xylz,imxylz

關(guān)注后端架構(gòu)、中間件、分布式和并發(fā)編程

:: 管理 ::

111 隨筆 :: 10 文章 :: 2680 評(píng)論 :: 0 Trackbacks

Core Python Programming Exercises P09-20

9-20.

Compressed Files. Write a short piece of code that will compress and decompress gzipped or bzipped files. Confirm your solution works by using the command-line gzip or bzip2 programs or a GUI program like PowerArchiver, StuffIt, and/or WinZip.

#!/usr/bin/env python
2

#-*- coding:utf-8 -*-
3

#$Id: p0920.py 166 2010-06-29 03:46:56Z xylz $
4

'''
6

This is a 'python' study plan for xylz.
7

'''
9

import gzip
11

import os
12

def compress (dst,f):
14

print "compress %s to %s" % (f,dst)
15

f_out = gzip.open(dst,'wb')
16

f_in = open(f,'rb')
17

f_out.writelines(f_in)
18

f_in.close()
19

f_out.close()
20

in_size = os.path.getsize(f)
21

out_size = os.path.getsize(dst)
22

print "source size %d bytes, target size %d bytes, %d%%" % (in_size,out_size,(out_size*100/in_size))
23

def decompress (f,dst):
25

print "decompress %s to %s" % (f,dst)
26

f_in = gzip.open(f,'rb')
27

f_out = open(dst,'wb')
28

f_out.writelines(f_in)
29

f_in.close()
30

f_out.close()
31

in_size = os.path.getsize(f)
32

out_size = os.path.getsize(dst)
33

print "source size %d bytes, target size %d bytes, %d%%" % (in_size,out_size,(in_size*100/out_size))
34

if __name__ == '__main__':
37

import sys
38

if len(sys.argv)<3 or ('c'!= sys.argv[1] and 'x'!= sys.argv[1]):
39

print "Usage: %s <c|x> <file> [destfile]" % (sys.argv[0],)
40

sys.exit(0)
41

src_file = sys.argv[2]
42

dest_file = None
43

if len(sys.argv)>3:
44

dest_file = sys.argv[3]
45

if 'c' == sys.argv[1]:
48

if not dest_file:
49

dest_file = src_file+".gz"
50

compress(dest_file,src_file)
51

else:
53

if not dest_file:
54

dest_file = src_file[:src_file.index('.gz')] #raise exception if file error
55

decompress(src_file,dest_file)
56

下面是一次執(zhí)行的輸出結(jié)果：

C:\Users\xylz\Desktop\core_python>python p0920.py

Usage: p0920.py <c|x> <file> [destfile]

C:\Users\xylz\Desktop\core_python>python p0920.py c p0920.py

compress p0920.py to p0920.py.gz

source size 1587 bytes, target size 614 bytes, 38%

C:\Users\xylz\Desktop\core_python>python p0920.py x p0920.py.gz p0920.py.2

decompress p0920.py.gz to p0920.py.2

source size 614 bytes, target size 1587 bytes, 38%

C:\Users\xylz\Desktop\core_python>md5sum p0920.py p0920.py.2

3383e1a05fbede400dd016feed8a55bf *p0920.py

3383e1a05fbede400dd016feed8a55bf *p0920.py.2

posted on 2010-06-29 11:51 imxylz 閱讀(16707) 評(píng)論(0) 編輯收藏所屬分類(lèi): Python

新用戶(hù)注冊(cè) 刷新評(píng)論列表


只有注冊(cè)用戶(hù)登錄后才能發(fā)表評(píng)論。




網(wǎng)站導(dǎo)航: 博客園 IT新聞 Chat2DB C++博客博問(wèn) 管理
相關(guān)文章: Core Python Programming Exercises P09-22 Core Python Programming Exercises P09-21 Core Python Programming Exercises P09-20 Core Python Programming Exercises P08-04/05/06/07/11/12 Core Python Programming Exercises P07-10 Core Python Programming Exercises P06-13/14/15/16 Core Python Programming Exercises P06-12 Core Python Programming Exercises P06-11 Core Python Programming Exercises P06-10 Core Python Programming Exercises Chapter 6

xylz,imxylz

公告

常用鏈接

留言簿(149)

隨筆分類(lèi)(137)

隨筆檔案(107)

文章分類(lèi)(12)

文章檔案(12)

友情鏈接

搜索

積分與排名

最新評(píng)論

閱讀排行榜

評(píng)論排行榜