https://blog.csdn.net/sinat_23133783/article/details/109527366
ax.spines[‘top‘].set_visible(False)
ax.spines[‘right‘].set_visible(False)
ax.spines[‘bottom‘].set_visible(False)
ax.spines[‘left‘].set_visible(False)
原文：https://www.cnblogs.com/hany-postq473111315/p/15202828.html