code: def to_svg(self, converter=None):
          
          if converter is None:
              from knittingpattern.convert.InstructionSVGCache import \
                  default_svg_cache
              converter = default_svg_cache()
          return converter.to_svg(self)
docs: Return a SVGDumper for this instruction.
  
          :param converter: a :class:`
            knittingpattern.convert.InstructionSVGCache.InstructionSVGCache` or
            :obj:`None`. If :obj:`None` is given, the :func:`
            knittingpattern.convert.InstructionSVGCache.default_svg_cache` is
            used.
          :rtype: knittingpattern.Dumper.SVGDumper