How to use the bitbox02.bitbox02.btc.BTC function in bitbox02

raise Exception(
                "Need to setup communication first before attempting any BitBox02 calls"
            )

        self.fail_if_not_initialized()

        xpub_keypath = bip32.convert_bip32_path_to_list_of_uint32(bip32_path)
        coin_network = self.coin_network_from_electrum_network()

        if xtype == "p2wpkh":
            if coin_network == bitbox02.btc.BTC:
                out_type = bitbox02.btc.BTCPubRequest.ZPUB
            else:
                out_type = bitbox02.btc.BTCPubRequest.VPUB
        elif xtype == "p2wpkh-p2sh":
            if coin_network == bitbox02.btc.BTC:
                out_type = bitbox02.btc.BTCPubRequest.YPUB
            else:
                out_type = bitbox02.btc.BTCPubRequest.UPUB
        elif xtype == "p2wsh":
            if coin_network == bitbox02.btc.BTC:
                out_type = bitbox02.btc.BTCPubRequest.CAPITAL_ZPUB
            else:
                out_type = bitbox02.btc.BTCPubRequest.CAPITAL_VPUB
        # The other legacy types are not supported
        else:
            raise Exception("invalid xtype:{}".format(xtype))

        return self.bitbox02_device.btc_xpub(
            keypath=xpub_keypath,
            xpub_type=out_type,
            coin=coin_network,

def coin_network_from_electrum_network(self) -> int:
        if constants.net.TESTNET:
            return bitbox02.btc.TBTC
        return bitbox02.btc.BTC

def sign_transaction(
        self,
        keystore: Hardware_KeyStore,
        tx: PartialTransaction,
        wallet: Deterministic_Wallet,
    ):
        if tx.is_complete():
            return

        if self.bitbox02_device is None:
            raise Exception(
                "Need to setup communication first before attempting any BitBox02 calls"
            )

        coin = bitbox02.btc.BTC
        if constants.net.TESTNET:
            coin = bitbox02.btc.TBTC

        tx_script_type = None

        # Build BTCInputType list
        inputs = []
        for txin in tx.inputs():
            my_pubkey, full_path = keystore.find_my_pubkey_in_txinout(txin)

            if full_path is None:
                raise Exception(
                    "A wallet owned pubkey was not found in the transaction input to be signed"
                )

            prev_tx = txin.utxo