python: apparently I can't name functions from(), hah.

doc/python/magnum.math.rst

@@ -192,6 +192,9 @@
     -   All vector and matrix classes implement :py:`len()`, which is used
         instead of e.g. :dox:`Math::Vector::Size`. Works on both classes
         and instances.
+    -   :dox:`Math::Matrix3::from()` / :dox:`Math::Matrix4::from()` are named
+        :ref:`Matrix3.from_()` / :ref:`Matrix4.from_()` because :py:`from` is
+        a Python keyword and thus can't be used as a name.
     -   :cpp:`Math::gather()` and :cpp:`Math::scatter()` operations are
         implemented as real swizzles:
 

doc/python/pages/changelog.rst

@@ -35,6 +35,10 @@ Changelog
 `Changes since 2020.06`_
 ========================
 
+-   Renamed :py:`Matrix3.from()` / :py:`Matrix4.from()` to :ref:`Matrix3.from_()`
+    / :ref:`Matrix4.from_()` because :py:`from` is a Python keyword and it
+    would be silly to have to write :py:`getattr(Matrix4, 'from')` just to use
+    these APIs
 -   Exposed :ref:`gl.Renderer.set_blend_function()`,
     :ref:`gl.Renderer.set_blend_equation()` and related enums (see :gh:`mosra/magnum-bindings#9`)
 -   Exposed :ref:`gl.Renderer.Feature.CLIP_DISTANCEn <gl.Renderer.Feature.CLIP_DISTANCE0>`

src/python/magnum/math.matrix.h

@@ -560,7 +560,7 @@ template<class T> void matrices(
             "2D shearning matrix along the Y axis", py::arg("amount"))
         .def_static("projection", &Math::Matrix3<T>::projection,
             "2D projection matrix", py::arg("size"))
-        .def_static("from", static_cast<Math::Matrix3<T>(*)(const Math::Matrix2x2<T>&, const Math::Vector2<T>&)>(&Math::Matrix3<T>::from),
+        .def_static("from_", static_cast<Math::Matrix3<T>(*)(const Math::Matrix2x2<T>&, const Math::Vector2<T>&)>(&Math::Matrix3<T>::from),
             "Create a matrix from a rotation/scaling part and a translation part",
             py::arg("rotation_scaling"), py::arg("translation"))
         .def(py::init<const Math::Vector3<T>&, const Math::Vector3<T>&, const Math::Vector3<T>&>(),
@@ -760,7 +760,7 @@ Overloaded function.
             "3D off-center perspective projection matrix", py::arg("bottom_left"), py::arg("top_right"), py::arg("near"), py::arg("far"))
         .def_static("look_at", &Math::Matrix4<T>::lookAt,
             "Matrix oriented towards a specific point", py::arg("eye"), py::arg("target"), py::arg("up"))
-        .def_static("from", static_cast<Math::Matrix4<T>(*)(const Math::Matrix3x3<T>&, const Math::Vector3<T>&)>(&Math::Matrix4<T>::from),
+        .def_static("from_", static_cast<Math::Matrix4<T>(*)(const Math::Matrix3x3<T>&, const Math::Vector3<T>&)>(&Math::Matrix4<T>::from),
             "Create a matrix from a rotation/scaling part and a translation part",
             py::arg("rotation_scaling"), py::arg("translation"))
         .def(py::init<const Math::Vector4<T>&, const Math::Vector4<T>&, const Math::Vector4<T>&, const Math::Vector4<T>&>(),

src/python/magnum/test/test_math.py

@@ -619,6 +619,22 @@ def test_init_tuple_of_tuples(self):
                                       Vector4(13.0, 14.0, 15.0, 16.0)))
 
     def test_static_methods(self):
+        a = Matrix3.from_(Matrix2x2((1.0, 2.0),
+                                    (4.0, 5.0)),
+                          Vector2(7.0, 8.0))
+        self.assertEqual(a, Matrix3(Vector3(1.0, 2.0, 0.0),
+                                    Vector3(4.0, 5.0, 0.0),
+                                    Vector3(7.0, 8.0, 1.0)))
+
+        a = Matrix4.from_(Matrix3x3((1.0, 2.0, 3.0),
+                                    (5.0, 6.0, 7.0),
+                                    (9.0, 10.0, 11.0)),
+                          Vector3(13.0, 14.0, 15.0))
+        self.assertEqual(a, Matrix4x4(Vector4(1.0, 2.0, 3.0, 0.0),
+                                      Vector4(5.0, 6.0, 7.0, 0.0),
+                                      Vector4(9.0, 10.0, 11.0, 0.0),
+                                      Vector4(13.0, 14.0, 15.0, 1.0)))
+
         a = Matrix3x4.from_diagonal((1.0, 2.0, 3.0))
         self.assertEqual(a.diagonal(), (1.0, 2.0, 3.0))
         self.assertEqual(a, Matrix3x4((1.0, 0.0, 0.0, 0.0),