code: def _get_openscm_var_from_filepath(filepath):
      
      reader = determine_tool(filepath, "reader")(filepath)
      openscm_var = convert_magicc7_to_openscm_variables(
          convert_magicc6_to_magicc7_variables(reader._get_variable_from_filepath())
      )
  
      return openscm_var
docs: Determine the OpenSCM variable from a filepath.
  
      Uses MAGICC's internal, implicit, filenaming conventions.
  
      Parameters
      ----------
      filepath : str
          Filepath from which to determine the OpenSCM variable.
  
      Returns
      -------
      str
          The OpenSCM variable implied by the filepath.