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
4
votes
2 answers
Web3 ExtraDataLength Error on the Binance Smart Chain using python
I'm trying to pull the transactions that took place on a specific block, and I get stuck here:
from web3 import Web3
bsc = "https://bsc-dataseed.binance.org/"
web3 = Web3(Web3.HTTPProvider(bsc))
block =…
swaggy pete
- 61
- 1
- 3
4
votes
3 answers
How to create a Web3py account using mnemonic phrase
I'm making my own desktop BSC wallet with web3. At the moment I'm using
private_key = "private key"
account = w3.eth.account.privateKeyToAccount(private_key)
But I want to create the account using a mnemonic phrase like "hello john pizza guitar". I…
ElAlien725
- 147
- 1
- 5
4
votes
2 answers
Sending raw transaction from web3py: TypeError: () missing 4 required positional arguments: 'hash', 'r', 's', and 'v'
I am trying to send raw transaction by web3py using this code:
t = w3.eth.account.sign_transaction(test_contract.functions.edit("test").buildTransaction(
{
"nonce": w3.eth.get_transaction_count(w3.eth.default_account)
}
),…
n1x
- 45
- 4
4
votes
1 answer
How do I get ethereum transactions?
I'm getting started to Ethereum and Web3py and I would like to get transactions happening whenever they happen on a specific address. In order to do this, I signed up to infura and got my project ID. So here is what I tried:
from web3 import…
Jack022
- 867
- 6
- 30
- 91
4
votes
2 answers
How to fix "the method txpool_inspect does not exist/is not available"
I'm having trouble getting the python function web3.geth.txpool.inspect() to work.
I've tried using a geth server from the command line, from the ethereum/client-go container, and from the trufflesuite/ganache-cli:v6.7.0 container.
In every case, I…
rotten
- 1,580
- 19
- 25
4
votes
1 answer
Web3.py HTTPProvider requests SSL certificates
Environment:
Corporate firewall
Problem:
When calling
w3 = Web3(Web3.HTTPProvider("https://ropsten.infura.io/v3/API_KEY"))
in web3.py, the request will be blocked by firewall with
SSLError("Can't connect to HTTPS URL because the SSL module is…
WQL
- 41
- 1
4
votes
2 answers
how to get event data from web3py?
pragma solidity ^0.4.17
contract Test {
event greeting(string name);
function say() pure public {
greeting('jack');
}
}
how to get the event data 'jack' when the say() function called in the python version web3.py? below is my…
hang
- 133
- 1
- 1
- 12
3
votes
2 answers
'Web3' object has no attribute 'isConnected'
I am trying to connect to the Ethereum blockchain with Web3. When I install web3 using jupyter notebook I keep receiving the error that Web3 has no attribute. Can someone please advise on how to get connected to the Ethereum network?
MY CODE:
pip…
newbiezz
- 31
- 2
3
votes
1 answer
Implementing web3-ethereum-defi to get the amount in an ethereum swap?
I'm trying to get the amount swapped in an ethereum transaction using the web3-ethereum-defi module.
link to documentation
And I can't get it implemented correctly:
from eth_defi.uniswap_v2 import analysis
web3 =…
helpme
- 95
- 6
3
votes
2 answers
How to check or know that a wallet has tokens in web3 python
I am trying to find out if its possible to know or check in python web3 if a certain bsc address has tokens or transactions.
I can check if an address has bnb or bsc transactions using nonce = web3.eth.getTransactionCount(address) but what I want to…
rbutrnz
- 383
- 4
- 20
3
votes
0 answers
Uniswap v2 getAmountsOut price for fractional value tokens
I want to get price of tokens like CAW, SHINJA, etc on blockchain and not using uniswap subgraph api.
router_contract_obj = w3.eth.contract(
address=Web3.toChecksumAddress(IUNISWAP_V2_ROUTER),
abi=router_contract_abi
)
prices = await…
AtiqGauri
- 1,483
- 13
- 26
3
votes
3 answers
Python Uniswap Subgraph - Constant product formula
I'm trying to calculate the price impact on trades and am getting strange results.
I am using uniswap v2 subgraph to get current data for WETH/USDC.
def loadUni2():
query = """
{
pairs (
first: 10
orderBy: volumeUSD
…
cryptotheo
- 151
- 1
- 7
3
votes
1 answer
Transferring ERC721 Tokens using Python/Web3.py
I can not for the life of me find any article on the entire interweb that talks about using web3.py to transfer ERC-721 tokens between wallets. Minting, yes all day long, airdrop yes all day long, but wallet to wallet transfer, nope. Am I missing…
donny90210
- 71
- 1
- 9
3
votes
1 answer
How to verify avalanche block is accepted with web3.py
I am trying to build a bot that listens to events on AMMs for various chains and I am running into issues when trying to build out my algorithm for the avalanche network. When calling the getLogs function for a particular event, the program will…
Matg
- 91
- 6
3
votes
4 answers
Python Web3 Ganache - Traceback error on BuildTransaction
I am going through the freeCodeCamp course on YouTube and have caught an error regarding when I run. As I am trying to build a transaction into Ganache. I see in Ganache logs that there is activity as well. First time posting, so let me know what…
Justin Cho
- 31
- 2