Questions tagged [python]

Python is a dynamic and strongly typed programming language designed to emphasize usability.

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Duplicate events from get_new_entries using web3.py

I'm struggling to understand how to properly poll events emitted from contracts. The provider I'm using is Infura. My code boils down to the following: filter = target_event.createFilter(fromBlock='...
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32 views

Known transaction error in Python3

I'm experimenting on an automatic ethereum wallet. But I have some problems. The first process is successful but it's error message the second process: Known transaction how do I solve this problem? ...
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3answers
469 views

Let's say I forgot first 2 words of the seed, how could I find an account with ether in it?

Let's say I forgot first 2 words of the seed. I want to write a program that brute-forces all possible bip-39 word combinations for the first 2 words, generate private/public keys, addresses, and go ...
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384 views

Detecting dropped and replaced transactions web3.py

I am using web3.py. Given a transaction hash, is there any way to determine if a transaction was dropped and replaced by another transaction with the same nonce? Currently i am looping w3.eth....
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604 views

Getting txpool with python web3 and infura

I am trying to monitor pending transactions with python web3 and an infura node. I am currently using web3.eth.getBlock(block_identifier='pending', full_transactions=True) on a loop to fetch pending ...
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1answer
33 views

Invisible transaction

I work in a Ropsten testnet. I have a Python application that sends a transaction and returns the transaction's txHash. It is possible to send a maximum of 500 transactions in one request. The ...
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1answer
63 views

Issues with using/installing python solidity parser

I am trying to install and use python solidity parser by ConsenSys I keep on getting the following error File "<stdin>", line 1, in <module> File "/home/seed/.local/lib/python3.5/site-...
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0answers
401 views

How to config geth node to get ERC-20 tokens balances

I'm trying to tune my geth node to get ERC-20 tokens balances, but y API call always returns {'jsonrpc': '2.0', 'id': 1, 'result': '0x'} My geth node version: instance=Geth/v1.9.13-stable-cbc4ac26/...
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80 views

Sign Message using passphrase only

I'm creating an authentication system using python and web3.py. I'm trying to authenticate a user using from web3.auto import w3 msg = 'sdb41554xcb4xc548cxd84dxcb' message = encode_defunct(text=...
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1answer
867 views

How to listen contract event in Python

The test contract is pragma solidity ^0.5.0; contract Test{ event Here(uint256 indexed a); uint256 public a; function add() public returns (uint256){ a += 1; emit Here(...
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142 views

How to make ECDSA signature of (value_1, value_2) with web3 on Python?

I want to call function with four parameters. I know how to create two of them, but the last two is the r and s components of ECDSA signature of (param_1, param_2). I tried this (and a lot of ...
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1answer
598 views

How to deploy contract with local private key?

I am trying to deploy my contract onto the blockchain in my private network with local private key (no wallet: I used web3.auto.w3.account.create()). I know how to send normal transaction with local ...
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1answer
691 views

Ethereum Token: How to decide gas price and gas limit using token transaction?

I made ERC20 token. And I am going to implement to send token using web3.py. Here I want to calculate gas price and gas limit using token transaction. If anyone know about that, please help me. ...
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1answer
124 views

How to send transaction using ethereum contract?

I made ethereum contract according to sample code. And then generated ethereum wallet. The abstract contract is as follow. pragma solidity ^0.4.18; /** * @title ERC20Basic * @dev Simpler version ...
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384 views

pywallet: Which is the private key of child wallet?

Using pywallet, I have developed ethereum wallet under following code. seed = wallet.generate_mnemonic() wallet_info = wallet.create_wallet(network=network, seed=seed, children=0) In this case ...
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1answer
2k views

Web3.py transact works but call doesn't

I am trying to call a fairly simple contract on a private blockchain: function getOwner() public returns (address) { return owner; } And here is my running it from an interactive Python shell: &...
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1answer
257 views

How to sign a simple transfer TX with digitalbitbox python api

I'm trying to sign a simple transfer transaction using digitalbitbox's python api (see here and code snippet below). I send the following json to the HW wallet api: Sending: {"sign":{"data":[{"...
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1answer
961 views

Problem with sha3.keccak_256() update method in Python

I made a simple SHA3 Python script to generate Ethereum addresses and priv/pub keys. After that I sent some ETH to those addresses but then found out that priv keys do not correspond to the addresses ...
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1answer
243 views

Python3, Populus installed but not working, deprecation

Populus was functioning well until I began getting deprecation warnings. So I did pip uninstall populus and then pip3 install populus. Also installed all required python3 libraries. The install worked ...
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1answer
592 views

Code in Python-smart contract

I like to code smart contracts using python for my project. I done a project using Flask web framework in python. I like to implement the same project in ethereum block chain. Where can I learn the ...
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2answers
193 views

Installation of pyethapp fails on Raspberry Pi

I'm trying to install pyethapp on Raspberry PI B+ sudo pip install pyethapp getting error Complete output from command python setup.py egg_info: Couldn't find index page for 'pytest-runner' (maybe ...

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