Matplotlib 3.0 Cookbook

How to do it...

Here is the code for plotting the sin and cos functions with a legend and title, and capturing keyboard events and associated callback functions to respond to the keyboard events:

1. Define a callback function that responds to key_press_event:

def press(event):    global prst    prst = time()    print('press', event.key)

2. Define a callback function that responds to key_release_event:

def release(event):    relt = time()    ht = relt - prst    print('hold time:',round(ht,2))    if event.key == 'x':        visible = lg.get_visible()        lg.set_visible(not visible)        tm = 'hold time: ' + str(round(ht, 2))        t = plt.text(np.random.randint(1,4),                      np.random.randint(-3,4), tm)        plt.setp(t, color='r', size=15, weight='bold')        ax.add_artist(t)        fig.canvas.draw()

3. Prepare ...