importrandomimporttimefromcollections.abcimportIterablefromthreadingimportThreadimportmatplotlibimportmatplotlib.animationasanimationimportmatplotlib.artistimportmatplotlib.pyplotaspltmatplotlib.use("QtAgg")# NOTE: need interactive backend to show plotfig,ax=plt.subplots()ax.set_xlim(0,1)ax.set_ylim(0,1)lines:list[matplotlib.artist.Artist]= []defadd_line(num_points:int=10,sleep_time:float=0.2)->None:x_data,y_data= [], []    (line,)=ax.plot(x_data,y_data)lines.append(line)defadd_random_datapoint()->None:x_data.append(random.random())y_data.append(random.random())line.set_data(x_data,y_data)# NOTE: I am letting FuncAnimation handle drawing and flushing eventsfor_inrange(num_points):add_random_datapoint()time.sleep(sleep_time)defanimate(frame:int,*fargs)->Iterable[matplotlib.artist.Artist]:yieldfromlinesani=animation.FuncAnimation(fig,animate,interval=100)plt.pause(0.1)# Begin seeding datathread=Thread(target=add_line,daemon=False)thread.start()# plt.show(block=True)  # Works fineplt.show(block=False)# Doesn't workthread.join()_=0