def write_metadata(self, key, values):
values = Series(values)<EOL>self.parent.put(self._get_metadata_path(key), values, format='<STR_LIT>',<EOL>encoding=self.encoding, errors=self.errors,<EOL>nan_rep=self.nan_rep)<EOL>
write out a meta data array to the key as a fixed-format Series

Parameters
----------
key : string
values : ndarray