python - 如何使用 web3.py 获取给定 ETH 地址的特定代币余额

Question

我开始使用 web.py。我有一个要求，我需要在给定的 ETH 地址(这个地址不是合约所有者)获得可用的代币余额，通过文档我偶然发现了以下功能:

https://web3py.readthedocs.io/en/stable/contracts.html#web3.contract.ContractFunction.call

token_contract.functions.myBalance().call({'from': web3.eth.accounts[1]})

所以在上面几行中，我写了这个:

from web3 import HTTPProvider, Web3
import requests

w3 = Web3(HTTPProvider('https://ropsten.infura.io/RPw9nHRS7Ue47RaKVvHM'))

url_eth = "https://api.etherscan.io/api"
contract_address = '0x0CdCdA4E7FCDD461Ba82B61cBc4163E1022f22e4'
API_ENDPOINT = url_eth+"?module=contract&action=getabi&address="+str(contract_address)

r = requests.get(url = API_ENDPOINT)
response = r.json()

instance = w3.eth.contract(
    address=Web3.toChecksumAddress(contract_address),
    abi = response["result"]
)
send_address = "0xF35A192475527f80EfcfeE5040C8B5BBB596F69A"
balance = instance.functions.balance_of.call({'from':send_address}) 
#balnce = instance.functions.myBalance.call({'from':send_address})
print("----------------------",balance)

我收到以下错误:

"Are you sure you provided the correct contract abi?"
web3.exceptions.MismatchedABI: ("The function 'balance_of' was not foundin this contract's abi. ", 'Are you sure you provided the correct contract abi?')

**更新** 我摆脱了上面的异常，现在我得到了以下异常:

send_address = "0xF35A192475527f80EfcfeE5040C8B5BBB596F69A"
balance = instance.functions.balanceOf.call(send_address)
#Error :
call_transaction = dict(**transaction)
TypeError: type object argument after ** must be a mapping, not str

如果我尝试这样做:

send_address = "0xF35A192475527f80EfcfeE5040C8B5BBB596F69A"
balance = instance.functions.balanceOf.call({'from':send_address})
#Error:
AttributeError: 'balanceOf' object has no attribute 'args'

Answer 1

在最后一个代码示例中，尝试将第二行修改为如下所示:balance = instance.functions.balanceOf().call({'from':send_address})。 balance of 之后的括号是您传递给 solidity 函数的参数。