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新手指南

安装

需要先安装 Python 3.7.2+

创建示例目录

> mkdir web3py-ext-examples & cd _$

设置 python 虚拟环境（最好，但可选）

> python -m venv .venv

> ./.venv/bin/activate

安装

> pip install web3py-ext

开始

创建文件

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)

# 使用 web3py 签署 kaia 特定的交易类型

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(raw_transaction)。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()

运行

> python fee-delegated-value-transfer.py

输出

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})