Matplolib发出“无此类通信”警告并杀死内核

Question

运行下面的代码会引发以下警告并重新启动内核。我不知道到底是什么问题。我只是使用conda update spyder更新了spyder，它更新了一些包，但我不记得是哪些包，这是一个问题。这也发生在Jupyter笔记本中。
代码：

import matplotlib.pyplot as plt
plt.plot([1,2,3], [3,2,1])

输出：

Kernel died, restarting


 
Restarting kernel... 


 
[SpyderKernelApp] WARNING | No such comm: 06a1ec70bcf811eb9e02e02be9f62425
[SpyderKernelApp] WARNING | No such comm: b8449f0dbcfe11eb8d89e02be9f62425
[SpyderKernelApp] WARNING | No such comm: c693f30dbcfe11eb9615e02be9f62425
[SpyderKernelApp] WARNING | No such comm: 86aca564bd0311ebbad2e02be9f62425
[SpyderKernelApp] WARNING | No such comm: ac401d76bd0311eba789e02be9f62425
[SpyderKernelApp] WARNING | No such comm: eaeb5ae6bd0411eb9174e02be9f62425
[SpyderKernelApp] WARNING | No such comm: 547f6998bd0511eb9647e02be9f62425
[SpyderKernelApp] WARNING | No such comm: edd1e086bd0711eb9117e02be9f62425
[SpyderKernelApp] WARNING | No such comm: 3ab7fde3bd0811eba5f1e02be9f62425