pythonnet
diff --git a/‎src/python_tests_runner/PythonTestRunner.cs
Lines changed: 1 addition & 0 deletions b/‎src/python_tests_runner/PythonTestRunner.cs
Lines changed: 1 addition & 0 deletions
diff --git a/‎src/runtime/Types/ClassDerived.cs
Lines changed: 10 additions & 1 deletion b/‎src/runtime/Types/ClassDerived.cs
Lines changed: 10 additions & 1 deletion
diff --git a/‎tests/test_subclass.py
Lines changed: 9 additions & 1 deletion b/‎tests/test_subclass.py
Lines changed: 9 additions & 1 deletion
@@ -42,6 +42,7 @@ static IEnumerable<string[]> PythonTestCases()
             yield return new[] { "test_subclass", "test_class_with_attributes" };
             yield return new[] { "test_subclass", "test_class_with_advanced_attribute" };
             yield return new[] { "test_subclass", "test_more_subclasses" };
+            yield return new[] { "test_subclass", "abstract_test" };<
8000
/div>
         }
 
         /// <summary>
 
@@ -280,8 +280,16 @@ internal static Type CreateDerivedType(string name,
                 baseClass = typeof(object);
             }
 
+            bool isAbstract = false;
+            if (py_dict != null && Runtime.PyDict_Check(py_dict))
+            {
+                using var dict = new PyDict(py_dict);
+                if (dict.HasKey("__clr_abstract__"))
+                    isAbstract = true;
+            }
+
             TypeBuilder typeBuilder = moduleBuilder.DefineType(name,
-                TypeAttributes.Public | TypeAttributes.Class,
+                TypeAttributes.Public | TypeAttributes.Class | (isAbstract ? TypeAttributes.Abstract : 0),
                 baseClass,
                 interfaces.ToArray());
 
@@ -359,6 +367,7 @@ internal static Type CreateDerivedType(string name,
             if (py_dict != null && Runtime.PyDict_Check(py_dict))
             {
                 using var dict = new PyDict(py_dict);
+
                 if (dict.HasKey("__clr_attributes__"))
                 {
                     var attributes = new PyList(dict["__clr_attributes__"]);
 
@@ -376,7 +376,15 @@ def IncrementThing(self):
     obj = None
     SimpleClass.Test2()
 
-
+def abstract_test():
+    class abstractClass(SimpleClass):
+        __clr_abstract__ = True
+    failed = False
+    try:
+        abstractClass()
+    except:
+        failed = True
+    assert failed
 
 def test_construction_from_clr():
     import clr
Original file line number	Diff line number	Diff line change
`@@ -42,6 +42,7 @@ static IEnumerable<string[]> PythonTestCases()`
`42`	`42`	`yield return new[] { "test_subclass", "test_class_with_attributes" };`
`43`	`43`	`yield return new[] { "test_subclass", "test_class_with_advanced_attribute" };`
`44`	`44`	`yield return new[] { "test_subclass", "test_more_subclasses" };`
	`45`	`+` `yield return new[] { "test_subclass", "abstract_test" };< 8000 /div>`
`45`	`46`	`}`
`46`	`47`
`47`	`48`	`/// <summary>`