code: def parse_section_packages__find(self, section_options):
          
          section_data = self._parse_section_to_dict(
              section_options, self._parse_list)
  
          valid_keys = ['where', 'include', 'exclude']
  
          find_kwargs = dict(
              [(k, v) for k, v in section_data.items() if k in valid_keys and v])
  
          where = find_kwargs.get('where')
          if where is not None:
              find_kwargs['where'] = where[0]  # cast list to single val
  
          return find_kwargs
docs: Parses `packages.find` configuration file section.
  
          To be used in conjunction with _parse_packages().
  
          :param dict section_options: