python绘制散点图并标记序号

实现二维平面上散点的绘制，并可以给每个散点标记序号或者名称：

import numpy as np

import matplotlib.pyplot as plt

x=[2.3,4.5,3,7,6.5,4,5.3]

y=[5,4,7,5,5.3,5.5,6.2]

n=np.arange(7)

fig,ax=plt.subplots()

ax.scatter(x,y,c='r')

for i,txt in enumerate(n):

    ax.annotate(txt,(x[i],y[i]))