DataFrame.swapaxes(axis1, axis2, copy=True)

DataFrame.isin(values)

DataFrame.nsmallest(n, columns, keep='first')

DataFrame.combineAdd(other)

DataFrame.to_period(freq=None, axis=0, copy=True)

DataFrame.bfill(axis=None, inplace=False, limit=None, downcast=None)

DataFrame.to_string(buf=None, columns=None, col_space=None, header=True, index=True, na_rep='NaN', formatters=None, float_format=None,

DataFrame.to_clipboard(excel=None, sep=None, **kwargs)

DataFrame.to_gbq(destination_table, project_id, chunksize=10000, verbose=True, reauth=False, if_exists='fail', private_key=None)

DataFrame.le(other, axis='columns', level=None)