python md5 计算的例子

#!/usr/bin/python
import sys
import hashlib

def main() :
        try :
                file = open(sys.argv[1], 'rb')
                md5 = hashlib.md5()
                buffer = file.read( 2 ** 20 )
                while buffer :
                        md5.update(buffer)
                        buffer = file.read( 2 ** 20 )
                file.close()
                print (md5.hexdigest())

        except:
                import os
                print 'execption ... '

if __name__ == '__main__' :
        main()