小编nee*_*elp的帖子

我正在尝试在调用button_press_event时在鼠标指针位置向图形添加文本,并在调用button_release_event时将其删除.我已经成功添加了文本,但我无法将其删除.这是我使用的代码的一部分:

def onclick(event):
    print 'you pressed', event.button, event.xdata, event.ydata
    plt.text(event.xdata, event.ydata, 'TESTTEST', fontsize=8)
    fig.canvas.draw()

def offclick(event):
    print 'you released', event.button, event.xdata, event.ydata
    #not sure what to put here
    #I tried:
    #plt.text(event.xdata, event.ydata, '')
    fig.canvas.draw()

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

plt.show()