What does "URGENT" mean? Do you want us to answer your question ahead of others that are already in the queue? That's not nice.
Have a look at this Python - Arduino demo
It may need a little modification if you are using Python 3 as it was written with 2.7
PS ... the OP sent me a PM complaining about my use of the word "queue". I'm quite sure he knew that I know there is no actual queue like at a supermarket checkout. It was his use of the word "URGENT" to get preferential treatment that I was complaining about.
EDIT to try to make some sense of a very confusing situation. It appears that somebody else who has (at the moment) made no Posts sent me the PM complaining about the word "queue" and I (reasonably, I think) jumped to the conclusion that the PM had come from the OP.
I apologise to @LiTing for this confusion.