在cmake中常见以下错误：

  By not providing "FindPython3.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "Python3", but
  CMake did not find one.

  Could not find a package configuration file provided by "Python3" with any
  of the following names:

    Python3Config.cmake
    python3-config.cmake

在确保find_package指令没写错的情况下（find_package(Python3 COMPONENTS Interpreter Development REQUIRED)，检查一下cmake版本，cmake版本要在3.12以上才支持。

如果不懂如何更新cmake，可以参考这个：
cmake更新方法