问题：

右键点击该函数出现的结果只能是这样的：

解决：

通过修改 settings.json 文件，以解决问题：

这是原来有问题的配置：

{
    "python.autoComplete.extraPaths": [
        "/home/robot/1-temp_make/devel/lib/python2.7/dist-packages",
        "/opt/ros/melodic/lib/python2.7/dist-packages"
    ],
    "python.analysis.extraPaths": [
        "/home/robot/1-temp_make/devel/lib/python2.7/dist-packages",
        "/opt/ros/melodic/lib/python2.7/dist-packages"
    ]
}

主要添加

"C_Cpp.intelliSenseEngine":"default"

就可以解决

最终的配置：

{
    "python.autoComplete.extraPaths": [
        "/home/robot/1-temp_make/devel/lib/python2.7/dist-packages",
        "/opt/ros/melodic/lib/python2.7/dist-packages"
    ],
    "python.analysis.extraPaths": [
        "/home/robot/1-temp_make/devel/lib/python2.7/dist-packages",
        "/opt/ros/melodic/lib/python2.7/dist-packages"
    ],
    "C_Cpp.intelliSenseEngine":"default"
}

"C_Cpp.intelliSenseEngine":"default"的值有三个，我们根据提示选择 default，就可以出现转到定义。