怎样把dataframe利用fileappend存储起来并方便查看呢？

Vars DataFrame df; Plot plt; DataFrame tmp_df; Events OnInit() { Array<Array<Numeric>> datas=[[0.11,0.12,0.13,0.14,0.15],[0.21,0.22,0.23,0.24,0.25],[0.31,0.32,0.33,0.34,0.35],[0.41,0.42,0.43,0.44,0.45]]; Array<String> columns = ["北京","天津","上海","沈阳","广州"]; df.init(datas,columns); Array<String> index = ["地区1","地区2","地区3","地区4"]; df.rename(index); print("df = "); print(df.toString()); //设置单元格 df.setValue("地区2","天津",99.9); print("setValue(地区2,天津,99.9),df = "); print(df.toString()); df.setValue(1,1,9.9); print("setValue(1,1,9.9),df = "); print(df.toString()); //设置行 Array<Numeric> values = [10.1,10.2,10.3,10.4,10.5]; df.setLoc("地区2",values); print("setLoc(地区2,[10.1,10.2,10.3,10.4,10.5]).df = "); print(df.toString()); df.setLoc("地区2",99.9); print("setLoc(地区2,99.9),df = "); print(df.toString()); df.setILoc(1,[:],values); print("setILoc(1,[:],[10.1,10.2,10.3,10.4,10.5]),df = "); print(df.toString()); //设置列 df.setPos("天津",[:],values); print("setPos(天津,[:],[10.1,10.2,10.3,10.4,10.5]),df = "); print(df.toString()); FileAppend("D:\\aaa", df.toString()); }代码就是案例代码，print出来之后dataframe是这样，我怎样利用FileAppend把他放在数据中心查看呢？如果这样写FileAppend("D:\\aaa", df.toString());，就只有一行。如果选择“|”来分列，就也不能很顺利的观看，怎么样才能如excel一样看到整个dataframe呢？分列后如下面所示不选择分列就是如下所示：