def pressed(channel):
    press = 1
    times = time.time()
    io.add_event_detect(pin, io.RISING, callback = released, bouncetime = 200)
    if time.time() - times = 3:
            print "You have held the button for 3 seconds"
    elif time.time() - times = 5
            print "You have held the button for 5 seconds"
    elif time.time() - timed = 6:
            print "You can let go now"

File "shutdown.py", line 43
    while press == 1:
        ^
SyntaxError: invalid syntax