KeyError: 'name' abi error on web3 Python
Question:
I’m trying to buy tokens using the swapExactTokensForTokens() Pancakeswap Router function), web3 imported in Python.
Problem 1: I keep getting an abi KeyError: ‘name’. Here’s my code and error below. I’m not sure how to handle this error.
problem 2: Is it possible to call the abi of a token without hardcoding it like I did below?
Code:
from web3 import Web3
import json
import key
import time
bsc = "https://bsc-dataseed.binance.org/"
web3 = Web3(Web3.HTTPProvider(bsc))
print(web3.isConnected())
print("Block Number: ", web3.eth.blockNumber)
#My wallet address
sender_address = '0x111111111111111111111111111111111111'
#Pancakeswap router address instantiate and ABI code
panRouterContractAddress = '0x10ED43C718714eb63d5aA57B78B54704E256024E'
panAbi = '[{"inputs":[{"internalType":"address","name":"_factory","type":"address"},{"internalType":"address","name":"_WETH","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"WETH","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"},{"internalType":"uint256","name":"amountADesired","type":"uint256"},{"internalType":"uint256","name":"amountBDesired","type":"uint256"},{"internalType":"uint256","name":"amountAMin","type":"uint256"},{"internalType":"uint256","name":"amountBMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"addLiquidity","outputs":[{"internalType":"uint256","name":"amountA","type":"uint256"},{"internalType":"uint256","name":"amountB","type":"uint256"},{"internalType":"uint256","name":"liquidity","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountTokenDesired","type":"uint256"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"addLiquidityETH","outputs":[{"internalType":"uint256","name":"amountToken","type":"uint256"},{"internalType":"uint256","name":"amountETH","type":"uint256"},{"internalType":"uint256","name":"liquidity","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"factory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"reserveIn","type":"uint256"},{"internalType":"uint256","name":"reserveOut","type":"uint256"}],"name":"getAmountIn","outputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"reserveIn","type":"uint256"},{"internalType":"uint256","name":"reserveOut","type":"uint256"}],"name":"getAmountOut","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"}],"name":"getAmountsIn","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"}],"name":"getAmountsOut","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountA","type":"uint256"},{"internalType":"uint256","name":"reserveA","type":"uint256"},{"internalType":"uint256","name":"reserveB","type":"uint256"}],"name":"quote","outputs":[{"internalType":"uint256","name":"amountB","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountAMin","type":"uint256"},{"internalType":"uint256","name":"amountBMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"removeLiquidity","outputs":[{"internalType":"uint256","name":"amountA","type":"uint256"},{"internalType":"uint256","name":"amountB","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"removeLiquidityETH","outputs":[{"internalType":"uint256","name":"amountToken","type":"uint256"},{"internalType":"uint256","name":"amountETH","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"removeLiquidityETHSupportingFeeOnTransferTokens","outputs":[{"internalType":"uint256","name":"amountETH","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"bool","name":"approveMax","type":"bool"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"removeLiquidityETHWithPermit","outputs":[{"internalType":"uint256","name":"amountToken","type":"uint256"},{"internalType":"uint256","name":"amountETH","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"bool","name":"approveMax","type":"bool"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"removeLiquidityETHWithPermitSupportingFeeOnTransferTokens","outputs":[{"internalType":"uint256","name":"amountETH","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountAMin","type":"uint256"},{"internalType":"uint256","name":"amountBMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"bool","name":"approveMax","type":"bool"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"removeLiquidityWithPermit","outputs":[{"internalType":"uint256","name":"amountA","type":"uint256"},{"internalType":"uint256","name":"amountB","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapETHForExactTokens","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactETHForTokens","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactETHForTokensSupportingFeeOnTransferTokens","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactTokensForETH","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactTokensForETHSupportingFeeOnTransferTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactTokensForTokens","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactTokensForTokensSupportingFeeOnTransferTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMax","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapTokensForExactETH","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMax","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapTokensForExactTokens","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"amountOut"}]'
contract = web3.eth.contract(address=panRouterContractAddress, abi=panAbi)
#Spend token instantiate and ABI
tokenToSpend = web3.toChecksumAddress("0xe9e7CEA3DedcA5984780Bafc599bD69ADd087D56") #Contract address for purchase currency (BUSD)
spendAbi = '[{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"constant":true,"inputs":[],"name":"_decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"_name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"_symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]'
spendTokenContract = web3.eth.contract(tokenToSpend, abi=spendAbi) #Spend token instance
#Contract address of token and amount to purchase
tokenToBuy = web3.toChecksumAddress(input("Enter Token Address to buy: "))
#Input contract address for the token to purchase
amountIn = web3.toWei(input("How much to spend? "), 'ether')
#Amount of purchase currency to spend
#Trade execution (To accomodate fees, use the function: swapExactTokensForTokensSupportingFeeOnTransferTokens)
pancakeswap2_txn = contract.functions.swapExactTokensForTokens(amountIn, 0, [tokenToSpend,tokenToBuy], sender_address, (int(time.time()) + 1000000)).buildTransaction({
'from': sender_address,
'value': amountIn,
'gas': 250000,
'gasPrice': web3.toWei('5','gwei'),
'nonce': web3.eth.get_transaction_count(sender_address),
})
signed_txn = web3.eth.account.sign_transaction(pancakeswap2_txn, private_key=key.private)
tx_token = web3.eth.send_raw_transaction(signed_txn.rawTransaction)
print("Success!: " + web3.toHex(tx_token))
Error:
True
Block Number: 9762322
Enter Token Address to buy: 0x0e09fabb73bd3ade0a17ecc321fd13a19e81ce82
How much BUSD to spend? 1
Traceback (most recent call last):
File "c:/Users/Owner/Documents/BlockchainPy/MyCodes/test.py", line 30, in <module>
pancakeswap2_txn = contract.functions.swapExactTokensForTokens(amountIn, 0, [tokenToSpend,tokenToBuy], sender_address, (int(time.time()) + 1000000)).buildTransaction({
File "C:UsersOwnerDocumentsBlockchainPylibsitepackagesweb3contract.py", line 876, in __call__clone._set_function_info()
File "C:UsersOwnerDocumentsBlockchainPylibsitepackagesweb3contract.py", line 881, in _set_function_info
self.abi = find_matching_fn_abi(
File "C:UsersOwnerDocumentsBlockchainPylibsite-packagesweb3_utilscontracts.py", line 127, in find_matching_fn_abi
function_candidates = pipe(abi, name_filter, arg_count_filter, encoding_filter)
File "cytoolz/functoolz.pyx", line 667, in cytoolz.functoolz.pipe
return c_pipe(data, funcs)
File "cytoolz/functoolz.pyx", line 642, in cytoolz.functoolz.c_pipe
data = func(data)
File "C:UsersOwnerDocumentsBlockchainPylibsite-packagesweb3_utilsabi.py", line 93, in filter_by_name
return [
File "C:UsersOwnerDocumentsBlockchainPylibsitepackagesweb3_utilsabi.py", line 99, in <listcomp> and abi['name'] == name
KeyError: 'name'
Answers:
Error shows problem in line 99 in file abi.py with key abi["name"] so I found this file (you have full path in error) and add print() before line 99 to see all abi used in this place
def filter_by_name(name: str, contract_abi: ABI) -> List[Union[ABIFunction, ABIEvent]]:
for abi in contract_abi:
print(abi)
print('---')
# ... rest ...
and it shows me
{'stateMutability': 'payable', 'type': 'amountOut'}
which doesn’t have "name": ... and this makes problem.
If you check panAbi = ... then you see this {'stateMutability': ...} at the end.
If I add ie."name": "" in this {'stateMutability': ...} in panAbi then it resolves problem but I don’t know what real name it should have.
Problem 2: in general, you don’t need to know any ABI, you can ask bscscan to return it for you.
This is the code (use the switch DEBUG to select between testnet and mainnet).
Set your BSC API key in place of bscAPIkey
import requests
import json
def GetABI (Address):
if DEBUG:
url_eth = "https://api-testnet.bscscan.com/api"
headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.76 Safari/537.36'} # This is chrome, you can set whatever browser you like
API_ENDPOINT = url_eth+"?module=contract&action=getabi&address="+str(Address)+"&apikey="+bscAPIkey
resp = requests.get(url = API_ENDPOINT, headers=headers)
else:
url_eth = "https://api.bscscan.com/api"
API_ENDPOINT = url_eth+"?module=contract&action=getabi&address="+str(Address)+"&apikey="+bscAPIkey
resp = requests.get(url = API_ENDPOINT)
res = json.loads(resp.text)
status = int(res['status'])
if status:
response = resp.json()
abi=json.loads(response["result"])
return abi
else:
return False
Here’s how i fix it:
contract_abi = json.loads('[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address","name":"_factory","internalType":"address"},{"type":"address","name":"_WETH","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"WETH","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountA","internalType":"uint256"},{"type":"uint256","name":"amountB","internalType":"uint256"},{"type":"uint256","name":"liquidity","internalType":"uint256"}],"name":"addLiquidity","inputs":[{"type":"address","name":"tokenA","internalType":"address"},{"type":"address","name":"tokenB","internalType":"address"},{"type":"uint256","name":"amountADesired","internalType":"uint256"},{"type":"uint256","name":"amountBDesired","internalType":"uint256"},{"type":"uint256","name":"amountAMin","internalType":"uint256"},{"type":"uint256","name":"amountBMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256","name":"amountToken","internalType":"uint256"},{"type":"uint256","name":"amountETH","internalType":"uint256"},{"type":"uint256","name":"liquidity","internalType":"uint256"}],"name":"addLiquidityETH","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"amountTokenDesired","internalType":"uint256"},{"type":"uint256","name":"amountTokenMin","internalType":"uint256"},{"type":"uint256","name":"amountETHMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"factory","inputs":[]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"}],"name":"getAmountIn","inputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"},{"type":"uint256","name":"reserveIn","internalType":"uint256"},{"type":"uint256","name":"reserveOut","internalType":"uint256"}]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"}],"name":"getAmountOut","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"uint256","name":"reserveIn","internalType":"uint256"},{"type":"uint256","name":"reserveOut","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"getAmountsIn","inputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"getAmountsOut","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"}]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"amountB","internalType":"uint256"}],"name":"quote","inputs":[{"type":"uint256","name":"amountA","internalType":"uint256"},{"type":"uint256","name":"reserveA","internalType":"uint256"},{"type":"uint256","name":"reserveB","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountA","internalType":"uint256"},{"type":"uint256","name":"amountB","internalType":"uint256"}],"name":"removeLiquidity","inputs":[{"type":"address","name":"tokenA","internalType":"address"},{"type":"address","name":"tokenB","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountAMin","internalType":"uint256"},{"type":"uint256","name":"amountBMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountToken","internalType":"uint256"},{"type":"uint256","name":"amountETH","internalType":"uint256"}],"name":"removeLiquidityETH","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountTokenMin","internalType":"uint256"},{"type":"uint256","name":"amountETHMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountETH","internalType":"uint256"}],"name":"removeLiquidityETHSupportingFeeOnTransferTokens","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountTokenMin","internalType":"uint256"},{"type":"uint256","name":"amountETHMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountToken","internalType":"uint256"},{"type":"uint256","name":"amountETH","internalType":"uint256"}],"name":"removeLiquidityETHWithPermit","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountTokenMin","internalType":"uint256"},{"type":"uint256","name":"amountETHMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"},{"type":"bool","name":"approveMax","internalType":"bool"},{"type":"uint8","name":"v","internalType":"uint8"},{"type":"bytes32","name":"r","internalType":"bytes32"},{"type":"bytes32","name":"s","internalType":"bytes32"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountETH","internalType":"uint256"}],"name":"removeLiquidityETHWithPermitSupportingFeeOnTransferTokens","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountTokenMin","internalType":"uint256"},{"type":"uint256","name":"amountETHMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"},{"type":"bool","name":"approveMax","internalType":"bool"},{"type":"uint8","name":"v","internalType":"uint8"},{"type":"bytes32","name":"r","internalType":"bytes32"},{"type":"bytes32","name":"s","internalType":"bytes32"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountA","internalType":"uint256"},{"type":"uint256","name":"amountB","internalType":"uint256"}],"name":"removeLiquidityWithPermit","inputs":[{"type":"address","name":"tokenA","internalType":"address"},{"type":"address","name":"tokenB","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountAMin","internalType":"uint256"},{"type":"uint256","name":"amountBMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"},{"type":"bool","name":"approveMax","internalType":"bool"},{"type":"uint8","name":"v","internalType":"uint8"},{"type":"bytes32","name":"r","internalType":"bytes32"},{"type":"bytes32","name":"s","internalType":"bytes32"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapETHForExactTokens","inputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapExactETHForTokens","inputs":[{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"payable","outputs":[],"name":"swapExactETHForTokensSupportingFeeOnTransferTokens","inputs":[{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapExactTokensForETH","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"swapExactTokensForETHSupportingFeeOnTransferTokens","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapExactTokensForTokens","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"swapExactTokensForTokensSupportingFeeOnTransferTokens","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapTokensForExactETH","inputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"},{"type":"uint256","name":"amountInMax","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapTokensForExactTokens","inputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"},{"type":"uint256","name":"amountInMax","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"receive","stateMutability":"payable"}]')
# Every entry in ABI must have "name" attribute! Otherwise web3.py will fail when you call contract.functions.swapExactETHForTokens(1, [my_wallet_address], my_wallet_address, deadline)
i : int = 0
for entry in contract_abi:
if 'name' not in entry:
entry['name'] = f"dummy_name_{i}"
i = i+1
I’m trying to buy tokens using the swapExactTokensForTokens() Pancakeswap Router function), web3 imported in Python.
Problem 1: I keep getting an abi KeyError: ‘name’. Here’s my code and error below. I’m not sure how to handle this error.
problem 2: Is it possible to call the abi of a token without hardcoding it like I did below?
Code:
from web3 import Web3
import json
import key
import time
bsc = "https://bsc-dataseed.binance.org/"
web3 = Web3(Web3.HTTPProvider(bsc))
print(web3.isConnected())
print("Block Number: ", web3.eth.blockNumber)
#My wallet address
sender_address = '0x111111111111111111111111111111111111'
#Pancakeswap router address instantiate and ABI code
panRouterContractAddress = '0x10ED43C718714eb63d5aA57B78B54704E256024E'
panAbi = '[{"inputs":[{"internalType":"address","name":"_factory","type":"address"},{"internalType":"address","name":"_WETH","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"WETH","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"},{"internalType":"uint256","name":"amountADesired","type":"uint256"},{"internalType":"uint256","name":"amountBDesired","type":"uint256"},{"internalType":"uint256","name":"amountAMin","type":"uint256"},{"internalType":"uint256","name":"amountBMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"addLiquidity","outputs":[{"internalType":"uint256","name":"amountA","type":"uint256"},{"internalType":"uint256","name":"amountB","type":"uint256"},{"internalType":"uint256","name":"liquidity","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountTokenDesired","type":"uint256"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"addLiquidityETH","outputs":[{"internalType":"uint256","name":"amountToken","type":"uint256"},{"internalType":"uint256","name":"amountETH","type":"uint256"},{"internalType":"uint256","name":"liquidity","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"factory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"reserveIn","type":"uint256"},{"internalType":"uint256","name":"reserveOut","type":"uint256"}],"name":"getAmountIn","outputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"reserveIn","type":"uint256"},{"internalType":"uint256","name":"reserveOut","type":"uint256"}],"name":"getAmountOut","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"}],"name":"getAmountsIn","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"}],"name":"getAmountsOut","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountA","type":"uint256"},{"internalType":"uint256","name":"reserveA","type":"uint256"},{"internalType":"uint256","name":"reserveB","type":"uint256"}],"name":"quote","outputs":[{"internalType":"uint256","name":"amountB","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountAMin","type":"uint256"},{"internalType":"uint256","name":"amountBMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"removeLiquidity","outputs":[{"internalType":"uint256","name":"amountA","type":"uint256"},{"internalType":"uint256","name":"amountB","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"removeLiquidityETH","outputs":[{"internalType":"uint256","name":"amountToken","type":"uint256"},{"internalType":"uint256","name":"amountETH","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"removeLiquidityETHSupportingFeeOnTransferTokens","outputs":[{"internalType":"uint256","name":"amountETH","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"bool","name":"approveMax","type":"bool"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"removeLiquidityETHWithPermit","outputs":[{"internalType":"uint256","name":"amountToken","type":"uint256"},{"internalType":"uint256","name":"amountETH","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"bool","name":"approveMax","type":"bool"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"removeLiquidityETHWithPermitSupportingFeeOnTransferTokens","outputs":[{"internalType":"uint256","name":"amountETH","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountAMin","type":"uint256"},{"internalType":"uint256","name":"amountBMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"bool","name":"approveMax","type":"bool"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"removeLiquidityWithPermit","outputs":[{"internalType":"uint256","name":"amountA","type":"uint256"},{"internalType":"uint256","name":"amountB","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapETHForExactTokens","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactETHForTokens","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactETHForTokensSupportingFeeOnTransferTokens","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactTokensForETH","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactTokensForETHSupportingFeeOnTransferTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactTokensForTokens","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactTokensForTokensSupportingFeeOnTransferTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMax","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapTokensForExactETH","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMax","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapTokensForExactTokens","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"amountOut"}]'
contract = web3.eth.contract(address=panRouterContractAddress, abi=panAbi)
#Spend token instantiate and ABI
tokenToSpend = web3.toChecksumAddress("0xe9e7CEA3DedcA5984780Bafc599bD69ADd087D56") #Contract address for purchase currency (BUSD)
spendAbi = '[{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"constant":true,"inputs":[],"name":"_decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"_name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"_symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]'
spendTokenContract = web3.eth.contract(tokenToSpend, abi=spendAbi) #Spend token instance
#Contract address of token and amount to purchase
tokenToBuy = web3.toChecksumAddress(input("Enter Token Address to buy: "))
#Input contract address for the token to purchase
amountIn = web3.toWei(input("How much to spend? "), 'ether')
#Amount of purchase currency to spend
#Trade execution (To accomodate fees, use the function: swapExactTokensForTokensSupportingFeeOnTransferTokens)
pancakeswap2_txn = contract.functions.swapExactTokensForTokens(amountIn, 0, [tokenToSpend,tokenToBuy], sender_address, (int(time.time()) + 1000000)).buildTransaction({
'from': sender_address,
'value': amountIn,
'gas': 250000,
'gasPrice': web3.toWei('5','gwei'),
'nonce': web3.eth.get_transaction_count(sender_address),
})
signed_txn = web3.eth.account.sign_transaction(pancakeswap2_txn, private_key=key.private)
tx_token = web3.eth.send_raw_transaction(signed_txn.rawTransaction)
print("Success!: " + web3.toHex(tx_token))
Error:
True
Block Number: 9762322
Enter Token Address to buy: 0x0e09fabb73bd3ade0a17ecc321fd13a19e81ce82
How much BUSD to spend? 1
Traceback (most recent call last):
File "c:/Users/Owner/Documents/BlockchainPy/MyCodes/test.py", line 30, in <module>
pancakeswap2_txn = contract.functions.swapExactTokensForTokens(amountIn, 0, [tokenToSpend,tokenToBuy], sender_address, (int(time.time()) + 1000000)).buildTransaction({
File "C:UsersOwnerDocumentsBlockchainPylibsitepackagesweb3contract.py", line 876, in __call__clone._set_function_info()
File "C:UsersOwnerDocumentsBlockchainPylibsitepackagesweb3contract.py", line 881, in _set_function_info
self.abi = find_matching_fn_abi(
File "C:UsersOwnerDocumentsBlockchainPylibsite-packagesweb3_utilscontracts.py", line 127, in find_matching_fn_abi
function_candidates = pipe(abi, name_filter, arg_count_filter, encoding_filter)
File "cytoolz/functoolz.pyx", line 667, in cytoolz.functoolz.pipe
return c_pipe(data, funcs)
File "cytoolz/functoolz.pyx", line 642, in cytoolz.functoolz.c_pipe
data = func(data)
File "C:UsersOwnerDocumentsBlockchainPylibsite-packagesweb3_utilsabi.py", line 93, in filter_by_name
return [
File "C:UsersOwnerDocumentsBlockchainPylibsitepackagesweb3_utilsabi.py", line 99, in <listcomp> and abi['name'] == name
KeyError: 'name'
Error shows problem in line 99 in file abi.py with key abi["name"] so I found this file (you have full path in error) and add print() before line 99 to see all abi used in this place
def filter_by_name(name: str, contract_abi: ABI) -> List[Union[ABIFunction, ABIEvent]]:
for abi in contract_abi:
print(abi)
print('---')
# ... rest ...
and it shows me
{'stateMutability': 'payable', 'type': 'amountOut'}
which doesn’t have "name": ... and this makes problem.
If you check panAbi = ... then you see this {'stateMutability': ...} at the end.
If I add ie."name": "" in this {'stateMutability': ...} in panAbi then it resolves problem but I don’t know what real name it should have.
Problem 2: in general, you don’t need to know any ABI, you can ask bscscan to return it for you.
This is the code (use the switch DEBUG to select between testnet and mainnet).
Set your BSC API key in place of bscAPIkey
import requests
import json
def GetABI (Address):
if DEBUG:
url_eth = "https://api-testnet.bscscan.com/api"
headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.76 Safari/537.36'} # This is chrome, you can set whatever browser you like
API_ENDPOINT = url_eth+"?module=contract&action=getabi&address="+str(Address)+"&apikey="+bscAPIkey
resp = requests.get(url = API_ENDPOINT, headers=headers)
else:
url_eth = "https://api.bscscan.com/api"
API_ENDPOINT = url_eth+"?module=contract&action=getabi&address="+str(Address)+"&apikey="+bscAPIkey
resp = requests.get(url = API_ENDPOINT)
res = json.loads(resp.text)
status = int(res['status'])
if status:
response = resp.json()
abi=json.loads(response["result"])
return abi
else:
return False
Here’s how i fix it:
contract_abi = json.loads('[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address","name":"_factory","internalType":"address"},{"type":"address","name":"_WETH","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"WETH","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountA","internalType":"uint256"},{"type":"uint256","name":"amountB","internalType":"uint256"},{"type":"uint256","name":"liquidity","internalType":"uint256"}],"name":"addLiquidity","inputs":[{"type":"address","name":"tokenA","internalType":"address"},{"type":"address","name":"tokenB","internalType":"address"},{"type":"uint256","name":"amountADesired","internalType":"uint256"},{"type":"uint256","name":"amountBDesired","internalType":"uint256"},{"type":"uint256","name":"amountAMin","internalType":"uint256"},{"type":"uint256","name":"amountBMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256","name":"amountToken","internalType":"uint256"},{"type":"uint256","name":"amountETH","internalType":"uint256"},{"type":"uint256","name":"liquidity","internalType":"uint256"}],"name":"addLiquidityETH","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"amountTokenDesired","internalType":"uint256"},{"type":"uint256","name":"amountTokenMin","internalType":"uint256"},{"type":"uint256","name":"amountETHMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"factory","inputs":[]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"}],"name":"getAmountIn","inputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"},{"type":"uint256","name":"reserveIn","internalType":"uint256"},{"type":"uint256","name":"reserveOut","internalType":"uint256"}]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"}],"name":"getAmountOut","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"uint256","name":"reserveIn","internalType":"uint256"},{"type":"uint256","name":"reserveOut","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"getAmountsIn","inputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"getAmountsOut","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"}]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"amountB","internalType":"uint256"}],"name":"quote","inputs":[{"type":"uint256","name":"amountA","internalType":"uint256"},{"type":"uint256","name":"reserveA","internalType":"uint256"},{"type":"uint256","name":"reserveB","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountA","internalType":"uint256"},{"type":"uint256","name":"amountB","internalType":"uint256"}],"name":"removeLiquidity","inputs":[{"type":"address","name":"tokenA","internalType":"address"},{"type":"address","name":"tokenB","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountAMin","internalType":"uint256"},{"type":"uint256","name":"amountBMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountToken","internalType":"uint256"},{"type":"uint256","name":"amountETH","internalType":"uint256"}],"name":"removeLiquidityETH","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountTokenMin","internalType":"uint256"},{"type":"uint256","name":"amountETHMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountETH","internalType":"uint256"}],"name":"removeLiquidityETHSupportingFeeOnTransferTokens","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountTokenMin","internalType":"uint256"},{"type":"uint256","name":"amountETHMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountToken","internalType":"uint256"},{"type":"uint256","name":"amountETH","internalType":"uint256"}],"name":"removeLiquidityETHWithPermit","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountTokenMin","internalType":"uint256"},{"type":"uint256","name":"amountETHMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"},{"type":"bool","name":"approveMax","internalType":"bool"},{"type":"uint8","name":"v","internalType":"uint8"},{"type":"bytes32","name":"r","internalType":"bytes32"},{"type":"bytes32","name":"s","internalType":"bytes32"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountETH","internalType":"uint256"}],"name":"removeLiquidityETHWithPermitSupportingFeeOnTransferTokens","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountTokenMin","internalType":"uint256"},{"type":"uint256","name":"amountETHMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"},{"type":"bool","name":"approveMax","internalType":"bool"},{"type":"uint8","name":"v","internalType":"uint8"},{"type":"bytes32","name":"r","internalType":"bytes32"},{"type":"bytes32","name":"s","internalType":"bytes32"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountA","internalType":"uint256"},{"type":"uint256","name":"amountB","internalType":"uint256"}],"name":"removeLiquidityWithPermit","inputs":[{"type":"address","name":"tokenA","internalType":"address"},{"type":"address","name":"tokenB","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountAMin","internalType":"uint256"},{"type":"uint256","name":"amountBMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"},{"type":"bool","name":"approveMax","internalType":"bool"},{"type":"uint8","name":"v","internalType":"uint8"},{"type":"bytes32","name":"r","internalType":"bytes32"},{"type":"bytes32","name":"s","internalType":"bytes32"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapETHForExactTokens","inputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapExactETHForTokens","inputs":[{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"payable","outputs":[],"name":"swapExactETHForTokensSupportingFeeOnTransferTokens","inputs":[{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapExactTokensForETH","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"swapExactTokensForETHSupportingFeeOnTransferTokens","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapExactTokensForTokens","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"swapExactTokensForTokensSupportingFeeOnTransferTokens","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapTokensForExactETH","inputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"},{"type":"uint256","name":"amountInMax","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapTokensForExactTokens","inputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"},{"type":"uint256","name":"amountInMax","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"receive","stateMutability":"payable"}]')
# Every entry in ABI must have "name" attribute! Otherwise web3.py will fail when you call contract.functions.swapExactETHForTokens(1, [my_wallet_address], my_wallet_address, deadline)
i : int = 0
for entry in contract_abi:
if 'name' not in entry:
entry['name'] = f"dummy_name_{i}"
i = i+1