code: def spendables_for_address(self, address):
          
          URL = self.api_domain + "/unspent?active=%s" % address
          r = json.loads(urlopen(URL).read().decode("utf8"))
          spendables = []
          for u in r["unspent_outputs"]:
              coin_value = u["value"]
              script = h2b(u["script"])
              previous_hash = h2b(u["tx_hash"])
              previous_index = u["tx_output_n"]
              spendables.append(Tx.Spendable(coin_value, script, previous_hash, previous_index))
          return spendables
docs: Return a list of Spendable objects for the
          given bitcoin address.