Web3.py is a library for interacting with EVM based blockchains and smart contracts in Python.
For more information see Web3.py documentation.
Web3.py is maintained by Ethereum Foundation.
Questions tagged [web3py]
578 questions
2
votes
1 answer
How to import web3 into pyscript?
Im new to pyscript and i wan to use web3.py in my index page
This here is my index.html page
- web3
import web3
bsc = 'https://bsc-dataseed.binance.org/'
web3 =…
An droid
- 47
- 5
2
votes
2 answers
get amount of tokens in a transaction from Txn Hash using Web3
Following the web3 documentation https://web3py.readthedocs.io/en/stable/examples.html#looking-up-transactions , I can get the transaction information like i have done below.
But it seems like i cant get the exact amount of token swapped in the…
Soma Juice
- 369
- 1
- 11
2
votes
0 answers
How to get decode raw text stored in ethereum blockchain using contract
contract Simplestorage {
string data;
function store(string memory _data) public {
data = _data;
}
function retrieve() public view returns (string memory) {
return data;
}
}
For the store function i given input…
Naresh Muthumula
- 21
- 1
2
votes
1 answer
How to call contract public variable using web3py?
I tried to call solidity smart contract public variable using python web3.
But when I called, it didn't work and showed the error: 500 (Internal Server Error).
Code summary is like this:
smart contract part:
pragma solidity ^0.8.7;
...
contract…
AlexSakai06
- 140
- 5
- 11
2
votes
1 answer
Waiting for transaction confirmation using web3.py?
I am sending a transaction using:
sign_txn = web3.eth.account.signTransaction(token_tx, private_key=private_key)
tx_hash = web3.eth.sendRawTransaction(sign_txn.rawTransaction)
and I want to wait for the confirmation of the transaction to continue…
Wade
- 21
- 5
2
votes
1 answer
Solidity "require" error message in Python
I am having trouble displaying the error message from the smart contract's require method in my Python console. I am using the web3.py module to interact with the contract.
Here is the smart contract code:
function burn(uint258 amount) public…
Synodinos Tavagios
- 41
- 7
2
votes
1 answer
web3py with 0x API
I have been trying to perform a swap on Ropsten using the 0x API to get the best quote but every time I try to perform a swap the transaction fails without any feedback(at least from Etherscan) while the approve tx goes through fine.
I am probably…
icelandnode
- 21
- 2
2
votes
1 answer
how to find the creation block_number for a given contract_address using web3.py?
I was trying to find the creation block number using contract address , is there is a way to find creation block number when a contract address is deployed using web3.py?
Kavita Joshi
- 21
- 2
2
votes
0 answers
Not able to install ganache; getting and NPM in power shell
I got ran into an error when I ran npm install ganache --global.
PS C:\Users\Chetachi Ugwu-Ojobe\Documents\projects\Learning Solidity\Demos> npm install ganache --global npm WARN cleanup Failed to remove some directories [ npm WARN cleanup [ npm…
ikpe
- 39
- 1
2
votes
1 answer
How to check your wallet's share of the liquidity pool (uniswap or quickswap) using web3
How can i check my wallet's share of the uniswap/quickswap liquidity pool using web3py ?
The objective is to check what is my indirect token A and token B position and also if possible the rewards pending for my wallet ? While debank can help, I…
Danny D
- 23
- 2
2
votes
1 answer
Trying to add liquidity on uniswap v3 via web3py
I'm trying this code on Ropsten, it but keeps failing:
contract_instance = w3.eth.contract(address="0xC36442b4a4522E871399CD717aBDD847Ab11FE88", abi=liq_ABI)
tx_hash = contract_instance.functions.mint(
(
…
Kujokaren
- 21
- 2
2
votes
2 answers
pip install web3 | error: Microsoft Visual C++ 14.0 or greater is required
when i run this command : pip install web3
i get this error
error: Microsoft Visual C++ 14.0 or greater is required. Get it with "Microsoft C++ Build Tools": https://visualstudio.microsoft.com/visual-cpp-build-tools/
but i have already the…
Ryuu Potato
- 39
- 2
- 6
2
votes
0 answers
What real EIP-1559 base fee on polygon chain?
When I call the fee_history method from the web3 library, the polygon node returns a non-null EIP-1559 base fee. However, on https://polygonscan.com/gastracker we see a base fee equal to 0. Same on https://polygonscan.com/blocks.
Request on…
FRiMN
- 389
- 3
- 7
2
votes
0 answers
How do i get an Ethereum address in python starting from a v,r,s signature?
I am trying to get the address that signed the transaction below in Moonbeam EVM (a Polkadot EVM compatible parachain). By loading the contract ABI i am able to get the call parameters by doing this:
from web3 import Web3
w3 =…
JohnUopini
- 960
- 9
- 24
2
votes
1 answer
Why do I need parenthesis to access a Solidity contract variable in python?
inside a Solidity contract there is a declaration as follows:
contract Lottery is VRFConsumerBase, Ownable {
address payable[] public players;
...
...
elsewhere in the same contract,there is a an assignment as follows:
....
....
recentWinner =…
maskara
- 329
- 1
- 2
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