问题

(venv3) ubuntu@ubuntu-nvidia:~/proj/pythontest$ /home/ubuntu/proj/pythontest/venv3/bin/python /home/ubuntu/proj/pythontest/main.py
/home/ubuntu/proj/pythontest/main.py:39: UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure.
  plt.pause(.001)

UI 没有显示

原因

没有安装python-tk

解决方法

sudo apt install python-tk

或者

pip install tk