Having difficulty with threads and input()

[Gribouillis]

Disclaimer: does not work for what you want to do.
You can perhaps try this code where I interrupt the main thread which reads stdin by closing stdin in another thread. It works for me in Linux

import sys
import threading
from time import sleep

def work():
    sleep(3)
    sys.stdin.close()
    print("End of worker's task!")

def main():
    worker = threading.Thread(target=work)
    worker.start()
    try:
        for line in sys.stdin:
            print(line, end='')
    except ValueError as err:
        print(repr(err))
    finally:
        worker.join()

if __name__ == '__main__':
    main()

Output:
λ python paillasse/pf/inputthread.py
spam 
spam
eggs
eggs
End of worker's task!
ValueError('I/O operation on closed file.')

EDIT: Unfortunately it does not work! the error is not thrown unless stdin tries to read a line after it was closed! You could as well check in the loop if an event is set.