Matplotlib – python – click on a point and drag it around

# draw one point using subplot
# click on the point and drag it around

import matplotlib.pyplot as plt

press = False

def onPress(event):
    global press
    contains, _ = pnt.contains(event)
    # make sure the click is on the object
    if contains:
        press = True

def onMove(event):
    global press
    if press == True:
        # only for events inside the axes
        if event.inaxes == pnt.axes:
            print(event.xdata, event.ydata)
            pnt.set_data([event.xdata, event.ydata])

def onRelease(event):
    global press
    press = False

fig, ax = plt.subplots()
pnt, = ax.plot([0],[1], 'ro')
pnt.figure.canvas.mpl_connect('button_press_event', onPress)
pnt.figure.canvas.mpl_connect('motion_notify_event', onMove)
pnt.figure.canvas.mpl_connect('button_release_event', onRelease)

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