Python 里的I/O文件操作

1.打开文件： 

f = open("xx.txt","r+")    //the "r+" can allow you to read and write the file , "r" can only allow you to read it

2.写入文件：

my_file.write(anything you want but in String formation) // it can only be used when you are allowed to write

3.读文件：

my_file.read()    // the returned value will be the content of the text

4.关闭文件：

my_file.close()

5.可以查看closed属性判断文件是否关闭，如果为True，则表示文件已经关闭，如果为False则表示文件未关闭。