Test types across environments (microsoft#375)

Author: Avasam

.github/workflows/test.yml

@@ -4,17 +4,25 @@ on: [push, pull_request, workflow_dispatch]
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     timeout-minutes: 10
+    strategy:
+      matrix:
+        # Oldest non-EOL and newest released
+        # scipy-stubs does not support Python 3.9
+        python-version: ["3.10", "3.13"]
+        # Tier 1 OSes
+        os: ["ubuntu-latest", "windows-latest", "macos-latest"]
+      fail-fast: false
 
     steps:
       - name: Check out code
         uses: actions/checkout@v2
 
-      - name: Setup Python
+      - name: Setup Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
         with:
-          python-version: "3.11"
+          python-version: ${{ matrix.python-version }}
 
       - name: Cache pip
         uses: actions/cache@v4
@@ -31,9 +39,10 @@ jobs:
         uses: jakebailey/pyright-action@v2
         with:
           pylance-version: latest-prerelease
+          python-version: ${{ matrix.python-version }}
 
       - name: Run mypy tests
-        run: python -m mypy .
+        run: python -m mypy . --python-version=${{ matrix.python-version }}
 
   hygiene:
     runs-on: ubuntu-latest
@@ -45,4 +54,5 @@ jobs:
 
       - name: Run Ruff Linter
         uses: astral-sh/ruff-action@v3
-      - run: ruff format --check
+      - name: Run Ruff Formatter
+        run: ruff format --check

stubs/matplotlib/_mathtext.pyi

@@ -1,11 +1,19 @@
 import enum
 import functools
-from tkinter.tix import HList
+import sys
+from _typeshed import Incomplete
 from typing import Literal
 
 from .font_manager import FontProperties
 from .mathtext import MathtextBackend
 
+# tkinter.tix was removed from Python 3.13
+# Recent matplotlib versions define HList in this module
+if sys.version_info >= (3, 13):
+    HList: Incomplete
+else:
+    from tkinter.tix import HList
+
 def get_unicode_index(symbol: str, math: bool = True) -> int: ...
 
 class Fonts: