ERROR: cannot launch node of type [mbot_teleop/mbot_teleop.py]: can't locate node [mbot_teleop.py] in package [mbot_teleop]
解決：
mbot_teleop.py不是可執行文件，需要把mbot_teleop.py改成可執行文件
１．locate mbot_teleop.py 找到文件位置
２．在py文件上右鍵->屬性->權限的Execute:Allow executing file as program上打鉤