Fix build and tests

.github/workflows/tests.yml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.8, 3.9]
+        python-version: ['3.10', '3.11']
 
     env:
       USE_TRILINOS: 1
@@ -17,18 +17,19 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Install Linux packages ZOLTAN support
         run: |
           sudo apt-get update
           sudo apt-get install -y openmpi-bin libopenmpi-dev libtrilinos-zoltan-dev
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip wheel
+          python -m pip install --upgrade pip setuptools wheel
+          python -m pip install numpy 'cython<3.0'
           python -m pip install -r requirements.txt
           python setup.py develop
       - name: Run tests

pyzoltan/core/zoltan_comm.pyx

@@ -22,7 +22,7 @@ import numpy as np
 cimport numpy as np
 
 # Zoltan error checking
-from zoltan cimport _check_error
+from pyzoltan.core.zoltan cimport _check_error
 
 cdef class ZComm:
     """Wrapper for simplified unstructured point-to-point communication

pyzoltan/core/zoltan_dd.pyx

@@ -1,5 +1,5 @@
 """Example for the Zoltan Distributed data directory"""
-from zoltan cimport _check_error
+from pyzoltan.core.zoltan cimport _check_error
 
 cdef class Zoltan_DD:
     """A Zoltan Distributed data directory is used as a parallel hash map.

requirements.txt

@@ -1,5 +1,5 @@
 cyarray
-Cython>=0.20
+Cython<3.0
 setuptools>=6.0
 numpy
 pytest

setup.py

@@ -341,7 +341,7 @@ def setup_package():
 
     # The requirements.
     install_requires = [
-        'cyarray', 'numpy', 'Cython>=0.20', 'setuptools>=6.0', 'mpi4py>=1.2'
+        'cyarray', 'numpy', 'Cython<3.0', 'setuptools>=6.0', 'mpi4py>=1.2'
     ]
     tests_require = ["pytest>=3.0"]
     docs_require = ["sphinx"]