How to capture the output of backend thread in jupyter_client

[Jeff Zhang]

I use jupyter_client to execute a piece of code and get its output.  It works for most of the cases, but doens't work when my code has a backend thread.  e.g. the following code start a thread, but I could not get the output via jupyter_client. Does anyone know how can I get the output of this case ? Thanks

import time
from threading import Thread


def worker():
    for i in range(3):
        time.sleep(1)
        print(i)
       
t = Thread(target=worker)
t.start()