估算gas费用时总是出错
有时候,如果您的交易将失败,您会收到错误提示。如果在估算gas费用时发送的地址不正确,则可能会出现此问题。请尝试在estimateGas()
中指定正确的from
地址,像这样:
acct = w3.eth.account.privateKeyToAccount(private_key)
contract.functions.transfer(to_address, 121212).estimateGas({'from': acct.address})
我能以某种方式将找到的代码构建成工作脚本吗?
第二种方法的一个问题是,transact()
将尝试使用您的节点来签署交易。由于您有本地私钥,因此您需要使用 buildTransaction()
进行本地签名。
请参阅 Web3.py 指南,通常介绍本地签署合约交易,但碰巧使用了 ERC20 示例。
大致步骤
- 初始化您的合约对象
- 构建交易
- 使用 w3.eth.account.signTransaction() 签署交易
- 使用 sendRawTransaction() 广播交易
示例
>>> from ethtoken.abi import EIP20_ABI
>>> from web3.auto import w3
>>> unicorns = w3.eth.contract(address="0xfB6916095ca1df60bB79Ce92cE3Ea74c37c5d359", abi=EIP20_ABI)
>>> nonce = w3.eth.getTransactionCount('0x5ce9454909639D2D17A3F753ce7d93fa0b9aB12E')
# Build a transaction that invokes this contract's function, called transfer
>>> unicorn_txn = unicorns.functions.transfer(
... '0xfB6916095ca1df60bB79Ce92cE3Ea74c37c5d359',
... 1,
... ).buildTransaction({
... 'chainId': 1,
... 'gas': 70000,
... 'gasPrice': w3.toWei('1', 'gwei'),
... 'nonce': nonce,
... })
>>> unicorn_txn
{'value': 0,
'chainId': 1,
'gas': 70000,
'gasPrice': 1000000000,
'nonce': 0,
'to': '0xfB6916095ca1df60bB79Ce92cE3Ea74c37c5d359',
'data': '0xa9059cbb000000000000000000000000fb6916095ca1df60bb79ce92ce3ea74c37c5d3590000000000000000000000000000000000000000000000000000000000000001'}
>>> private_key = b"\xb2\\}\xb3\x1f\xee\xd9\x12''\xbf\t9\xdcv\x9a\x96VK-\xe4\xc4rm\x03[6\xec\xf1\xe5\xb3d"
>>> signed_txn = w3.eth.account.signTransaction(unicorn_txn, private_key=private_key)
>>> signed_txn.hash
HexBytes('0x4795adc6a719fa64fa21822630c0218c04996e2689ded114b6553cef1ae36618')
>>> signed_txn.rawTransaction
HexBytes('0xf8a980843b9aca008301117094fb6916095ca1df60bb79ce92ce3ea74c37c5d35980b844a9059cbb000000000000000000000000fb6916095ca1df60bb79ce92ce3ea74c37c5d359000000000000000000000000000000000000000000000000000000000000000125a00fb532eea06b8f17d858d82ad61986efd0647124406be65d359e96cac3e004f0a02e5d7ffcfb7a6073a723be38e6733f353cf9367743ae94e2ccd6f1eba37116f4')
>>> signed_txn.r
7104843568152743554992057394334744036860247658813231830421570918634460546288
>>> signed_txn.s
20971591154030974221209741174186570949918731455961098911091818811306894497524
>>> signed_txn.v
37
>>> w3.eth.sendRawTransaction(signed_txn.rawTransaction)
# When you run sendRawTransaction, you get the same result as the hash of the transaction:
>>> w3.toHex(w3.sha3(signed_txn.rawTransaction))
'0x4795adc6a719fa64fa21822630c0218c04996e2689ded114b6553cef1ae36618'