大数据机器学习

读取CSV（逗号分割）文件到DataFrame 也支持文件的部分导入和选择迭代 更多帮助参见：http://pandas.pydata.org/pandas-docs/stable/io.html 参数： filepath_or_buffer : str，pathlib。str, pathlib.Path, py._path.local.LocalPath or any o

Parameters: decimals : int, dict, Series Number of decimal places to round each column to. If an int is given, round each column to the same number of places. Otherwise dict and Series round t

pandas.DataFrame.to_csv DataFrame.to_csv(path_or_buf=None, sep=’, ’, na_rep=”, float_format=None, columns=None, header=True, index=True, index_label=None, mode=’w’, encoding=None, compression=None,