用python计算出大文件的md5码,某路径下所有文件的md5码

#coding:utf-8

#md5check.py
#读文件,转成md5码
#如没有文件路径，则询问
#是文件，返回md5码
#是路径把其下所有文件返回md5码
#参考：http://www.joelverhagen.com/blog/2011/02/md5-hash-of-file-in-python/
import hashlib
import sys
import os

def md5Checksum(filePath):
fh = open(filePath, 'rb')
m = hashlib.md5()
while True:
data = fh.read(8192)
if not data:
break
m.update(data)
fh.close()
return m.hexdigest()

def pathispath(ps_path):
if os.path.isfile(ps_path):
pa_path=os.path.split(ps_path)
print ' '*32,pa_path[0]
print md5Checksum(ps_path),
print pa_path[1]
else:
if os.path.isdir(ps_path):
for ps_one in os.walk(ps_path):
print ' '*32,ps_one[0]
for ps_file in ps_one[2]:
print md5Checksum(os.path.join(ps_one[0],ps_file)),
print ps_file

if __name__ == '__main__':
ls_file=''
if len(sys.argv)>1:
ls_file=sys.argv[1]

if ''==ls_file:
ls_file=raw_input('filepath?:')

if os.path.exists(ls_file):
#if os.path.isfile(ls_file):
#    print md5Checksum(ls_file)
#else:
#    if os.path.isdir(ls_file):
#        pathispath(ls_file)
pathispath(ls_file)
else:
print 'not filepath!'