Change assertRaises to assertRaisesRegex in test_xmlrpc (#481) (#675)

(cherry picked from commit c6b448b)

Author: berkerpeksag

Lib/test/test_xmlrpc.py

@@ -364,22 +364,22 @@ def test_registered_func_is_none(self):
 
         dispatcher = xmlrpc.server.SimpleXMLRPCDispatcher()
         dispatcher.register_function(None, name='method')
-        with self.assertRaises(Exception, expected_regex='method'):
+        with self.assertRaisesRegex(Exception, 'method'):
             dispatcher._dispatch('method', ('param',))
 
     def test_instance_has_no_func(self):
         """Attempts to call nonexistent function on a registered instance"""
 
         dispatcher = xmlrpc.server.SimpleXMLRPCDispatcher()
         dispatcher.register_instance(object())
-        with self.assertRaises(Exception, expected_regex='method'):
+        with self.assertRaisesRegex(Exception, 'method'):
             dispatcher._dispatch('method', ('param',))
 
     def test_cannot_locate_func(self):
         """Calls a function that the dispatcher cannot locate"""
 
         dispatcher = xmlrpc.server.SimpleXMLRPCDispatcher()
-        with self.assertRaises(Exception, expected_regex='method'):
+        with self.assertRaisesRegex(Exception, 'method'):
             dispatcher._dispatch('method', ('param',))