import winsound
import threading
import time

def play0():
    winsound.PlaySound('SystemExclamation', winsound.SND_ALIAS)

def play1():
    winsound.PlaySound('SystemHand', winsound.SND_ALIAS | winsound.SND_NOWAIT)

thread = threading.Thread(target=play0)
thread.start()

# Just to provide more certainty that the thread is actually already
# playing the sound when we call play1() below.
time.sleep(0.1)

# This plays a sound _after_ the thread is finished playing the sound,
# due to the fact that WinAPI's PlaySound() queues the play requests.
play1()

# From the MSDN docs on SND_NOWAIT, it's not clear what a "busy
# driver" means. For example, can every process, or even every thread,
# have a different state of the driver? That is, can the driver appear
# busy in one process, and idle in another?
#
# Anyway, before we called play1(), the driver should be busy, because
# of the thread that calls play0(). Thus, if the winsound.SND_NOWAIT
# flag indeed makes winsound.PlaySound() return immediately because of
# the busy driver, then the sound specified in play1() should not play
# (but it in fact does, at least on modern Windows platforms).
#
# Hence, the Python documentation should be updated to state that the
# winsound.SND_NOWAIT flag is not supported on modern Windows
# platforms, just as the documentation states this for
# winsound.SND_PURGE.