Test types across environments, remove inexistant setup.pyi, fix all issues on Python 3.13

Author: Avasam

.github/workflows/test.yml

@@ -4,17 +4,24 @@ 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
+        python-version: ["3.9", "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 +38,10 @@ 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 +53,5 @@ jobs:
 
       - name: Run Ruff Linter
         uses: astral-sh/ruff-action@v3
-      - run: ruff format --check
+      - name: Run Ruff Formatter
+        run: ruff format --check

.gitignore

@@ -357,6 +357,9 @@ MigrationBackup/
 # Python virtual environment
 .venv
 
+# Lock files (like uv.lock)
+*.lock
+
 # Build files from utils
 .eggs
 *.egg-info

pyproject.toml

@@ -11,7 +11,7 @@ hygiene = ["ruff ==0.11.*"]
 tests = [
     # Tools used for testing
     "docopt-ng",
-    "mypy ==1.13.*",
+    "mypy ==1.15.*",
     "pyright",
 
     # Typed libraries and stubs
@@ -112,7 +112,7 @@ extra-standard-library = [
 ]
 
 [tool.pyright]
-exclude = ["build", ".git"]
+exclude = ["build", ".git", ".venv*"]
 stubPath = "./stubs"
 pythonversion = "3.9" # Target oldest supported Python version
 typeCheckingMode = "standard"

stubs/matplotlib/_mathtext.pyi

@@ -1,11 +1,19 @@
 import enum
 import functools
+import sys
 from tkinter.tix import HList
 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 = ...
+else:
+    from tkinter.tix import HList
+
 def get_unicode_index(symbol: str, math: bool = True) -> int: ...
 
 class Fonts: