old_contents: """parses configuration and returns useful things"""
  #pylint: disable=relative-import
  import os
  
  from etl_framework.method_wrappers.check_config_attr import check_config_attr
  
  class ProjectBuildMixin(object):
      """parses configuration files"""
  
      PROJECT_BUILD_ATTR = "project_build"
  
      @check_config_attr
      def get_project_build(self):
          """gets configurations"""
  
          return self.config[self.project_build]
  
      @check_config_attr
      def set_project_build(self, project_build):
          """sets configurations"""
  
          self.config[self.project_build] = project_build
  
  
new_contents: """parses configuration and returns useful things"""
  #pylint: disable=relative-import
  import os
  
  from etl_framework.method_wrappers.check_config_attr import check_config_attr
  
  class ProjectBuildMixin(object):
      """parses configuration files"""
  
      PROJECT_BUILD_ATTR = "project_build"
  
      @check_config_attr
      def get_project_build(self):
          """gets configurations"""
  
          return self.config[self.PROJECT_BUILD_ATTR]
  
      def set_project_build(self, project_build):
          """sets configurations"""
  
          self.config[self.PROJECT_BUILD_ATTR] = project_build
  
  
subject: Add ProjectBuildMixin