解决ros环境运行Python文件出现ImportError: No module named yaml的问题
File“/home/nvidia/Documents/roshell/hello_rospy/src/beginner_tutorials/scripts/talker.py”,line39,inimportrospyFile“/opt/ros/noetic/lib/python3/dist-packages/rospy/init.py”,line47,infromstd_msgs.msgimp