币币交易所，是一种用数字货币直接交易数字货币的交易模式，也是国内首个“杠杆+数字货币”的交易平台。用户可以直接使用具有数字货币功能的钱包，通过充值的方式获得交易账户，直接使用数字货币进行交易。币币交易所通常只提供数字货币之间的交易，不提供人民币与数字货币的交易。用户需要先将人民币兑换为数字货币，才能进行交易。

以下是一个简单的币币交易所合约源码示例，仅供参考：

导入必要的库

from web3 import Web3
from web3.contract importabi_to_bin

合约ABI定义

ABI = '''
[{"constant": false, "inputs": [], "name": "deposit", "outputs": [], "payable": true, "stateMutability": "payable", "type": "function"},
{"constant": false, "inputs": [{"name": "amount", "type": "uint256"}, {"name": "recipient", "type": "address"}], "name": "withdraw", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function"},
{"constant": true, "inputs": [], "name": "getDeposit", "outputs": [{"name": "", "type": "uint256"}], "payable": false, "stateMutability": "view", "type": "function"}, 【完整逻辑部署搭建可看我昵称】
{"constant": true, "inputs": [], "name": "getTotalSupply", "outputs": [{"name": "", "type": "uint256"}], "payable": false, "stateMutability": "view", "type": "function"}]
'''

合约地址 【完整逻辑部署搭建可看我昵称】

CONTRACT_ADDRESS = '0x1234...' # 这里填写你的合约地址

连接到以太坊节点

web3 = Web3(Web3.HTTPProvider('https://rinkeby.infura.io/'))

获取合约对象

contract = web3.eth.contract(address=web3.toChecksumAddress(CONTRACT_ADDRESS), abi=ABI)

存款函数

def deposit():
contract.transact().deposit()
print('Deposit successful')
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提币函数

def withdraw(amount, recipient):
transaction = {
'to': Web3.toChecksumAddress(recipient),
'value': Web3.toWei(amount, 'ether'),
'gas': 2000000,
'gasPrice': web3.toWei('1', 'gwei')
}
signed_txn = contract.transact(transaction)
tx_hash = signed_txn.hash
print('Withdrawal transaction hash:', tx_hash)

查询存款函数

def get_deposit():
return contract.call().getDeposit()

查询总供应量函数

def get_total_supply():
return contract.call().getTotalSupply()

示例使用方法

deposit() # 存款
withdraw(10, '0x2345...') # 提币到指定地址
print(get_deposit()) # 查询存款金额
print(get_total_supply()) # 查询总供应量