复现调用时碰到的各种常见问题

一、python2,3下cv_bridge问题

mkdir -p cv_bridge_ws/src 
cd cv_bridge_ws
catkin init
catkin config -DPYTHON_EXECUTABLE=/usr/bin/python3 -DPYTHON_INCLUDE_DIR=/usr/include/python3.6m -DPYTHON_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython3.6m.so
catkin config --install
git clone https://github.com/ros-perception/vision_opencv.git src/vision_opencv
apt-cache show ros-melodic-cv-bridge |<