运行rqt
错误:ModuleNotFoundError: No module named 'catkin_pkg'

pip3 install catkin_pkg
会显示already installed, 在一个python的路径下,/library/frameworks/.../site-packages

vi ~/.zshrc
加入export PYTHONPATH=$PYTHONPATH:/library/frameworks/.../site-packages
source ~/.zshrc

运行rqt, 跳出窗体来。