def spendables_for_address(self, address):
        """
        Return a list of Spendable objects for the
        given bitcoin address.
        """
        spendables = []
        r = json.loads(urlopen(self.base_url('get_tx_unspent', address)).read().decode("utf8"))

        for u in r['data']['txs']:
            coin_value = int(float(u['value']) * 100000000)
            script = h2b(u["script_hex"])
            previous_hash = h2b_rev(u["txid"])
            previous_index = u["output_no"]
            spendables.append(Tx.Spendable(coin_value, script, previous_hash, previous_index))

        return spendables
Return a list of Spendable objects for the
        given bitcoin address.