智能合约 python

智能合约是一种在区块链上执行的自动化合约。Python是一种常用的编程语言，也可以用于编写智能合约。在Python中，可以使用一些库来编写智能合约，例如Web3.py和Solidity.py。下面是一个使用Web3.py库编写智能合约的示例：

from web3 import Web3

# 连接到以太坊节点
w3 = Web3(Web3.HTTPProvider('https://mainnet.infura.io/v3/your-infura-project-id'))

# 加载智能合约ABI
contract_abi = [
    {
        "constant": False,
        "inputs": [
            {
                "name": "x",
                "type": "uint256"
            }
        ],
        "name": "set",
        "outputs": [],
        "payable": False,
        "stateMutability": "nonpayable",
        "type": "function"
    },
    {
        "constant": True,
        "inputs": [],
        "name": "get",
        "outputs": [
            {
                "name": "",
                "type": "uint256"
            }
        ],
        "payable": False,
        "stateMutability": "view",
        "type": "function"
    }
]

# 部署智能合约
contract_address = '0x1234567890abcdef1234567890abcdef12345678'
contract = w3.eth.contract(address=contract_address, abi=contract_abi)

# 调用智能合约方法
transaction = contract.functions.set(42).buildTransaction({
    'from': w3.eth.accounts[0],
    'gas': 100000,
    'gasPrice': w3.toWei('1', 'gwei'),
    'nonce': w3.eth.getTransactionCount(w3.eth.accounts[0])
})
signed_transaction = w3.eth.account.signTransaction(transaction, private_key='your-private-key')
transaction_hash = w3.eth.sendRawTransaction(signed_transaction.rawTransaction)
transaction_receipt = w3.eth.waitForTransactionReceipt(transaction_hash)

# 获取智能合约状态
result = contract.functions.get().call()

print("智能合约状态：", result)

请注意，上述示例中的合约ABI和地址是虚构的，您需要根据您自己的合约来替换它们。此外，您还需要替换连接到以太坊节点的URL和私钥。