code: def section(self, section):
          
          if not isinstance(self._container, ConfigUpdater):
              raise ValueError("Sections can only be added at section level!")
          if isinstance(section, str):
              # create a new section
              section = Section(section, container=self._container)
          elif not isinstance(section, Section):
              raise ValueError("Parameter must be a string or Section type!")
          if section.name in [block.name for block in self._container
                              if isinstance(block, Section)]:
              raise DuplicateSectionError(section.name)
          self._container.structure.insert(self._idx, section)
          self._idx += 1
          return self
docs: Creates a section block
  
          Args:
              section (str or :class:`Section`): name of section or object
  
          Returns:
              self for chaining