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ethereum/web3.py

https://web3py.readthedocs.io/

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removed verison check in __init… (compare)
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kclowes on master

Increase cache size (#2477) * … (compare)
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mintblock

@mintblock

I am using the abi and contract address but looking for an example to reference

Raphael Lullis

@lullis

Hello! I am wondering if there is any way that I can get the value of a transfer using only the information provided by a transaction receipt, or at least if there is any rule besides gasUsed == 21000 to indicate that a transaction is a ETH transfer?

Mikko Ohtamaa

@miohtama

@lullis no. Only for very simple cases. The receipt does not have any information about ETH or token transfers then happen between the smart contracts, on contract to contract calls. For these you need a full transaction trace. Ben Hauser, author of Brownie, can give tips on this one.

Ben Hauser

@iamdefinitelyahuman

thanks @miohtama :)

@lullis Brownie provides an object TransactionReceipt that can show you the return value from a broadcasted transaction.. it's available as TransactionReceipt.return_value - https://eth-brownie.readthedocs.io/en/stable/api-network.html#TransactionReceipt.return_value

for a more general overview of what you can do with TransactionReceipt - https://eth-brownie.readthedocs.io/en/stable/core-transactions.html

Raphael Lullis

@lullis

Thank you. It looks interesting, but it might be too much for what my immediate needs. I am building a a web app to work as a payment gateway, so at the moment all I care about is keeping track of ETH and ERC20 transfers.

Raphael Lullis

@lullis

I do have access to the transaction data along with the receipt already. I was just wondering if I could have my function that tracks transfers relying only on the receipt, but if I have to reconcile data from tx_data and tx_receipt, it's okay...

El De-dog-lo

@fubuloubu

web3py handles the stateMutability field in ABI, right?

mintblock

@mintblock

I am trying to submit a transaction to a smart contract. does anyone know what this error means? I googled, raised my gas amount and limit but no change. your help is appreciated... line 153, in request_blocking
raise ValueError(response["error"])
ValueError: {'code': -32000, 'message': 'gas required exceeds allowance (11964883) or always failing transaction'}

Mikko Ohtamaa

@miohtama

@mintblock It means there is an exception thrown by Solidity code - most likely require

if there is an error then the all available gas is consumed

El De-dog-lo

@fubuloubu

Is there any plans in v6 to properly implement handling for structs? (perhaps handling them as creating an ad-hoc NamedTuple for output, and then just querying attributes of any given input object)

El De-dog-lo

@fubuloubu

https://github.com/ethereum/web3.py/issues/1634#issuecomment-650797252

debugged a pretty insidious issue with the ABI decoder in web3py

Mikko Ohtamaa

@miohtama

@fubuloubu diving in the deep end!

Daniel Tong

@DanielTongAwesome

hi guys ~ just some questions about web3.py. I have a simple test contract, and I want to have a script locally to test out the interaction with smart contract

how do I set up the default account by using the private key

its pretty simple, but i am new to web3.py

Daniel Tong

@DanielTongAwesome

can someone show me how to link this transact with an account ?

Daniel Tong

@DanielTongAwesome

my assumption is i need to set up eth.defaultAccount = my private key account

how should i do that

Marc Garreau

@marcgarreau

@DanielTongAwesome w3.eth.defaultAccount = w3.eth.accounts[0], for example. its just the public address.

Daniel Tong

@DanielTongAwesome

oh but i am not using ganache

if I want to transact from my test wallet

how should i do that

Marc Garreau

@marcgarreau

Have you seen this page yet? https://web3py.readthedocs.io/en/stable/web3.eth.account.html

Daniel Tong

@DanielTongAwesome

thanks @marcgarreau

Marc Garreau

@marcgarreau

:+1:

Daniel Tong

@DanielTongAwesome

I made a contract transact through web3.py

but I encountered an error

https://ropsten.etherscan.io/tx/0x56e8b6e70bea94ccb9c76a036694768d0e3ce5ed182d742fc6dd900608802313

how to findout the reason why I got reverted

17 replies

Daniel Tong

@DanielTongAwesome

etherscan did not show detailed reason why it failed

Daniel Tong

@DanielTongAwesome

buildTransaction({
'chainId': 3,
'gas': 1000000,
'gasPrice': web3.toWei(30, 'gwei'),
'nonce': nonce,
})

here is how I set my gas and gasprice

Daniel Tong

@DanielTongAwesome

is that because of the uint256 ? cos I have one require uint 256

and when I call transact, i just put 1 there

Daniel Tong

@DanielTongAwesome

can anyone share me how to convert python integer to uint256?

I tried numpy -> np.uint32(1)

since uint256 -> 256 bits -> 32bytes

Marc Garreau

@marcgarreau

web3.py doesnt yet support parsing the revert reason, though there is some work in progress there. In general, though, this isn’t the best place to get help with debugging solidity contracts. (I’m not actually sure where the best place for that is — suggestions from the peanut gallery are welcome.) What I will recommend is writing some unit tests for your contract, so you can rapidly try out your ideas and have more confidence in the inputs and outputs. Brownie might be a good tool to guide you there.

Daniel Tong

@DanielTongAwesome

thanks ~ i already had some unit test code, but its my first time to try web3.py

I mostly do it with js

thanks for ur help

the unit test in python looks cool I will try that as well

thanks

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