读文文件md5值

import hashlib
import sys



def check_md5(src):
    m = hashlib.md5()
    with open('src','rb') as fobj:
        while True:
            data = fobj.read(4096)
            if not data:
                break
            m.update(data)

    return m.hexdigest()


if __name__ == '__main__':
  print(check_md5(sys.argv[1]))