Hello there, I have been trying to setup a swaptoken for pancake/uniswap for the few hours without success, been getting the following error.
And i have not been able to found example code to learn from, if anyone has some usefull resouce i would appreciate it a lot.
Could not identify the intended function with name `swapExactETHForTokensSupportingFeeOnTransferTokens`, positional argument(s) of type `(<class 'int'>, <class 'list'>, <class 'str'>, <class 'int'>)` and keyword argument(s) of type `{}`.
Found 1 function(s) with the name `swapExactETHForTokensSupportingFeeOnTransferTokens`: ['swapExactETHForTokensSupportingFeeOnTransferTokens(uint256,address[],address,uint256)']
Function invocation failed due to no matching argument types.And i have not been able to found example code to learn from, if anyone has some usefull resouce i would appreciate it a lot.
@notooth1 web3py requires knowledge of the address and abi. looks like etherscan has an API for verified contracts: https://etherscan.io/apis#contracts
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<marc> @notooth1 re: discord, you mightve forgotten to hit 'send', because a server search shows you entering and no further activity. re: pending txs of a specific contract, there's no native web3 api for this; youll need to filter through pending txs for items you care about. there may be a 3rd party API that can do this for you, not sure.
<marc> @notooth1 ah, if youve updated the question to be for all transactions, not pending, there's still a similar answer: no native api. its up to you parse each block for txs you care about. typically ppl will store what they need in some local db to avoid requerying, picking up from their most recent block queried. another typical way to get this sort of data is to filter for specific events you're interested in. a contributor recently added a robust example of a token transfer scanner here: https://web3py.readthedocs.io/en/latest/examples.html#advanced-example-fetching-all-token-transfer-events
Aargh! How should I decode transaction receipt logs? Especially when there's multiple log entries associated with different contracts and call functions. I can get each log entries ABI by address, and then reconstruct it from topics, etc. etc. But there s gots to be an easier way! Any tips? Thanks
On Web3js they have access to solidity decoders, but I think there's no such option in Web3py
@ilyasELBANI
2021-06-07 Buy Token on pancake
https://www.youtube.com/watch?v=4fRAuWHPCPE&t=192s&ab_channel=CodeWithJoeCodeWithJoe
https://github.com/CodeWithJoe2020/pancakeswapBot/blob/main/cakebot.py
https://github.com/CodeWithJoe2020/pancakeswapBot/blob/main/cakebot.py
2021-06-09 Sell Token on pancake
https://www.youtube.com/watch?v=ehWDvw0jMzo&ab_channel=CodeWithJoeCodeWithJoe
https://github.com/CodeWithJoe2020/sellTokenPancakeSwap/blob/main/sell.py
https://github.com/CodeWithJoe2020/sellTokenPancakeSwap/blob/main/sell.py
Hello everyone, just started using web3py. Can anyone help me with my problem here? https://ethereum.stackexchange.com/questions/102110/what-is-the-fastest-way-of-continuously-selling-portions-of-my-tokens-using-web3
Hello, How are you? I have some ask. Could you have to ask? I am using web3py to get the pending transactions. But I have an error like this. "Transaction with hash: {transaction_hash!r} not found." What does the main reason for this error?
I have some asks.
I am using web3py to get the pending transactions. But I have an error. Transaction with hash {transaction_hash} not found. @Eric and @Jason Carver ! Help me! I can't this an error. What does mean?
I just realized that with London, as transaction semantics change, this may break existing code dealing with transaction data - is Web3.py ready for London transactions?
2 replies
thank you
looking for a library I can use on an ESP32 board
I tried installing web3.py but it did not work. I think it is too big for the arduino board
@p-i-
Oh, hrm, one thing I did not expect is that all contract interactions on Ropsten are now broken due to London
on any
.call() I get ValueError: {'code': -32015, 'message': 'Transaction execution error.', 'data': 'GasPriceLowerThanBaseFee { gas_price: 0, base_fee: 151416558155 }'}
Do I need a build from the
london branch to get this to work?
I guess there is no way to get
london from pip so far, so I will need to figure out building manually? That surely will be even harder for our docker containers, but I need a solution today as we need to be able to continue doing some testing with Ropsten (and right now basically nothing works due to that error stated above)
correct, no web3.py
london via pip yet. i dont have much experience with docker, but cant you just build a branch by tacking on #branch-nameto the build source? also all dev was done against Geth since OE is getting sunset after london
I know it's going to be sunset, I hope Erigon will be ready enough once we need to actually switch. That said, I found my code works fine against Infura or Geth even with current web3.py that has no specific London support yet.
where we send them, ourselves, we send a gas price - but on Ropsten, blocks are usually not full and it shouldn't matter much if we send legacy or 1559 transactions