import time

TIME = 10


def i_will_run_if_takes_more_time(signum, frame):
    raise Exception("Time has passed. For now i am just printing!")


# This function *may* run for an indetermined time...
def i_am_the_main_function():
    while 1:
        print("main funbction is running...")
        time.sleep(1)


# Register the signal function handler
signal.signal(signal.SIGALRM, i_will_run_if_takes_more_time)


# Define a timeout for your function
signal.alarm(TIME)


try:
      i_am_the_main_function()
except Exception as e:
      print(e)