code: def prefix_all(self, prefix='#', *lines):
          
          for line in lines:
              if isinstance(line, (tuple, list)):
                  self.prefix(prefix, *line)
              elif line:
                  self.prefix(prefix, line)
              else:
                  self.blank()
docs: Same as :func:`~prefix`, for multiple lines.
  
          :param prefix: Dockerfile command to use, e.g. ``ENV`` or ``RUN``.
          :type prefix: unicode | str
          :param lines: Lines with arguments to be prefixed.
          :type lines: collections.Iterable[unicode | str]