今天在做串口通信（下位机为plc）的时候发现同一份源码，timeout 一个设置为1，一个设置为0.01，但返回UI的速度完全不一样，前者慢的要死

我擦，这个竟然对通信有影响，赶紧查看官方文档：

• timeout = None: wait forever / until requested number of bytes are received
• timeout = 0: non-blocking mode, return immediately in any case, returning zero or more, up to the requested number of bytes
• timeout = x: set timeout to x seconds (float allowed) returns immediately when the requested number of bytes are available, otherwise wait until the timeout expires and return all bytes that were received until then.