def filter_out_none_valued_keys(self, d):<EOL>
new_d = {}<EOL>for k, v in d.items():<EOL><INDENT>if v is not None:<EOL><INDENT>new_d[k] = v<EOL><DEDENT><DEDENT>return new_d<EOL>
Given a dict, returns a new dict with all the same key/values except
        for keys that had values of None.