--- a/genshi/template/astutil.py
+++ b/genshi/template/astutil.py
@@ -21,7 +21,7 @@
     def parse(source, mode):
         return compile(source, '', mode, _ast.PyCF_ONLY_AST)
 
-from genshi.compat import IS_PYTHON2
+from genshi.compat import IS_PYTHON2, isstring
 
 __docformat__ = 'restructuredtext en'
 
@@ -103,8 +103,13 @@
         self._new_line()
         return self.visit(node.body)
 
+    # Python < 3.4
     # arguments = (expr* args, identifier? vararg,
     #              identifier? kwarg, expr* defaults)
+    #
+    # Python >= 3.4
+    # arguments = (arg* args, arg? vararg, arg* kwonlyargs, expr* kw_defaults,
+    #              arg? kwarg, expr* defaults)
     def visit_arguments(self, node):
         first = True
         no_default_count = len(node.args) - len(node.defaults)
@@ -122,13 +127,21 @@
                 self._write(', ')
             else:
                 first = False
-            self._write('*' + node.vararg)
+            self._write('*')
+            if isstring(node.vararg):
+                self._write(node.vararg)
+            else:
+                self.visit(node.vararg)
         if getattr(node, 'kwarg', None):
             if not first:
                 self._write(', ')
             else:
                 first = False
-            self._write('**' + node.kwarg)
+            self._write('**')
+            if isstring(node.kwarg):
+                self._write(node.kwarg)
+            else:
+                self.visit(node.kwarg)
 
     if not IS_PYTHON2:
         # In Python 3 arguments get a special node
@@ -724,6 +737,17 @@
     def visit_Name(self, node):
         self._write(node.id)
 
+    # NameConstant(singleton value)
+    def visit_NameConstant(self, node):
+        if node.value is None:
+            self._write('None')
+        elif node.value is True:
+            self._write('True')
+        elif node.value is False:
+            self._write('False')
+        else:
+            raise Exception("Unknown NameConstant %r" % (node.value,))
+
     # List(expr* elts, expr_context ctx)
     def visit_List(self, node):
         self._write('[')
@@ -829,6 +853,7 @@
     visit_Attribute = _clone
     visit_Subscript = _clone
     visit_Name = _clone
+    visit_NameConstant = _clone
     visit_List = _clone
     visit_Tuple = _clone