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使用python 调用 defi 函数

安装 web3 py

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pip install web3

连接节点的最常用方法是

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1.IPC(使用本地文件系统:最快,最安全)
2.Websockets(远程工作,比 HTTP 更快,但一般只有私人节点开发)
3.HTTP(更多节点支持它)

具体的参考资料网上很多

合约调用代码demo

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"""
swap 合约 新币抢链机器人
"""
import json
import requests
from web3 import Web3

import time


def getAbi(contract_address):
"""
:param contract_address: 合约地址
"""
url_scan = "https://api.bscscan.com/api?module=contract&action=getabi&address=" + str(contract_address)
r = requests.get(url=url_scan)
response = r.json()
abi = json.loads(response["result"])
return abi


# 交换虚拟货币
def swap():
contract_address = web3.toChecksumAddress(router_contract_address)
contract = web3.eth.contract(address=contract_address,
abi=contract_abi)
# 交易对
pair = [token_in, token_out]
amounts = contract.functions.getAmountsOut(amount_in, pair).call()
amount_out_min = amounts[1] * (1 - slippage)
if amount_out_min < min_buy_token_amount:
print("目前能买到的币数量为: {0},最小购买的币数量为: {1},已经小于最小购买数量".format(amount_out_min, min_buy_token_amount))
return
# 开始交易
txn = contract.functions.swapExactTokensForTokens(
amount_in,
amount_out_min,
pair,
# 接收人的币种地址
address,
(int(time.time()) + 10000)
).buildTransaction({
'chainId': 56,
'from': address,
# 手续费根据需要加大
'gas': gas,
'gasPrice': web3.eth.gasPrice,
'nonce': nonce,
})
signed_txn = web3.eth.account.sign_transaction(txn, private_key=private_key)
tx_token = web3.eth.send_raw_transaction(signed_txn.rawTransaction)
print("swap token tx is {0}".format(web3.toHex(tx_token)))


if __name__ == '__main__':
# 币安的写成币安的地址
url = "https://bsc-dataseed1.binance.org"
web3 = Web3(Web3.HTTPProvider(url))
# pancake 智能合约
router_contract_address = "0x10ED43C718714eb63d5aA57B78B54704E256024E"
# 钱包私钥信息
private_key = ""
# 钱包地址
address = web3.toChecksumAddress("")
# 发送的币种信息
send_token_address = "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c"
# 交易的币种信息
buy_token_address = "0xfbb4f2f342c6daab63ab85b0226716c4d1e26f36"
# 交易的币数量
send_token_amount = 0.3
# 最小买入金额
min_buy_token_amount = 2000
# 燃烧的gas 费
gas = 7000000
# 间隔时间
split_second = 5
# 滑点 0.5 = 50%
slippage = 0.5

amount_in = Web3.toWei(send_token_amount, 'ether')
token_in = Web3.toChecksumAddress(send_token_address)
token_out = Web3.toChecksumAddress(buy_token_address)
nonce = web3.eth.getTransactionCount(address)
while True:
try:
swap()
nonce = nonce + 1
except ValueError as e:
print("swap error {0}".format(e))
time.sleep(split_second)