Python Web3 Ganache - BuildTransaction 上的回溯错误

Question

我正在 YouTube 上学习freeCodeCamp课程，在运行该程序时发现了一个错误。当我试图在 Ganache 中建立一个交易时。我在 Ganache 日志中看到也有活动。第一次发帖，请告诉我还应该提供哪些信息！

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课程：Solidity、区块链和智能合约课程 \xe2\x80\x93 初学者到专家 Python 教程

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transaction = SimpleStorage.constructor().buildTransaction(\n    {"chainId": chain_id, "from": my_address, "nonce": nonce}\n)\n

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终端返回的错误：

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transaction = SimpleStorage.constructor().buildTransaction(\n    {"chainId": chain_id, "from": my_address, "nonce": nonce}\n)\n

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我使用的完整代码如下：

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from solcx import compile_standard, install_solc\nimport json\nfrom web3 import Web3\n\nwith open("./SimpleStorage.sol", "r") as file:\n    simple_storage_file = file.read()\n\n# Compile Our Solidity\nprint("Installing...")\ninstall_solc("0.6.0")\n\ncompiled_sol = compile_standard(\n    {\n        "language": "Solidity",\n        "sources": {"SimpleStorage.sol": {"content": simple_storage_file}},\n        "settings": {\n            "outputSelection": {\n                "*": {\n                    "*": [\n                        "abi",\n                        "metadata",\n                        "evm.bytecode",\n                        "evm.bytecode.sourceMap",\n                    ]\n                }\n            }\n        },\n    },\n    solc_version="0.6.0",\n)\n\nwith open("compiled_code.json", "w") as file:\n    json.dump(compiled_sol, file)\n\n# get bytecode\nbytecode = compiled_sol["contracts"]["SimpleStorage.sol"]["SimpleStorage"]["evm"][\n    "bytecode"\n]["object"]\n\n# get abi\nabi = compiled_sol["contracts"]["SimpleStorage.sol"]["SimpleStorage"]["abi"]\n\n# for connecting to ganache\nw3 = Web3(Web3.HTTPProvider("http://127.0.0.1:7545"))\nchain_id = 5777\nmy_address = "0xf2580f5ddfFb89e69A12a7CbCa8CA175Df4cBe08"\nprivate_key = "0x937073896304af4297e6bbb3a3c623689d48388aa8595058752fafb522b31a13"\n\n# Create the contract in python\nSimpleStorage = w3.eth.contract(abi=abi, bytecode=bytecode)\nprint(SimpleStorage)\n\n# Get the latest transaction\nnonce = w3.eth.getTransactionCount(my_address)\nprint(nonce)\n\n# 1. Build a transaction\n# 2. Sign a transaction\n# 3. Send a transaction\ntransaction = SimpleStorage.constructor().buildTransaction(\n    {"chainId": chain_id, "from": my_address, "nonce": nonce}\n)\nprint(transaction)\n

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Answer 1

从web3.py 5.25.0 开始，我们现在需要将 GasPrice 添加到与本地Ganache链的交易中。添加"gasPrice": w3.eth.gas_price应该可以解决您在交易中的问题。

完整示例：

transaction = SimpleStorage.constructor().buildTransaction(
    {
        "chainId": chain_id,
        "gasPrice": w3.eth.gas_price,
        "from": my_address,
        "nonce": nonce,
    }
)