Index: Modules/arraymodule.c
===================================================================
--- Modules/arraymodule.c	(revision 80673)
+++ Modules/arraymodule.c	(working copy)
@@ -1919,7 +1919,9 @@
 
 	if (!(initial == NULL || PyList_Check(initial)
 	      || PyString_Check(initial) || PyTuple_Check(initial)
-	      || (c == 'u' && PyUnicode_Check(initial)))) {
+	      || (c == 'u' && PyUnicode_Check(initial))
+	      || (array_Check(initial)
+		  && c == ((arrayobject*)initial)->ob_descr->typecode))) {
 		it = PyObject_GetIter(initial);
 		if (it == NULL)
 			return NULL;
@@ -1935,17 +1937,20 @@
 			PyObject *a;
 			Py_ssize_t len;
 
-			if (initial == NULL || !(PyList_Check(initial) 
-				|| PyTuple_Check(initial)))
+			if (initial == NULL)
 				len = 0;
+			else if (PyList_Check(initial))
+				len = PyList_GET_SIZE(initial);
+			else if (PyTuple_Check(initial) || array_Check(initial))
+				len = Py_SIZE(initial);
 			else
-				len = PySequence_Size(initial);
+				len = 0;
 
 			a = newarrayobject(type, len, descr);
 			if (a == NULL)
 				return NULL;
 
-			if (len > 0) {
+			if (len > 0 && !array_Check(initial)) {
 				Py_ssize_t i;
 				for (i = 0; i < len; i++) {
 					PyObject *v =
@@ -1994,6 +1999,10 @@
 					self->allocated = Py_SIZE(self);
 				}
 #endif
+			} else if (initial != NULL && array_Check(initial)) {
+				arrayobject *self = (arrayobject *)a;
+				arrayobject *other = (arrayobject *)initial;
+				memcpy(self->ob_item, other->ob_item, len * other->ob_descr->itemsize);
 			}
 			if (it != NULL) {
 				if (array_iter_extend((arrayobject *)a, it) == -1) {
Index: Lib/test/test_array.py
===================================================================
--- Lib/test/test_array.py	(revision 80673)
+++ Lib/test/test_array.py	(working copy)
@@ -228,6 +228,11 @@
         if a.itemsize>1:
             self.assertRaises(ValueError, b.fromstring, "x")
 
+    def test_fromarray(self):
+        a = array.array(self.typecode, self.example)
+        b = array.array(self.typecode, a)
+        self.assertEqual(a, b)
+
     def test_repr(self):
         a = array.array(self.typecode, 2*self.example)
         self.assertEqual(a, eval(repr(a), {"array": array.array}))
@@ -947,6 +952,11 @@
 
         self.assertRaises(AttributeError, setattr, a, "color", "blue")
 
+    def test_frombytearray(self):
+        a = array.array('b', range(10))
+        b = array.array(self.typecode, a)
+        self.assertEqual(a, b)
+
 class SignedNumberTest(NumberTest):
     example = [-1, 0, 1, 42, 0x7f]
     smallerexample = [-1, 0, 1, 42, 0x7e]