python web3 6.3 uniswapv2合约拿价代码

以下是使用 Python Web3 6.3 获取 UniswapV2 合约价格的示例代码：

from web3 import Web3
import json

# 合约地址和ABI
uniswapv2_address = "0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D"
uniswapv2_abi = json.loads('''
[
  {
    "inputs": [],
    "stateMutability": "nonpayable",
    "type": "constructor"
  },
  {
    "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"
  },
  {
    "inputs": [],
    "name": "WETH",
    "outputs": [
      {
        "internalType": "address",
        "name": "",
        "type": "address"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  }
]
''')

# 初始化 Web3
web3 = Web3(Web3.HTTPProvider("https://mainnet.infura.io/v3/your-project-id"))

# 获取 UniswapV2 合约
uniswapv2_contract = web3.eth.contract(address=uniswapv2_address, abi=uniswapv2_abi)

# 获取 WETH 地址
weth_address = uniswapv2_contract.functions.WETH().call()

# 获取 ETH/USDT 交易对地址
eth_address = web3.toChecksumAddress("0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2")
usdt_address = web3.toChecksumAddress("0xdac17f958d2ee523a2206206994597c13d831ec7")
eth_usdt_pair_address = uniswapv2_contract.functions.getPair(eth_address, usdt_address).call()

# 获取 ETH/USDT 交易对合约
eth_usdt_pair_contract = web3.eth.contract(address=eth_usdt_pair_address, abi=uniswapv2_abi)

# 获取 ETH/USDT 交易对中 ETH 和 USDT 的余额
eth_balance, usdt_balance, _ = eth_usdt_pair_contract.functions.getReserves().call()

# 计算 ETH/USDT 交易对价格
eth_price = usdt_balance / eth_balance

print(f"ETH/USDT price: {eth_price}")

请注意，此示例代码仅适用于以太坊主网。如果您使用的是其他网络，请相应地更改 Web3 提供程序的 URL。另外，请确保您拥有正确的 Infura 项目 ID。