[英]Python trap routine
Alright so for a living I program ABB industrial robots , and the programming language we use is called Rapid . 好的,这样我就可以为ABB工业机器人编程,而我们使用的编程语言称为Rapid 。
One really cool thing I can do in Rapid is called a trap routine. 我在Rapid中可以做的一件非常酷的事情称为陷阱例程。 And it's like a while loop but instead of looping through the whole loop before it checks a condition it will break literally as soon as the event its waiting for happens. 这就像一个while循环,而不是在检查条件之前遍历整个循环,它会在等待事件发生时立即中断。
I suppose it is similar to an event listener in javascript. 我想它类似于javascript中的事件监听器。 It's like it runs in the background of the normal program. 就像它在普通程序的后台运行一样。 I want to do this in python. 我想在python中做到这一点。
I have little formal CS education so I'm not exactly sure what this concept is. 我几乎没有进行过CS的正规教育,所以我不确定这个概念是什么。 Sorry if it's a bit vague I'm not really sure how to ask it in a clear way. 抱歉,如果有点含糊,我不确定如何以明确的方式提出。
Like most languages, so does Python handle system signals by using handler functions. 像大多数语言一样,Python也通过使用处理函数来处理系统信号 。 For more details, take a look at the Signals chapter which talks about receiving and sending signals, with examples eg here . 有关更多详细信息,请参阅“ 信号”一章 ,其中讨论了接收和发送信号,例如此处 。
In short, you can bind a function to one or more signals: 简而言之,您可以将函数绑定到一个或多个信号:
>>> import signal
>>> import sys
>>> import time
>>>
>>> # Here we define a function that we want to get called.
>>> def received_ctrl_c(signum, stack):
... print("Received Ctrl-C")
... sys.exit(0)
...
>>> # Bind the function to the standard system Ctrl-C signal.
>>> handler = signal.signal(signal.SIGINT, received_ctrl_c)
>>> handler
<built-in function default_int_handler>
>>>
>>> # Now let’s loop forever, and break out only by pressing Ctrl-C, i.e. sending the SIGINT signal to the Python process.
>>> while True:
... print("Waiting…")
... time.sleep(5)
...
Waiting…
Waiting…
Waiting…
^CReceived Ctrl-C
In your specific case, find out which signal(s) the robot sends to your Python process (or whichever process listens to signals) and then act on them as shown above. 在您的特定情况下,找出机器人发送到您的Python进程(或哪个进程侦听信号)的信号,然后对它们进行操作,如上所示。
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