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Core Python Programming Exercises P09-21

9-21.

ZIP Archive Files. Create a program that can extract files from or add files to, and perhaps creating, a ZIP archive file.

#!/usr/bin/env python

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

#$Id: p0921.py 167 2010-06-29 06:03:11Z xylz $

'''

This is a 'python' study plan for xylz.

'''

import zipfile

import os

def compress (zip_file,files):

print "compress %s files to %s" % (len(files),zip_file)

f_mode = 'a' if os.path.exist(zip_file) else 'w'

f_out = zipfile.ZipFile(zip_file, f_mode)

in_size = 0

for f in files:

f_out.write(f)

in_size += os.path.getsize(f)

f_out.close()

out_size = os.path.getsize(zip_file)

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

def decompress (zip_file,dstdir,files='*'):

print "decompress %s to %s" % (zip_file,dstdir)

f_in = zipfile.ZipFile(zip_file,'r')

if files == '*':

f_in.extractall(dstdir)

else:

for f in files:

f_in.extract(f,dstdir)

print "extract file",f

f_in.close()

if __name__ == '__main__':

import sys

if len(sys.argv)<4 or ('c'!= sys.argv[1] and 'x'!= sys.argv[1] and 'a'!= sys.argv[1]):

print "Usage: %s c <zipfile> <srcfile>.." % (sys.argv[0],)

print "Usage: %s a <zipfile> <srcfile>.." % (sys.argv[0],)

print "Usage: %s x <zipfile> <destdir> [srcfile].." % (sys.argv[0],)

sys.exit(0)

zip_file = sys.argv[2]

if 'c' == sys.argv[1] or 'a' == sys.argv[1]:

src_files = []

for f in sys.argv[3:]:

src_files.append(f)

compress(zip_file,src_files)

else:

dst_dir = sys.argv[3]

files = '*'

if len(sys.argv)>4:

files = []

for f in sys.argv[4:]:

files.append(f)

decompress (zip_file,dst_dir,files)

posted on 2010-06-29 14:05 imxylz 閱讀(16741) 評(píng)論(0) 編輯收藏所屬分類: Python

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