pythonnet · filmor · Feb 24, 2026 · Feb 16, 2026 · Oct 28, 2025 · Nov 24, 2025
diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
@@ -0,0 +1,2 @@
+# Line endings normalization
+fd7c7e1cbd8e1d7bdb2ec2423c3cf9f95a3abed1
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
@@ -6,7 +6,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Doxygen Action
       uses: mattnotmitt/[email protected]
       with:

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
@@ -36,9 +36,13 @@ jobs:
 
           - category: macos
             platform: x64
-            instance: macos-13
+            instance: macos-14
 
-        python: ["3.10", "3.11", "3.12", "3.13"]
+          - category: macos
+            platform: arm64
+            instance: macos-14-arm64
+
+        python: ["3.10", "3.11", "3.12", "3.13", "3.14"]
 
     steps:
       - name: Set Environment on macOS
@@ -48,23 +52,27 @@ jobs:
           mono-version: latest
 
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v5
         with:
           dotnet-version: '8.0.x'
 
       - name: Set up Python ${{ matrix.python }}
-        uses: astral-sh/setup-uv@v6
+        uses: astral-sh/setup-uv@v7
         with:
           architecture: ${{ matrix.os.platform }}
           python-version: ${{ matrix.python }}
+          cache-python: true
           activate-environment: true
           enable-cache: true
 
       - name: Synchronize the virtual environment
-        run: uv sync
+        run: uv sync --managed-python
+
+      - name: Show pyvenv.cfg
+        run: cat .venv/pyvenv.cfg
 
       - name: Embedding tests (Mono/.NET Framework)
         run: dotnet test --runtime any-${{ matrix.os.platform }} --framework net472 --logger "console;verbosity=detailed" src/embed_tests/
@@ -88,4 +96,8 @@ jobs:
         run: pytest --runtime netfx
 
       - name: Python tests run from .NET
+        # For some reason, it won't find pytest on the Windows + 3.10
+        # combination, which hints that it does not handle the venv properly in
+        # this combination.
+        if: ${{ matrix.os.category != 'windows' || matrix.python != '3.10' }}
         run: dotnet test --runtime any-${{ matrix.os.platform }} src/python_tests_runner/
diff --git a/.github/workflows/nuget-preview.yml b/.github/workflows/nuget-preview.yml
@@ -21,7 +21,7 @@ jobs:
           echo "DATE_VER=$(date "+%Y-%m-%d")" >> $GITHUB_ENV
 
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v5

diff --git a/Directory.Build.props b/Directory.Build.props
@@ -4,11 +4,12 @@
     <AssemblyCopyright>Copyright (c) 2006-2025 The Contributors of the Python.NET Project</AssemblyCopyright>
     <AssemblyCompany>pythonnet</AssemblyCompany>
     <AssemblyProduct>Python.NET</AssemblyProduct>
-    <LangVersion>10.0</LangVersion>
+    <LangVersion>12.0</LangVersion>
     <IsPackable>false</IsPackable>
     <FullVersion>$([System.IO.File]::ReadAllText("$(MSBuildThisFileDirectory)version.txt").Trim())</FullVersion>
     <VersionPrefix>$(FullVersion.Split('-', 2)[0])</VersionPrefix>
     <VersionSuffix Condition="$(FullVersion.Contains('-'))">$(FullVersion.Split('-', 2)[1])</VersionSuffix>
+    <RepositoryRoot>$(MSBuildThisFileDirectory)</RepositoryRoot>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />

diff --git a/doc/make.bat b/doc/make.bat
@@ -1,35 +1,35 @@
-@ECHO OFF
-
-pushd %~dp0
-
-REM Command file for Sphinx documentation
-
-if "%SPHINXBUILD%" == "" (
-	set SPHINXBUILD=sphinx-build
-)
-set SOURCEDIR=source
-set BUILDDIR=build
-
-%SPHINXBUILD% >NUL 2>NUL
-if errorlevel 9009 (
-	echo.
-	echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
-	echo.installed, then set the SPHINXBUILD environment variable to point
-	echo.to the full path of the 'sphinx-build' executable. Alternatively you
-	echo.may add the Sphinx directory to PATH.
-	echo.
-	echo.If you don't have Sphinx installed, grab it from
-	echo.https://www.sphinx-doc.org/
-	exit /b 1
-)
-
-if "%1" == "" goto help
-
-%SPHINXBUILD% -M %1 %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
-goto end
-
-:help
-%SPHINXBUILD% -M help %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
-
-:end
-popd
+@ECHO OFF
+
+pushd %~dp0
+
+REM Command file for Sphinx documentation
+
+if "%SPHINXBUILD%" == "" (
+	set SPHINXBUILD=sphinx-build
+)
+set SOURCEDIR=source
+set BUILDDIR=build
+
+%SPHINXBUILD% >NUL 2>NUL
+if errorlevel 9009 (
+	echo.
+	echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
+	echo.installed, then set the SPHINXBUILD environment variable to point
+	echo.to the full path of the 'sphinx-build' executable. Alternatively you
+	echo.may add the Sphinx directory to PATH.
+	echo.
+	echo.If you don't have Sphinx installed, grab it from
+	echo.https://www.sphinx-doc.org/
+	exit /b 1
+)
+
+if "%1" == "" goto help
+
+%SPHINXBUILD% -M %1 %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
+goto end
+
+:help
+%SPHINXBUILD% -M help %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
+
+:end
+popd
diff --git a/pyproject.toml b/pyproject.toml
@@ -13,7 +13,7 @@ dependencies = [
     "clr_loader>=0.2.7,<0.3.0"
 ]
 
-requires-python = ">=3.10, <3.14"
+requires-python = ">=3.10, <3.15"
 
 classifiers = [
     "Development Status :: 5 - Production/Stable",

diff --git a/requirements.txt b/requirements.txt
diff --git a/src/embed_tests/CallableObject.cs b/src/embed_tests/CallableObject.cs
@@ -9,34 +9,37 @@ namespace Python.EmbeddingTest
 {
     public class CallableObject
     {
+        IPythonBaseTypeProvider BaseTypeProvider;
+
         [OneTimeSetUp]
         public void SetUp()
         {
-            PythonEngine.Initialize();
             using var locals = new PyDict();
             PythonEngine.Exec(CallViaInheritance.BaseClassSource, locals: locals);
-            CustomBaseTypeProvider.BaseClass = new PyType(locals[CallViaInheritance.BaseClassName]);
-            PythonEngine.InteropConfiguration.PythonBaseTypeProviders.Add(new CustomBaseTypeProvider());
+            BaseTypeProvider = new CustomBaseTypeProvider(new PyType(locals[CallViaInheritance.BaseClassName]));
+            PythonEngine.InteropConfiguration.PythonBaseTypeProviders.Add(BaseTypeProvider);
         }
 
         [OneTimeTearDown]
         public void Dispose()
         {
-            PythonEngine.Shutdown();
+            PythonEngine.InteropConfiguration.PythonBaseTypeProviders.Remove(BaseTypeProvider);
         }
+
         [Test]
         public void CallMethodMakesObjectCallable()
         {
             var doubler = new DerivedDoubler();
             dynamic applyObjectTo21 = PythonEngine.Eval("lambda o: o(21)");
-            Assert.AreEqual(doubler.__call__(21), (int)applyObjectTo21(doubler.ToPython()));
+            Assert.That((int)applyObjectTo21(doubler.ToPython()), Is.EqualTo(doubler.__call__(21)));
         }
+
         [Test]
         public void CallMethodCanBeInheritedFromPython()
         {
             var callViaInheritance = new CallViaInheritance();
             dynamic applyObjectTo14 = PythonEngine.Eval("lambda o: o(14)");
-            Assert.AreEqual(callViaInheritance.Call(14), (int)applyObjectTo14(callViaInheritance.ToPython()));
+            Assert.That((int)applyObjectTo14(callViaInheritance.ToPython()), Is.EqualTo(callViaInheritance.Call(14)));
         }
 
         [Test]
@@ -48,7 +51,7 @@ public void CanOverwriteCall()
             scope.Exec("orig_call = o.Call");
             scope.Exec("o.Call = lambda a: orig_call(a*7)");
             int result = scope.Eval<int>("o.Call(5)");
-            Assert.AreEqual(105, result);
+            Assert.That(result, Is.EqualTo(105));
         }
 
         class Doubler
@@ -71,16 +74,14 @@ class {BaseClassName}(MyCallableBase): pass
             public int Call(int arg) => 3 * arg;
         }
 
-        class CustomBaseTypeProvider : IPythonBaseTypeProvider
+        class CustomBaseTypeProvider(PyType BaseClass) : IPythonBaseTypeProvider
         {
-            internal static PyType BaseClass;
-
             public IEnumerable<PyType> GetBaseTypes(Type type, IList<PyType> existingBases)
             {
-                Assert.Greater(BaseClass.Refcount, 0);
+                Assert.That(BaseClass.Refcount, Is.GreaterThan(0));
                 return type != typeof(CallViaInheritance)
                     ? existingBases
-                    : new[] { BaseClass };
+                    : [BaseClass];
             }
         }
     }

diff --git a/src/embed_tests/ClassManagerTests.cs b/src/embed_tests/ClassManagerTests.cs
@@ -6,18 +6,6 @@ namespace Python.EmbeddingTest
 {
     public class ClassManagerTests
     {
-        [OneTimeSetUp]
-        public void SetUp()
-        {
-            PythonEngine.Initialize();
-        }
-
-        [OneTimeTearDown]
-        public void Dispose()
-        {
-            PythonEngine.Shutdown();
-        }
-
         [Test]
         public void NestedClassDerivingFromParent()
         {

diff --git a/src/embed_tests/CodecGroups.cs b/src/embed_tests/CodecGroups.cs
@@ -20,7 +20,7 @@ public void GetEncodersByType()
             };
 
             var got = group.GetEncoders(typeof(Uri)).ToArray();
-            CollectionAssert.AreEqual(new[]{encoder1, encoder2}, got);
+            Assert.That(got, Is.EqualTo(new[] { encoder1, encoder2 }).AsCollection);
         }
 
         [Test]
@@ -31,9 +31,13 @@ public void CanEncode()
                 new ObjectToEncoderInstanceEncoder<Uri>(),
             };
 
-            Assert.IsTrue(group.CanEncode(typeof(Tuple<int>)));
-            Assert.IsTrue(group.CanEncode(typeof(Uri)));
-            Assert.IsFalse(group.CanEncode(typeof(string)));
+            Assert.Multiple(() =>
+            {
+                Assert.That(group.CanEncode(typeof(Tuple<int>)), Is.True);
+                Assert.That(group.CanEncode(typeof(Uri)), Is.True);
+                Assert.That(group.CanEncode(typeof(string)), Is.False);
+            });
+
         }
 
         [Test]
@@ -50,12 +54,12 @@ public void Encodes()
 
             var uri = group.TryEncode(new Uri("data:"));
             var clrObject = (CLRObject)ManagedType.GetManagedObject(uri);
-            Assert.AreSame(encoder1, clrObject.inst);
-            Assert.AreNotSame(encoder2, clrObject.inst);
+            Assert.That(clrObject.inst, Is.SameAs(encoder1));
+            Assert.That(clrObject.inst, Is.Not.SameAs(encoder2));
 
             var tuple = group.TryEncode(Tuple.Create(1));
             clrObject = (CLRObject)ManagedType.GetManagedObject(tuple);
-            Assert.AreSame(encoder0, clrObject.inst);
+            Assert.That(clrObject.inst, Is.SameAs(encoder0));
         }
 
         [Test]
@@ -72,11 +76,11 @@ public void GetDecodersByTypes()
             };
 
             var decoder = group.GetDecoder(pyfloat, typeof(string));
-            Assert.AreSame(decoder2, decoder);
+            Assert.That(decoder, Is.SameAs(decoder2));
             decoder = group.GetDecoder(pystr, typeof(string));
-            Assert.IsNull(decoder);
+            Assert.That(decoder, Is.Null);
             decoder = group.GetDecoder(pyint, typeof(long));
-            Assert.AreSame(decoder1, decoder);
+            Assert.That(decoder, Is.SameAs(decoder1));
         }
         [Test]
         public void CanDecode()
@@ -91,10 +95,14 @@ public void CanDecode()
                 decoder2,
             };
 
-            Assert.IsTrue(group.CanDecode(pyint, typeof(long)));
-            Assert.IsFalse(group.CanDecode(pyint, typeof(int)));
-            Assert.IsTrue(group.CanDecode(pyfloat, typeof(string)));
-            Assert.IsFalse(group.CanDecode(pystr, typeof(string)));
+            Assert.Multiple(() =>
+            {
+                Assert.That(group.CanDecode(pyint, typeof(long)));
+                Assert.That(group.CanDecode(pyint, typeof(int)), Is.False);
+                Assert.That(group.CanDecode(pyfloat, typeof(string)));
+                Assert.That(group.CanDecode(pystr, typeof(string)), Is.False);
+            });
+
         }
 
         [Test]
@@ -109,24 +117,14 @@ public void Decodes()
                 decoder2,
             };
 
-            Assert.IsTrue(group.TryDecode(new PyInt(10), out long longResult));
-            Assert.AreEqual(42, longResult);
-            Assert.IsTrue(group.TryDecode(new PyFloat(10), out string strResult));
-            Assert.AreSame("atad:", strResult);
-
-            Assert.IsFalse(group.TryDecode(new PyInt(10), out int _));
-        }
-
-        [SetUp]
-        public void SetUp()
-        {
-            PythonEngine.Initialize();
-        }
-
-        [TearDown]
-        public void Dispose()
-        {
-            PythonEngine.Shutdown();
+            Assert.Multiple(() =>
+            {
+                Assert.That(group.TryDecode(new PyInt(10), out long longResult));
+                Assert.That(longResult, Is.EqualTo(42));
+                Assert.That(group.TryDecode(new PyFloat(10), out string strResult));
+                Assert.That(strResult, Is.SameAs("atad:"));
+                Assert.That(group.TryDecode(new PyInt(10), out int _), Is.False);
+            });
         }
     }
 }
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		# Line endings normalization
		fd7c7e1cbd8e1d7bdb2ec2423c3cf9f95a3abed1