CI: Test on Python 3.12

Update requirements.txt to use binary files and pre-releases if
necessary.

Author: effigies

.github/workflows/test.yml

@@ -22,7 +22,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
         requires: ['requirements.txt']
         include:
           - python-version: '3.8'
@@ -35,6 +35,7 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
+        allow-prereleases: true
     - name: Install
       run: |
         python -m pip install --upgrade pip

min-requirements.txt

@@ -1,4 +1,6 @@
 # Auto-generated by tools/update_requirements.py
+--only-binary :all:
+--extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
 matplotlib==3.5
 numpy==1.22
 scipy==1.8

requirements.txt

@@ -1,4 +1,6 @@
 # Auto-generated by tools/update_requirements.py
+--only-binary :all:
+--extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
 matplotlib>=3.5
 numpy>=1.22
 scipy>=1.8

tools/update_requirements.py

@@ -19,12 +19,18 @@
 
 script_name = Path(__file__).relative_to(repo_root)
 
-lines = [f'# Auto-generated by {script_name}', '']
+lines = [
+    f'# Auto-generated by {script_name}',
+    '--only-binary :all:',
+    '--extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple',
+    '',
+]
+start = len(lines) - 1
 
 # Write requirements
-lines[1:-1] = requirements
+lines[start:-1] = requirements
 reqs.write_text('\n'.join(lines))
 
 # Write minimum requirements
-lines[1:-1] = [req.replace('>=', '==').replace('~=', '==') for req in requirements]
+lines[start:-1] = [req.replace('>=', '==').replace('~=', '==') for req in requirements]
 min_reqs.write_text('\n'.join(lines))