我在尝试在ROS中创建catkin工作区时遇到CMake错误，因为它找不到PythonInterp。它找到了一个不合适的版本"1.4"，但它至少需要有 2。但是，我已经为ros下载了更高版本的python。
这就是我跑步时得到的catkin_make
nasa@nasa-VirtualBox:~/catkin_ws$ catkin_make
Base path: /home/nasa/catkin_ws
Source space: /home/nasa/catkin_ws/src
Build space: /home/nasa/catkin_ws/build
Devel space: /home/nasa/catkin_ws/devel
Install space: /home/nasa/catkin_ws/install
####
#### Running command: "make cmake_check_build_system" in "/home/nasa/catkin_ws/build"
####
-- Using CATKIN_DEVEL_PREFIX: /home/nasa/catkin_ws/devel
-- Using CMAKE_PREFIX_PATH: /opt/ros/melodic
-- This workspace overlays: /opt/ros/melodic
CMake Error at /usr/share/cmake-3.10/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
Could NOT find PythonInterp: Found unsuitable version "1.4", but required
is at least "2" (found /home/nasa/catkin_ws/build/python3)
Call Stack (most recent call first):
/usr/share/cmake-3.10/Modules/FindPackageHandleStandardArgs.cmake:376 (_FPHSA_FAILURE_MESSAGE)
/usr/share/cmake-3.10/Modules/FindPythonInterp.cmake:152 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
/opt/ros/melodic/share/catkin/cmake/python.cmake:4 (find_package)
/opt/ros/melodic/share/catkin/cmake/all.cmake:163 (include)
/opt/ros/melodic/share/catkin/cmake/catkinConfig.cmake:20 (include)
CMakeLists.txt:56 (find_package)
-- Configuring incomplete, errors occurred!
See also "/home/nasa/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/nasa/catkin_ws/build/CMakeFiles/CMakeError.log".
Makefile:320: recipe for target 'cmake_check_build_system' failed
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed
使用命令$python -V检查 python 的版本。
如果版本为 2.7，则：
- 转到catkin_ws
- 删除文件夹开发并重新构建
- 在工作区中打开另一个终端，然后重试。
解决方案可能是清理您的工作区。正如这里所暗示的那样，搜索错误后谷歌中的第一个链接，问题是CMakeCache.txt。根据您使用的是catkin build还是catkin_make，您可以在 catkin 工作区中运行catkin clean或catkin_make clean。仅删除工作区中的 devel 和 build 文件夹也应该适用于任一构建系统。
您还可以更快地获得有关 ROS 相关问题的答案 https://answers.ros.org/questions/
如果清理工作区不能解决问题，请检查从终端python --version报告的python版本。此外，如果您安装了新版本的python并从同一终端尝试构建工作区，则相关的ENVIRONMENT路径可能尚未在该shell中更新。运行exec bash或启动新终端并尝试构建工作区。