利用os、hash模块生成目录下所有文件的md5

 1 #!/usr/bin/env python
 2 
 3 import os
 4 import sys
 5 import hashlib
 6 
 7 try:
 8     dirpath = sys.argv[1]
 9 except IndexError as e:
10     sys.exit(‘need one dirctory‘)
11 if os.path.isfile(dirpath):
12    sys.exit(‘Please input a directory‘)
13 
14 pathobj = os.walk(dirpath)
15 
16 def md5sum(f):
17     m = hashlib.md5()
18     with open(f) as fd:
19         while True:
20             data = fd.read(4096)    #每次读取一部分，避免因为文件过大，造成对内存的压力
21             if data:
22                 m.update(data)
23             else:
24                 break
25     return m.hexdigest()
26 
27 for roots,dirs,files in pathobj:
28     for file in files:
29         filename =  os.path.join(roots,file)
30         md5 = md5sum(filename)
31         print md5,filename