python文件的md5加密方法

from hashlib import md5def md5_file(name):  m = md5()  a_file = open(name, 'rb') #需要使用二进制格式读取文件内容  m.update(a_file.read())  a_file.close()  return m.hexdigest()if __main__ == '__init__':  print md5_file('d:/test.txt')

#!/usr/bin/python#encoding=utf-8import ioimport sysimport hashlibimport stringdef printUsage():  print ('''''Usage: [python] pymd5sum.py <filename>''')def main():  if(sys.argv.__len__()==2):    #print(sys.argv[1])    m = hashlib.md5()    file = io.FileIO(sys.argv[1],'r')    bytes = file.read(1024)    while(bytes != b''):      m.update(bytes)      bytes = file.read(1024)    file.close()    #md5value = ""    md5value = m.hexdigest()    print(md5value+"/t"+sys.argv[1])    #dest = io.FileIO(sys.argv[1]+".CHECKSUM.md5",'w')    #dest.write(md5value)    #dest.close()  else:    printUsage()main()