contorno 3D Matplotlib

# Filename: example.py
# Copyright: 2020 By w3codebox
# Author by: it.oldtoolbag.com
# Date: 2020-08-08
#!/usr/bin/env python
　#coding=utf-8
　import matplotlib.pyplot as plt
　import numpy as np
　import math
　import seaborn as sns
　plt.rcParams['font.sans-serif'] = ['SimHei']  # 步骤一(替换sans-serif字体)
　plt.rcParams['axes.unicode_minus'] = False  # 原文出自【立地货】，商业转载请联系作者获得授权，非商业请保留原文链接：
　from mpl_toolkits import mplot3d
　def f(x, y):
　　　　return np.sin(np.sqrt(x ** 2 + y ** 2))
　x = np.linspace(-6, 6, 30)
　y = np.linspace(-6, 6, 30)
　X, Y = np.meshgrid(x, y)
　Z = f(X, Y)
　fig = plt.figure()
　ax = plt.axes(projection='3d')
　ax.contour3D(X, Y, Z, 50, cmap='binary')
　ax.set_xlabel('x')
　ax.set_ylabel('y')
　ax.set_zlabel('z')
　ax.set_title('3D　contour')
　plt.show()