python web3 uniswapv2合约拿价格 代码

以下是使用 Web3.py 检索 UniswapV2 合约价格的示例代码：

from web3 import Web3

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

# UniswapV2 工厂合约地址
factory_address = '0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f'

# UniswapV2 工厂合约 ABI
factory_abi = [
    {
        "inputs": [],
        "name": "INIT_CODE_PAIR_HASH",
        "outputs": [{"internalType": "bytes32", "name": "", "type": "bytes32"}],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [{"internalType": "address", "name": "tokenA", "type": "address"},
                   {"internalType": "address", "name": "tokenB", "type": "address"}],
        "name": "getPair",
        "outputs": [{"internalType": "address", "name": "", "type": "address"}],
        "stateMutability": "view",
        "type": "function"
    }
]

# 获取 UniswapV2 工厂合约实例
factory = w3.eth.contract(address=factory_address, abi=factory_abi)

# USDT 和 ETH 的地址
usdt_address = '0xdac17f958d2ee523a2206206994597c13d831ec7'
eth_address = '0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2'

# 获取 USDT-ETH 交易对地址
pair_address = factory.functions.getPair(usdt_address, eth_address).call()

# UniswapV2 交易对合约 ABI
pair_abi = [
    {
        "inputs": [],
        "name": "getReserves",
        "outputs": [
            {"internalType": "uint112", "name": "_reserve0", "type": "uint112"},
            {"internalType": "uint112", "name": "_reserve1", "type": "uint112"},
            {"internalType": "uint32", "name": "_blockTimestampLast", "type": "uint32"}
        ],
        "stateMutability": "view",
        "type": "function"
    }
]

# 获取 USDT-ETH 交易对合约实例
pair = w3.eth.contract(address=pair_address, abi=pair_abi)

# 获取 USDT 和 ETH 的储备量
reserves = pair.functions.getReserves().call()
usdt_reserve = reserves[0]
eth_reserve = reserves[1]

# 计算 USDT 对 ETH 的价格
price = eth_reserve / usdt_reserve
print(price)

请注意，代码中的 `your_project_id` 应替换为您的 Infura 项目 ID。此外，如果您要检索其他交易对的价格，则需要替换 `usdt_address` 和 `eth_address` 为所需交易对的代币地址。