Another one:

Lib/test/test_json/test_recursion.py:55:24 undefined name 'pyjson'

Code:

    def test_defaultrecursion(self):
        class RecursiveJSONEncoder(self.json.JSONEncoder):
            recurse = False
            def default(self, o):
                if o is JSONTestObject:
                    if self.recurse:
                        return [JSONTestObject]
                    else:
                        return 'JSONTestObject'
                return pyjson.JSONEncoder.default(o)

Here I'm not sure. *Maybe* pyjson.JSONEncoder should be replaced with self.json.JSONEncoder?