Python 3，以太坊 - 如何发送 ERC20 代币

Question

我有一些脚本用于将以太币从地址发送到地址。我使用Parity和Python 3.6。它使用烧瓶看起来像：

from flask import Flask, render_template, json, request
import urllib
import requests
import binascii
from decimal import *
app = Flask(__name__)
def Eth(method,params=[]):
    data = {"method":method,"params":params,"id":1,"jsonrpc":"2.0"}
    headers = {'Content-type': 'application/json'}
    r = requests.post(ethrpc, data=json.dumps(data), headers=headers)
    r = r.text
    response = json.loads(r)
    return(response)
hot = str("XXXXXXX")
@app.route('/')
def index():
    ethnumbers = int(10)**int(18)
    hot = str("XXXXX")
    balance = Eth("eth_getBalance",[hot,'latest'])
    balance = balance["result"]
    balance = int(balance, 16)
    balance = float(balance)
    balance = balance / ethnumbers
    balance = str(balance)
    return render_template('index.html',hot = hot,balance=balance)

@app.route('/send/',methods=['POST','GET'])
def send():
    getcontext().prec = 28
    ethnumbers = Decimal(10)**Decimal(18)
    print(ethnumbers)
    if request.method == "POST":    
        _myaddress = request.form['_myaddress']
        _youraddress = request.form['_youraddress']
        _amount = request.form['_amount']
        _gas = request.form['_gas']
        _gas = hex(int(_gas))
        passy = str("XXXXXXXXX")
        getcontext().prec = 28
        _amount = Decimal(_amount)
        getcontext().prec = 28
        _amount = _amount * ethnumbers
        getcontext().prec = 28
        _amount = int(_amount)
        _amount = hex(_amount)
        r = [{'from':_myaddress,"to":_youraddress,"value":_amount,"gas":_gas,},str("XXXXXXXXXX!")]
        print(r)
        json.dumps(r)
        resultio = Eth("personal_sendTransaction",r)
        try: 
            resultio["result"]
            return render_template('sent.html',resultio=resultio["result"])
        except: KeyError
        return render_template('sent.html',resultio=resultio["error"]["message"])
    else:
        return render_template('index.html')



if __name__ == "__main__":
    app.run()

我很确定，我必须使用"数据"来执行此操作，但我不知道如何通过此脚本发送 ERC20 令牌。代币交易的结构看起来像"我的地址->代币地址->代币接收器"。

有什么想法吗？

Answer 1

伙计们，它比看起来简单。你只需要把：

合约地址

作为接收方并创建一个长"数据"字段，它将字符串表示为：

// method name, its constans in erc20
0xa9059cbb
//receiver address (you have to do it without "0x" because its needed only when
//you have to tell "im using hexadecimal". You did it above, in method field.
//so, receiver address:
5b7b3b499fb69c40c365343cb0dc842fe8c23887
// and fill it with zeros, it have to be lenght 64. So fill rest of address 
0000000000000000000000005b7b3b499fb69c40c365343cb0dc842fe8c23887
// then you need amount, please convert it to hexadecimal, delete "0x" and 
// remember, you need to integer first, so if token has 18 "decimals" it need
// to be amount / 10**18 first!!
//1e27786570c272000 and fill that with zeros, like above:
000000000000000000000000000000000000000000000001e27786570c272000
//just add string, to string, to string, and you have data field: 
0xa9059cbb0000000000000000000000005b7b3b499fb69c40c365343cb0dc842fe8c23887000000000000000000000000000000000000000000000001e27786570c272000

交易示例：https://etherscan.io/tx/0x9c27df8af24e06edb819a8d7a380f548fad637de5edddd6155d15087d1619964

Answer 2

web3.py绝对是要走的路。如果你想手动完成，你只想调用标准的ERC-20 transfer方法，from地址应该保持不变，to地址应该是代币合约，然后data应该是下面的连接在一起并格式化为十六进制：

1. "transfer(address，uint256("的keccak256哈希的前4个字节，这是函数的签名。
2. 收件人的地址，左零填充为 32 字节。
3. 要转移的金额。(请务必考虑令牌的小数...1 个令牌通常是 10**18，但小数位数因令牌而异，可以通过调用 decimals() 函数来检索。这也应该格式化为 32 字节的数字(所以左零填充(。

web3.py会容易得多。像这样：

web3.eth.contract(address, abi=standard_token_abi).sendTransaction({
    'from': from_address
}).transfer(to_address, amount)