Index: source/blender/python/api2_2x/doc/Object.py
===================================================================
--- source/blender/python/api2_2x/doc/Object.py	(revision 15590)
+++ source/blender/python/api2_2x/doc/Object.py	(working copy)
@@ -374,6 +374,8 @@
 	@type matrixOldWorld: Matrix
 	@ivar matrixWorld: Same as L{mat}. Read-only.
 	@type matrixWorld: Matrix
+	@ivar negativeScale: Value is true if the object has negative scale. For mesh objects negative scale will cause the normals of the mesh to be flipped when the matrix (see L{matrix}) is applied to the mesh.
+	@type negativeScale: boolean
 	@ivar colbits: The Material usage mask. A set bit #n means: the Material
 		#n in the Object's material list is used. Otherwise, the Material #n
 		of the Objects Data material list is displayed.
Index: source/blender/python/api2_2x/Object.c
===================================================================
--- source/blender/python/api2_2x/Object.c	(revision 15590)
+++ source/blender/python/api2_2x/Object.c	(working copy)
@@ -4436,6 +4436,19 @@
 			GET_INT_FROM_POINTER(type), 'h' );
 }
 
+static PyObject *Object_getNegativeScale( BPy_Object *self, void *type)
+{
+	float vec[3];
+	
+	/* test object matrix for negative scale */
+	Crossf(vec, self->object->obmat[0], self->object->obmat[1]);
+	if (Inpf(vec, self->object->obmat[2]) < 0){
+		return EXPP_incr_ret_True();
+	}else{
+		return EXPP_incr_ret_False();
+	}
+}
+
 static PyObject *Object_getLayers( BPy_Object * self )
 {
 	int layers, bit;
@@ -4990,6 +5003,10 @@
 	 (getter)Object_getMatrixOldWorld, (setter)NULL,
 	 "old-type worldspace matrix (prior to Blender 2.34)",
 	 NULL},
+	{"negativeScale",
+	 (getter)Object_getNegativeScale, (setter)NULL,
+	 "Value is true if the object has negative scale",
+	 NULL},
 	{"data",
 	 (getter)get_obj_data, (setter)NULL,
 	 "The Datablock object linked to this object",