Klaytn use smart contract

def swap(klaytn_api, public_key, eth_amount, usdt_amount):
    """ Uses the KlaySwap Protocol smart contract
    (address: 0xc6a2ad8cc6e4a7e08fc37cc5954be07d499e7654) to make a swap of
    ETH vs USDT.
    """

    # This is the web3.py client.
    w3py = Web3Client(provider=MAINNET, public_key=public_key)

    trade_contract = w3py.w3.eth.contract(
        abi=w3py.swap_contract_ABI, address=w3py.ksp_contract_address)

    # Get the encoded hash of the contract's function and its parameters.
    contract_data = w3py.trade_contract.encodeABI(
        fn_name="exchangeKctNeg",
        args=[
            w3py.kusdt_contract_address,
            usdt_amount,
            w3py.keth_contract_address,
            eth_amount,
            []
        ]
    )

    # Construct a TxTypeSmartContractExecution object for Klaytn.
    sc_tx = {
        "type": '0x30',
        "nonce": klaytn_api.account.get_transaction_count(),
        "gasPrice": klaytn_api.configuration.gas_price(),
        "gas": w3py.w3.toHex(5000000),
        "from": public_key,
        "to": w3py.kethusdt_contract_address,
        "data": contract_data
    }

    # Run the contract on Klaytn and get the result.
    result = klaytn_api.transaction.call(sc_tx)
    return result