from paddingoracle import BadPaddingException, PaddingOracle

def check_paddind_error(data):
 ...


class PadBuster(PaddingOracle):

    def __init__(self, **kwargs):
        super(PadBuster, self).__init__(**kwargs)

 def oracle(self, data, **kwargs):
  if check_paddind_error(data):
   raise BadPaddingException


if __name__ == '__main__':

 padbuster = PadBuster()
 cleantext = padbuster.decrypt(encrypted_cookie, block_size=8, iv=bytearray(8))

 print "Cleantext: {}".format(cleantext)