python通过MD5文件校验来查找重复内容的文件的代码

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#!/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