# ft基本功能示例

By [0xcodinnnng](https://paragraph.com/@0xcodinnnng) · 2023-09-14

---

    from loguru import logger
    
    from web3 import Web3
    import json
    
    
    def get_buy_price(shares_subject, amount):
        try:
            buy_price = contract.functions.getBuyPriceAfterFee(shares_subject, amount).call()
            return buy_price
        except Exception as e:
            logger.error(f'get buy price error:{e}')
    
    
    def trade(from_address, private_key, buy_price, amount):
        try:
            gas_price = w3.eth.gas_price * 1.1
            gas_price = Web3.from_wei(int(gas_price), 'gwei')
            transaction = contract.functions.buyShares(shares_subject, amount).build_transaction({
                'from': from_address,
                'value': buy_price,
                'gas': 2000000,
                'nonce': w3.eth.get_transaction_count(from_address),
                'gasPrice': w3.to_wei(gas_price, 'gwei'),
            })
    
            signed_transaction = w3.eth.account.sign_transaction(transaction, private_key)
    
            transaction_hash = w3.eth.send_raw_transaction(signed_transaction.rawTransaction)
    
            logger.info(f"Transaction:{w3.to_hex(transaction_hash)}")
        except Exception as e:
            logger.error(f'{from_address}:transaction error:{e}')
    
    
    if __name__ == '__main__':
        w3 = Web3(Web3.HTTPProvider("https://mainnet.base.org"))
    
        abi_file = '''
        [{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"trader","type":"address"},{"indexed":false,"internalType":"address","name":"subject","type":"address"},{"indexed":false,"internalType":"bool","name":"isBuy","type":"bool"},{"indexed":false,"internalType":"uint256","name":"shareAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"ethAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"protocolEthAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"subjectEthAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"supply","type":"uint256"}],"name":"Trade","type":"event"},{"inputs":[{"internalType":"address","name":"sharesSubject","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"buyShares","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"sharesSubject","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"getBuyPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"sharesSubject","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"getBuyPriceAfterFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"supply","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"getPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"sharesSubject","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"getSellPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"sharesSubject","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"getSellPriceAfterFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"protocolFeeDestination","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"protocolFeePercent","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sharesSubject","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"sellShares","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_feeDestination","type":"address"}],"name":"setFeeDestination","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_feePercent","type":"uint256"}],"name":"setProtocolFeePercent","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_feePercent","type":"uint256"}],"name":"setSubjectFeePercent","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"sharesBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"sharesSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"subjectFeePercent","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]
        '''
    
        contract_abi = json.loads(abi_file)
        contract_address = '0xCF205808Ed36593aa40a44F10c7f7C2F67d4A4d4'
        contract = w3.eth.contract(address=contract_address, abi=contract_abi)
    
        # 自己ft账号的地址和密钥
        from_address = ""
        private_key = ""
    
        # 输入要买keys的地址
        shares_subject = Web3.to_checksum_address("")
    
        # 买一个
        amount_1 = 1
        buy_price_1 = get_buy_price(shares_subject, amount_1)
        print(f'buy_price:{buy_price_1}')
        trade(from_address, private_key, buy_price_1, amount_1)

---

*Originally published on [0xcodinnnng](https://paragraph.com/@0xcodinnnng/ft)*