import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D 

plt.rcParams['font.sans-serif']=['SimHei']  


iris = np.loadtxt(r"\iris.csv", delimiter=",", usecols=(0,1,2))


Setosa = iris[:50]

Versicolor = iris[50:100]


Virginica = iris[100:]


fig = plt.figure()

ax = fig.add_subplot(111, projection='3d')


ax.scatter(Setosa[:,0], Setosa[:,1], Setosa[:,2], c='r', label='Setosa')
ax.scatter(Versicolor[:,0], Versicolor[:,1], Versicolor[:,2], c='g', label='Versicolor')
ax.scatter(Virginica[:,0], Virginica[:,1], Virginica[:,2], c='b', label='Virginica')


ax.legend()


ax.set_xlabel('花萼长度')
ax.set_ylabel('花萼宽度')
ax.set_zlabel('花瓣长度')


ax.set_title('鸢尾花三维散点图')


plt.show()