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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def save(self, filename, clobber=False, **kwargs):
 """ Save the model configuration to a YAML-formatted file. :param filename: The filename to save the model configuration to. :type filename: str :param clobber: [optional] Clobber the filename if it already exists. :type clobber: bool :returns: True :raises: IOError """


        if os.path.exists(filename) and not clobber:
            raise IOError("filename {} already exists".format(filename))

        kwds = {
            "allow_unicode": True, 
            "default_flow_style": False
        }
        kwds.update(kwargs)
        with open(filename, "w+") as fp:
            yaml.safe_dump(self._configuration, stream=fp, **kwds)
        return True