This page uses machine translation from English, which may contain errors or unclear language. For the most accurate information, please see the original English version. Some content may be in the original English due to frequent updates. Help us improve this page's translation by joining our effort on Crowdin. (Crowdin translation page, Contributing guide)

Getting-started

Install

Need to install Python 3.7.2+ first

Make example directory

> mkdir web3py-ext-examples & cd _$

Set python virtual environment (preferable but optional)

> python -m venv .venv

> . ./.venv/bin/activate

Install

> pip install web3py-ext

Start

Create file

fee-delegated-value-transfer.py

from web3py_ext import extend

from web3 import Web3

from eth_account import Account

from web3py_ext.transaction.transaction import (

fill_transaction,

TX_TYPE_FEE_DELEGATED_VALUE_TRANSFER

)

from web3py_ext.utils.klaytn_utils import to_pretty

w3 = Web3(Web3.HTTPProvider('https://public-en-kairos.node.kaia.io'))

def web3_fee_delegated_value_transfer():

user = Account.from_key('0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8')

fee_delegator = Account.from_key('0x9435261ed483b6efa3886d6ad9f64c12078a0e28d8d80715c773e16fc000cff4')

fee_delegated_value_transfer_tx = empty_tx(TX_TYPE_FEE_DELEGATED_VALUE_TRANSFER)

fee_delegated_value_transfer_tx = merge(fee_delegated_value_transfer_tx, {

'from' : user.address,

'to' : user.address, # to feepayer

'value' : Web3.to_peb(0.1, 'klay'),

})

fee_delegated_value_transfer_tx = fill_transaction(fee_delegated_value_transfer_tx, w3)

# sign the kaia specific transaction type with web3py

signed_tx = Account.sign_transaction(fee_delegated_value_transfer_tx, user.key)

feepayer_signed_tx = Account.sign_transaction_as_feepayer(signed_tx.rawTransaction, fee_delegator.address, fee_delegator.key)

decoded_tx = Account.decode_transaction(feepayer_signed_tx.rawTransaction)

print("\ndecoded transaction:", to_pretty(decoded_tx))

tx_hash = w3.eth.send_raw_transaction(feepayer_signed_tx.rawTransaction)

tx_receipt = w3.eth.wait_for_transaction_receipt(tx_hash)

print('tx hash: ', tx_hash, 'receipt: ', tx_receipt)

web3_fee_delegated_value_transfer()

Run

> python fee-delegated-value-transfer.py

Output

decoded transaction: {

"type": 9,

"to": "0xA2a8854b1802D8Cd5De631E690817c253d6a9153",

"value": 100000000000000000,

"nonce": 43,

"gasPrice": 50000000000,

"gas": 63000,

"from": "0xA2a8854b1802D8Cd5De631E690817c253d6a9153",

"feePayer": "0xCb0eb737dfda52756495A5e08A9b37AAB3b271dA",

"signatures": [

{

"v": 2037,

"r": 93578354654414740427739002022919644896409290347939533211703795054759757354902,

"s": 9134800547522066540800971891951614240623136207355204747806684032906366307747

}

],

"feePayerSignatures": [

{

"v": 2038,

"r": 20302025172377290126887017758452014810405132492378310771239790273428447745777,

"s": 53258287859492498716919703834973997323471810974924373733878093996195872661689

}

],

"chainId": 1001

}

tx hash: 0x205430ddd219681f4e1657b46aafa104609210d686554dfae8653eb22295d953 receipt: AttributeDict({'blockHash': HexBytes('0x584ad0ac61625084509403db672087fac9e3967f09d5d4a7f96087f821848c77'), 'blockNumber': 126525583, 'contractAddress': None, 'cumulativeGasUsed': 31000, 'effectiveGasPrice': 25000000000, 'from': '0xA2a8854b1802D8Cd5De631E690817c253d6a9153', 'gasUsed': 31000, 'logs': [], 'logsBloom': HexBytes('0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'), 'status': 1, 'to': '0xA2a8854b1802D8Cd5De631E690817c253d6a9153', 'transactionHash': HexBytes('0x205430ddd219681f4e1657b46aafa104609210d686554dfae8653eb22295d953'), 'transactionIndex': 0, 'type': 0})