假设你应该在一个类中使用它并且将下面的 txt 引用为 self.txt 我为方便起见，请在此处使用 global:

Assuming you should use it in a class and refer to the following txt as self.txt I use global here for sake of ease:

txt = None

def onclick(event):
    global txt
    txt = plt.text(event.xdata, event.ydata, 'TESTTEST', fontsize=8)
    fig.canvas.draw()

def offclick(event):
    txt.remove()
    fig.canvas.draw()

fig.canvas.mpl_connect('button_press_event', onclick)
fig.canvas.mpl_connect('button_release_event', offclick) 

plt.show()