diff --git a/mlir/include/mlir/Bindings/Python/PybindAdaptors.h b/mlir/include/mlir/Bindings/Python/PybindAdaptors.h
--- a/mlir/include/mlir/Bindings/Python/PybindAdaptors.h
+++ b/mlir/include/mlir/Bindings/Python/PybindAdaptors.h
@@ -291,6 +291,29 @@
   py::object get_class() const { return thisClass; }
 
 protected:
+  /// Defers to the constructor of the superClass the configuration of the
+  /// pybind11 object from the given arguments. Pybind11 has a special handling
+  /// for constructors such that they don't accept a "self" reference, unlike
+  /// Python "__init__" calls. Therefore, one cannot just call the "__init__" of
+  /// the parent class, which would require access to "self". Instead, create an
+  /// instance of the superclass and take its instance pointer to the base C++
+  /// object to populate the instance pointer of the constructed object. Since
+  /// we only deal with _pure_ subclasses, this should be sufficient as derived
+  /// classes cannot have more data fields.
+  template <typename... Args>
+  static void deferToSuperclassConstructor(py::detail::value_and_holder &vh,
+                                           py::object superClass,
+                                           Args &&...args) {
+    py::object super = superClass(std::forward<Args>(args)...);
+    py::detail::type_info *ti =
+        py::detail::get_type_info((PyTypeObject *)superClass.ptr());
+    auto *instance = reinterpret_cast<py::detail::instance *>(super.ptr());
+
+    // Take ownership of the value pointer from the base class.
+    vh.value_ptr() = instance->get_value_and_holder(ti, true).value_ptr();
+    super.release();
+  }
+
   py::object superClass;
   py::object thisClass;
 };
@@ -320,12 +343,16 @@
     // Casting constructor. Note that defining an __init__ method is special
     // and not yet generalized on pure_subclass (it requires a somewhat
     // different cpp_function and other requirements on chaining to super
-    // __init__ make it more awkward to do generally).
+    // __init__ make it more awkward to do generally). It is marked as
+    // `is_new_style_constructor` to suppress the deprecation warning from
+    // pybind11 related to placement-new since we are not doing any allocation
+    // here but relying on the superclass constructor that does "new-style"
+    // allocation for pybind11.
     std::string captureTypeName(
         typeClassName); // As string in case if typeClassName is not static.
     py::cpp_function initCf(
-        [superClass, isaFunction, captureTypeName](py::object self,
-                                                   py::object otherType) {
+        [superClass, isaFunction, captureTypeName](
+            py::detail::value_and_holder &vh, py::object otherType) {
           MlirAttribute rawAttribute = py::cast<MlirAttribute>(otherType);
           if (!isaFunction(rawAttribute)) {
             auto origRepr = py::repr(otherType).cast<std::string>();
@@ -334,9 +361,12 @@
                  " (from " + origRepr + ")")
                     .str());
           }
-          superClass.attr("__init__")(self, otherType);
+          pure_subclass::deferToSuperclassConstructor(vh, superClass,
+                                                      otherType);
         },
-        py::arg("cast_from_type"), py::is_method(py::none()),
+        py::name("__init__"), py::arg("cast_from_type"),
+        py::is_method(scope.attr(typeClassName)),
+        py::detail::is_new_style_constructor(),
         "Casts the passed type to this specific sub-type.");
     thisClass.attr("__init__") = initCf;
 
@@ -371,12 +401,16 @@
     // Casting constructor. Note that defining an __init__ method is special
     // and not yet generalized on pure_subclass (it requires a somewhat
     // different cpp_function and other requirements on chaining to super
-    // __init__ make it more awkward to do generally).
+    // __init__ make it more awkward to do generally). It is marked as
+    // `is_new_style_constructor` to suppress the deprecation warning from
+    // pybind11 related to placement-new since we are not doing any allocation
+    // here but relying on the superclass constructor that does "new-style"
+    // allocation for pybind11.
     std::string captureTypeName(
         typeClassName); // As string in case if typeClassName is not static.
     py::cpp_function initCf(
-        [superClass, isaFunction, captureTypeName](py::object self,
-                                                   py::object otherType) {
+        [superClass, isaFunction, captureTypeName](
+            py::detail::value_and_holder &vh, py::object otherType) {
           MlirType rawType = py::cast<MlirType>(otherType);
           if (!isaFunction(rawType)) {
             auto origRepr = py::repr(otherType).cast<std::string>();
@@ -385,9 +419,12 @@
                                          origRepr + ")")
                                             .str());
           }
-          superClass.attr("__init__")(self, otherType);
+          pure_subclass::deferToSuperclassConstructor(vh, superClass,
+                                                      otherType);
         },
-        py::arg("cast_from_type"), py::is_method(py::none()),
+        py::name("__init__"), py::arg("cast_from_type"),
+        py::is_method(scope.attr(typeClassName)),
+        py::detail::is_new_style_constructor(),
         "Casts the passed type to this specific sub-type.");
     thisClass.attr("__init__") = initCf;