@@ -25,8 +25,7 @@ public static void LoadDefaultArgs()
         {
             using (new PythonEngine())
             {
-                var argvref = new BorrowedReference(Runtime.Runtime.PySys_GetObject("argv"));
-                using(var argv = new PyList(argvref.DangerousGetAddress()))
+                using(var argv = new PyList(new BorrowedReference(Runtime.Runtime.PySys_GetObject("argv"))))
                 {
                     Assert.AreNotEqual(0, argv.Length());
                 }
@@ -39,8 +38,7 @@ public static void LoadSpecificArgs()
             var args = new[] { "test1", "test2" };
             using (new PythonEngine(args))
             {
-                var argvref = new BorrowedReference(Runtime.Runtime.PySys_GetObject("argv"));
-                using(var argv = new PyList(argvref.DangerousGetAddress()))
+                using(var argv = new PyList(new BorrowedReference(Runtime.Runtime.PySys_GetObject("argv"))))
                 {
                     Assert.AreEqual(args[0], argv[0].ToString());
                     Assert.AreEqual(args[1], argv[1].ToString());
 
@@ -80,6 +80,25 @@ public PyList(PyObject[] items)
             }
         }
 
+        /// <summary>
+        /// Constructor to make a PyList from a BorrowedReference.
+        /// The list assumes ownership of the reference.
+        /// </summary>
+        /// <param name="r">The borrowed reference</param>
+        internal PyList(BorrowedReference r)
+        {
+            IntPtr addr = r.DangerousGetAddress();
+            if(!Runtime.PyList_Check(addr))
+            {
+                throw new ArgumentException("object is not a list");
+            }
+            
+            obj = addr;
+            // Take ownership.
+            Runtime.XIncref(addr);
+
+        }
+
 
         /// <summary>
         /// IsListType Method
Original file line number	Diff line number	Diff line change
@@ -25,8 +25,7 @@ public static void LoadDefaultArgs()
25	25	{
26	26	using (new PythonEngine())
27	27	{
28		- var argvref = new BorrowedReference(Runtime.Runtime.PySys_GetObject("argv"));
29		- using(var argv = new PyList(argvref.DangerousGetAddress()))
	28	+ using(var argv = new PyList(new BorrowedReference(Runtime.Runtime.PySys_GetObject("argv"))))
30	29	{
31	30	Assert.AreNotEqual(0, argv.Length());
32	31	}
@@ -39,8 +38,7 @@ public static void LoadSpecificArgs()
39	38	var args = new[] { "test1", "test2" };
40	39	using (new PythonEngine(args))
41	40	{
42		- var argvref = new BorrowedReference(Runtime.Runtime.PySys_GetObject("argv"));
43		- using(var argv = new PyList(argvref.DangerousGetAddress()))
	41	+ using(var argv = new PyList(new BorrowedReference(Runtime.Runtime.PySys_GetObject("argv"))))
44	42	{
45	43	Assert.AreEqual(args[0], argv[0].ToString());
46	44	Assert.AreEqual(args[1], argv[1].ToString());