Could not find a package configuration file provided by “rospy“ with any of the following names:报错

我在跟着ROS Tutorials学习初级教程的第三步创建ROS软件包的过程中，遇到了catkin_make命令一直报错：

从具体的报错信息来看，它给出的原因是缺少rospy软件包：

CMake Error at /opt/ros/noetic/share/catkin/cmake/catkinConfig.cmake:83 (find_package):
  Could not find a package configuration file provided by "rospy" with any of
  the following names:

    rospyConfig.cmake
    rospy-config.cmake

  Add the installation prefix of "rospy" to CMAKE_PREFIX_PATH or set
  "rospy_DIR" to a directory containing one of the above files.  If "rospy"
  provides a separate development package or SDK, be sure it has been
  installed.

解决办法（将noetic换成对应的ROS版本）：

sudo apt-get install ros-noetic-rospy

再运行catkin_make就没有报错了。

        如果这种办法是一次性的，下次还会报错的话，我的解决办法是重新安装完整桌面版ROS，它会补全所缺失的文件（不会像第一次下载ROS那样慢，因为它只会下载缺失的文件）：

sudo apt install ros-noetic-desktop-full