python
    
    
def main():
    while not exchange.IO("status"):
        Sleep(1000)

    Log(exchange.SetContractType("rb888"))
    Log(exchange.GetContractType())

    rust
    
    
fn main() {
    // 鉴于此为测试代码，未采用商品期货策略的通用架构，这里仅通过 exchange.IO("status") 函数判断，在确认成功连接期货公司前置机后立即执行测试代码。股票证券交易无需使用 exchange.IO("status") 判断连接状态
    while !exchange.IO("status").is_ok_and(|v| v.as_i64() == Some(1)) {
        Sleep(1000);
    }

    Log!(exchange.SetContractType("rb888"));
    Log!(exchange.GetContractType());
}