这是基于 asyncio 的 API。连接到一台服务器后获取 key，并立即释放。
broker = TicketBroker.connect("127.0.0.1:5225")
try:
await broker.wait_ready(5)
ticket = await broker.acquire("key", wait=5, lease=30)
await ticket.release()
print("pass")
finally:
broker.close()这是一个验证示例：多个 asyncio 任务通过账户级锁互斥地反复存取款，确认余额最终总能回到初始值。 使用 async with ticket 时，退出该代码块会自动释放。
async def transaction(broker: TicketBroker, account: int, delta: int) -> None:
key = f"account-{account}"
try:
ticket = await broker.acquire(key, WAIT, LEASE)
except Exception as e:
log.error("account %s acquire failed: %s", account, e)
return
async with ticket:
before = BALANCES[account]
await asyncio.sleep(0)
after = before + delta
BALANCES[account] = after
action, sign = ("withdraw", "-") if delta < 0 else ("deposit", "+")
log.info("account %s %s %s$%s -> $%s", account, action, sign, AMOUNT, after)完整示例请参阅 test_example.py、test_bank.py、test_bench.py。