How to plot an ADC value from the Raspberry PI Pico using pythons matplotlib

Question

Being new to Python and this community, I am trying to plot the pulse return from a transducer. The pulse return is 400 uSecs in duration and occurs every 100 milliseconds. So far I can plot the received values that are constantly being received and the plot graphs these in a strip chart fashion scrolling from right to left. I would like to be able to present the plot similar to how an oscilloscope would display the return pulse. I am not all that familiar with Numpy arrays yet. I am not sure what I am forgetting in writing the proper syntax for this. Here is a snippet of the code I am having issues with.

### Parameters   ##################
x = 300            # Number of points to display

y_range = [0,300]   # Range of possible Y values to display
#y_range = list(np.arange(0, 300))
xs = list(np.arange(0, 300))
ys = [0] * x
plot1.set_ylim(y_range)

###  Initialize communication with the pico and read value from ADC
reading = analogio.AnalogIn(board.ADC0)

###   Create plot line
line, = plot1.plot(xs, ys, color= "yellow")

###   Start Thread
def plot():
    def animate(i, ys):
    # Read data from Pico
        DATA = reading.value/20
    
    #   Add y to list
        ys.append(DATA)
    
    #   Limit y list to set number of items
        ys = ys[- x:]
        #ys = ys(np.arange(0, 300))
    
    #   Update line with new y values
        line.set_ydata(ys)
        print("ADC:", DATA) 
        return line,

### Set up plot to call animate() function
    ani = animation.FuncAnimation(fig, animate, fargs=(ys,),interval=.0001, blit=True)
    
    

print("thread starting")
t = threading.Thread(name='plot', target=plot)
t.setDaemon(True)
t.start()