▍1. read-and-write-CSV-file
可以实现CSV的写入文件读取。同样如果将程序稍作改动就可实现各种格式的文件的写入和读取。文件是以逗号和回车为间隔的写入的。这样可以用excel软件打开该文件。同时,在读取时,将存取的数字在逗号和回车的交替中提取出来。(You can write the CSV file to read. The same if the program make a little change can be achieved in various formats file write and read. The file is comma and carriage return intervals write. This can open the file with excel software. The same time, in reading, access to digital in the alternation of comma and carriage return is extracted. )