NodeSet: accept decodable unicode strings

Change typecheck from str to basestring to give a try to any input
unicode string (must be decodable).

Closes #251.

Change-Id: Ia0f6a23dd6809d31320d54dc599150c7f66a0d64

Author: thiell

lib/ClusterShell/NodeSet.py

@@ -784,7 +784,7 @@ def parse(self, nsobj, autostep):
             return nsobj
 
         # or is nsobj a string?
-        if type(nsobj) is str:
+        if isinstance(nsobj, basestring):
             try:
                 return self.parse_string(str(nsobj), autostep)
             except (NodeUtils.GroupSourceQueryFailed, RuntimeError), exc:

tests/NodeSetTest.py

@@ -2474,3 +2474,10 @@ def test_nd_fold_axis_multi(self):
         n1.fold_axis = range(3)
         self.assertEqual(str(n1), "da[1-2]c[1-2],ln[0-1],master,slave,x[1-2]y[1-2]z[1-2]")
         self.assertEqual(len(n1), 16)
+
+    def test_unicode(self):
+        """test NodeSet with unicode string"""
+        nodeset = NodeSet(u"node1")
+        self._assertNode(nodeset, "node1")
+        # not sure about that, can it work if PYTHONIOENCODING is set?
+        self.assertRaises(UnicodeEncodeError, NodeSet, u"\u0ad0[000-042]")