--- a/genshi/template/base.py
+++ b/genshi/template/base.py
@@ -247,6 +247,18 @@
     def pop(self):
         """Pop the top-most scope from the stack."""
 
+    def copy(self):
+        """Create a copy of this Context object."""
+        # required to make f_locals a dict-like object
+        # See http://genshi.edgewall.org/ticket/249 for
+        # example use case in Twisted tracebacks
+        ctxt = Context()
+        ctxt.frames.pop()  # pop empty dummy context
+        ctxt.frames.extend(self.frames)
+        ctxt._match_templates.extend(self._match_templates)
+        ctxt._choice_stack.extend(self._choice_stack)
+        return ctxt
+
 
 def _apply_directives(stream, directives, ctxt, vars):
     """Apply the given directives to the stream.