from matplotlib import pyplot as plt

plt.rcParams['backend'] = 'TkAgg'
plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True

# 打印鼠标单击事件的坐标
def onclick(event):
   print([event.xdata, event.ydata])

# 创建一个图形和子图集
fig, ax = plt.subplots()

# 在10的范围内绘制一条线
ax.plot(range(10))

# 将button_press_event与onclick()方法绑定
fig.canvas.mpl_connect('button_press_event', onclick)

# 显示图形
plt.show()

[6.277811659536052 6.218189947945731]
[4.9416949672083685 3.7079096112932475]
[8.221254287227506 3.4145010811941963]