在用matplotlib绘图中：
ax = Axes3D(fig)
我们得到了下面的警告：
MatplotlibDeprecationWarning: Axes3D(fig) adding itself to the figure is deprecated since 3.4. Pass the keyword argument auto_add_to_figure=False and use fig.add_axes(ax) to suppress this warning.
The default value of auto_add_to_figure will change to False in mpl3.5 and True values will no longer work in 3.6. This is consistent with other Axes classes.
解决方法：
按照提示在Axes3D的参数中加上auto_add_to_figure=False：
ax = Axes3D(fig,auto_add_to_figure=False)
fig.add_axes(ax)
错误解决！
