1 .首先查询当前的工作路径: {代码...} 2 .方法: {代码...} {代码...} 路径 path_or_buf: A string path to the file to write or a StringIO {代码...} 分隔符 sep : Field delimiter for the output file (default ”,”) {代码...} 替换空值 na_rep: A string representation of a missing value (default ‘’) {代码....