code: def build_composite(
          self, format_string, param_dict=None, composites=None, attr_getter=None
      ):
          
  
          if param_dict is None:
              param_dict = {}
  
          # merge any composites into the param_dict.
          # as they are no longer dealt with separately
          if composites:
              for key, value in composites.items():
                  param_dict[key] = Composite(value)
  
          try:
              return self._formatter.format(
                  format_string,
                  self._py3status_module,
                  param_dict,
                  force_composite=True,
                  attr_getter=attr_getter,
              )
          except Exception:
              self._report_exception(u"Invalid format `{}`".format(format_string))
              return [{"full_text": "invalid format"}]
docs: .. note::
              deprecated in 3.3 use safe_format().
  
          Build a composite output using a format string.
  
          Takes a format_string and treats it the same way as ``safe_format()`` but
          also takes a composites dict where each key/value is the name of the
          placeholder and either an output eg ``{'full_text': 'something'}`` or a
          list of outputs.