Index: Objects/bytearrayobject.c
===================================================================
--- Objects/bytearrayobject.c	(Revision 67926)
+++ Objects/bytearrayobject.c	(Arbeitskopie)
@@ -1380,14 +1380,19 @@
                            &tableobj, &delobj))
           return NULL;
 
-    if (_getbuffer(tableobj, &vtable) < 0)
+    if (tableobj == Py_None) {
+        table = NULL;
+        tableobj = NULL;
+    } else if (_getbuffer(tableobj, &vtable) < 0) {
         return NULL;
-
-    if (vtable.len != 256) {
-        PyErr_SetString(PyExc_ValueError,
-                        "translation table must be 256 characters long");
-        result = NULL;
-        goto done;
+    } else {
+        if (vtable.len != 256) {
+            PyErr_SetString(PyExc_ValueError,
+                            "translation table must be 256 characters long");
+            result = NULL;
+            goto done;
+        }
+        table = (const char*)vtable.buf;
     }
 
     if (delobj != NULL) {
@@ -1401,7 +1406,6 @@
         vdel.len = 0;
     }
 
-    table = (const char *)vtable.buf;
     inlen = PyByteArray_GET_SIZE(input_obj);
     result = PyByteArray_FromStringAndSize((char *)NULL, inlen);
     if (result == NULL)
@@ -1409,7 +1413,7 @@
     output_start = output = PyByteArray_AsString(result);
     input = PyByteArray_AS_STRING(input_obj);
 
-    if (vdel.len == 0) {
+    if (vdel.len == 0 && table != NULL) {
         /* If no deletions are required, use faster code */
         for (i = inlen; --i >= 0; ) {
             c = Py_CHARMASK(*input++);
@@ -1417,10 +1421,15 @@
         }
         goto done;
     }
-    
-    for (i = 0; i < 256; i++)
-        trans_table[i] = Py_CHARMASK(table[i]);
 
+    if (table == NULL) {
+        for (i = 0; i < 256; i++)
+            trans_table[i] = Py_CHARMASK(i);
+    } else {
+        for (i = 0; i < 256; i++)
+            trans_table[i] = Py_CHARMASK(table[i]);
+    }
+
     for (i = 0; i < vdel.len; i++)
         trans_table[(int) Py_CHARMASK( ((unsigned char*)vdel.buf)[i] )] = -1;
 
@@ -1435,7 +1444,8 @@
         PyByteArray_Resize(result, output - output_start);
 
 done:
-    PyBuffer_Release(&vtable);
+    if (tableobj != NULL)
+        PyBuffer_Release(&vtable);
     if (delobj != NULL)
         PyBuffer_Release(&vdel);
     return result;
Index: Lib/test/test_bytes.py
===================================================================
--- Lib/test/test_bytes.py	(Revision 67926)
+++ Lib/test/test_bytes.py	(Arbeitskopie)
@@ -893,6 +893,8 @@
         c = b.translate(rosetta, b'l')
         self.assertEqual(b, b'hello')
         self.assertEqual(c, b'hee')
+        c = b.translate(None, b'e')
+        self.assertEqual(c, b'hllo')
 
     def test_split_bytearray(self):
         self.assertEqual(b'a b'.split(memoryview(b' ')), [b'a', b'b'])