qis.append_df_to_feather¶ qis.append_df_to_feather(df, file_name=None, folder_name=None, key=None, local_path=None, keep=None, index_col='timestamp')[source]¶ append csv file Parameters: df (DataFrame) file_name (str) folder_name (str) key (str) local_path (str | None) keep (Literal['first', 'last'] | None) index_col (str | None) Return type: DataFrame