试图将SmartContract写入Pancakeswap路由器时出现Web3.py"未知帐户"错误

Question

我开始开发一个小程序，该程序应该允许我通过pancakeswap路由器购买代币。当我尝试进行交易时；未知账户"；错误我想这可能是因为我应该在本地"登录"到我的元任务帐户，但这只是我的假设。我导出了我的私钥，并试图使用w3.eth.account.from_key(privateKey)从中创建一个帐户，但它什么也没做。我还试着对所有地址执行w3.toChecksumAddress(address)，但它什么也没做。我不知道在这一点上我能做什么。

这是我的代码：

binanceRPC = 'https://bsc-dataseed1.defibit.io/'
w3 = Web3(Web3.HTTPProvider(binanceRPC))

PCS_V2_ADDR = w3.toChecksumAddress(
'0x10ED43C718714eb63d5aA57B78B54704E256024E')
PCS_ABI = #there would be pcs ABI but i needed to delete it due to character limit on stack
PCS_ROUTER_CONTRACT = w3.eth.contract(address=PCS_V2_ADDR, abi=PCS_ABI)
print(w3.isConnected())  # True
WBNB = w3.toChecksumAddress('0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c')
shitcoin = w3.toChecksumAddress('0x3ee2200efb3400fabb9aacf31297cbdd1d435d47')
nonce = w3.eth.get_transaction_count(testAccAddr)
amountIn = 0.0005
tx = {
'nonce': nonce,
'from': testAccAddr,
'to': PCS_V2_ADDR,
'gasPrice': 5,
'gas': 165250,
'value': w3.toWei(amountIn, 'ether')
}
w3.eth.account.privateKeyToAccount(testAccPrvKey)
print(w3.eth.accounts)  # []
txHash = PCS_ROUTER_CONTRACT.functions.swapExactETHForTokens(0, [w3.toChecksumAddress('0xbb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c'), w3.toChecksumAddress(
'0x3ee2200efb3400fabb9aacf31297cbdd1d435d47')], testAccAddr, 1621289953).transact(tx)  # ValueError: {'code': -32000, 'message': 'unknown account'}

Answer 1

试试这样的东西：

account = w3.eth.account.privateKeyToAccount(testAccPrvKey)
w3.eth.default_account = account.address
txn = PCS_ROUTER_CONTRACT.functions.swapExactETHForTokens(0, 
[w3.toChecksumAddress('0xbb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c'), 
w3.toChecksumAddress('0x3ee2200efb3400fabb9aacf31297cbdd1d435d47')], 
testAccAddr, 1621289953).buildTransaction({
'chainId': 97, #This is testnet
'value': w3.toWei(amountIn, 'ether'),
'nonce': nonce,
})

signed_txn = account.signTransaction(txn)
txid = w3.toHex(w3.eth.sendRawTransaction(signed_txn.rawTransaction))