Python 如何使用web3.py获取给定ETH地址上的特定令牌余额

我正在开始使用web.py。我有一个要求，即我需要在给定的ETH地址（该地址不是合同所有人）获得可用的代币余额，通过这些文件，我偶然发现了以下功能：

在上面的几行中，我写了这样一句话：

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)

我得到以下错误：

"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**我消除了上述异常，现在我得到以下异常：

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'

---

在上一个代码示例中，尝试修改第二行，使其如下所示：

balance=instance.functions.balanceOf（）.call（{'from'：send_address}）

。balance of后的括号是传递给solidity函数的参数。

您必须查看合同是否具有“balance of”函数。执行时

balance = instance.functions.balanceOf.call(send_address)

您正在执行合同功能的平衡，如果合同没有该功能，它将给出错误

balance = instance.functions.balanceOf.call(send_address)