 packaging==23.2           # via pytest
 pluggy==1.3.0             # via pytest