python 文件輸入/輸出

可以使用file類(lèi)打開(kāi)一個(gè)文件，使用file的read、readline和write來(lái)恰當(dāng)?shù)淖x寫(xiě)文件。對(duì)文件讀寫(xiě)能力取決于打開(kāi)文件時(shí)使用的模式，常用模式、有讀模式("r")、寫(xiě)模式("w")、追加模式("a")，文件操作之后需要調(diào)用close方法來(lái)關(guān)閉文件。

 1 test = '''\

 2 This is a program about file I/O.

 3 

 4 Author: Peter Zhange

 5 Date: 2011/12/25

 6 '''

 7 

 8 f = file("test.txt", "w") # open for writing, the file will be created if the file doesn't exist

 9 f.write(test) # write text to file

10 f.close() # close the file

11 

12 f = file("test.txt") # if no mode is specified, the default mode is readonly.

13 

14 while True:

15     line = f.readline()

16     if len(line) == 0:  # zero length indicates the EOF of the file

17         break

18     print line,

19 

20 f.close()