从网上down下来几百首MP3，其中可能会有有重复的，总不能一个一个听，来筛选吧
所以写个Python脚本，通过MD5值校验来比对重复文件，然后把重复的删除掉~

源码
[cce_js]
#!/usr/bin/python
#encoding=utf-8

#import the modules
import os
import os.path
import sys
import hashlib

#define the functions
def findFile(rootPath, fileSeq, delSeq):
  dirs = os.listdir(rootPath) #list the directories under the root path
  for dir in dirs: #traversal all the directories
  path = rootPath + os.sep + dir #complete the path of current file
  if os.path.isdir(path):
  findFile(path, fileSeq, delSeq) #if current file is a directory, recursive the function
  else:
  md5Check(path, fileSeq, delSeq) #if not a directory, check the md5

def md5Check(path, fileSeq, delSeq):
  f = file(path, 'rb') #open the file with 'read-only' and 'binary'
  md5obj = hashlib.md5()
  md5obj.update(f.read()) #calculate the md5
  if md5obj.hexdigest() in fileSeq:
  delSeq.append(path) #if md5 of current file is in the fileSeq, put the file path into the delSeq
  else:
  fileSeq.append(md5obj.hexdigest()) #if not in the fileSeq, put the md5 into the fileSeq
  f.close() #close the file

def delList(delSeq):
  print 'These files are waiting to be removed:'
  for delFile in delSeq:
  print delFile #list the file path in the delSeq

#the main program
fileSeq = []
delSeq = []
while True:
  if len(sys.argv) == 1:
  rootPath = raw_input('Enter the root path: ') #one parameter means no parameter, ask the root path
  else:
  rootPath = sys.argv[1] #or get the second parameter as the root path
  try:
  findFile(rootPath, fileSeq, delSeq) #try if the root path is valid
  except(OSError):
  print 'The root path is invalid. Please enter again. '
  del sys.argv[1:]
  continue #catch the except and delete all invalid parameters
  break

if len(delSeq) == 0 :
  print 'No duplicate file was found! ' #if no files in delSeq, exit
else:
  delList(delSeq) #or list the delSeq
  while True:
  answer = raw_input('Would you want to remove these files? Please answer yes(y) or no(n): ')
  answer.lower
  if answer in ('yes', 'y'): #if "yes"
  for delFile in delSeq:
  try:
  os.remove(delFile) #remove all files in delSeq
  except(OSError):
  print 'Warning! "%s" is not existed! ' % delFile
  continue #ignore the files witch are not existed
  print 'All duplicate files have been removed! '
  break
  elif answer in ('no', 'n'):
  print 'Process has exited without any change! '
  break #if "no", do nothing
  else:
  print 'Please enter yes(y) or no(n). '
sys.exit() #exit

[/cce_js]