python 生成文件MD5码

pymd5.py的代码如下：

 

 

#-*-coding:utf-8-*-
'''
Created on 2012-5-25

@author: kanpiaoxue
'''  
import hashlib
import os
import sys

  
def printUsage():  
    print ('Usage: [python] pymd5.py <filename>')  
      
def createMD5(filePath):  
    if not os.path.isfile(filePath):
        printUsage()
    else:
        tmpLength = 1024
        m = hashlib.md5()
        with open(filePath, 'rb') as f:
            b = f.read(tmpLength)
            while b != b'':
                m.update(b)
                b = f.read(tmpLength)
            print filePath, ' MD5:\t', m.hexdigest().upper()
if __name__ == '__main__':
    if 2 != len(sys.argv):
        printUsage() 
    else:
        f = sys.argv[1]
        createMD5(f)