代码：
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
import matplotlib.animation as animation
if __name__ == '__main__':
#调试部分
print("program running")
x1=[1,2,3]
y1=[3,4,5]
z1=[6,7,8]
fig = plt.figure()
ax = Axes3D(fig,auto_add_to_figure=False)
fig.add_axes(ax)
ax.legend(loc='best')
ax.axis('off')
def demo(num):
print("running")
a=tmin_+((tmax_-tmin_)/tnums)*(num%tnums)
print(a,(tmax_-tmin_)/tnums,num)
ax.scatter(x1[:num],y1[:num],z1[:num], c = 'r')
print(1)
ani = animation.FuncAnimation(fig, demo,fargs=[],
interval=0)
fig.show()
print("end...")
结果未显示图像（一闪而过）
运行结果：（console里的内容）
1
end...
No handles with labels found to put in legend.
C:\Users\*****\AppData\Roaming\Python\Python39\site-packages\matplotlib\animation.py:973: UserWarning: Animation was deleted without rendering anything. This is most likely unintended. To prevent deletion, assign the Animation to a variable that exists for as long as you need the Animation.
warnings.warn(
Animation的哪里出了问题？（急用求解决）
