code: def render(self, ctx=None):
          '''
          Render the current value into a :class:`bitstring.Bits` object
  
          :rtype: :class:`bitstring.Bits`
          :return: the rendered field
          '''
          self._initialize()
          if ctx is None:
              ctx = RenderContext()
          #
          # if we are called from within render, return a dummy object...
          #
          if self in ctx:
              self._current_rendered = self._in_render_value()
          else:
              ctx.push(self)
              if self.dependency_type == Calculated.VALUE_BASED:
                  self._rendered_field = self._field.render(ctx)
              self._render()
              ctx.pop()
          return self._current_renderef render(self, ctx=None):
          '''
          Render the current value into a :class:`bitstring.Bits` object
  
          :rtype: :class:`bitstring.Bits`
          :return: the rendered field
          '''
          self._initialize()
          if ctx is None:
              ctx = RenderContext()
          #
          # if we are called from within render, return a dummy object...
          #
          if self in ctx:
              self._current_rendered = self._in_render_value()
          else:
              ctx.push(self)
              if self.dependency_type == Calculated.VALUE_BASED:
                  self._rendered_field = self._field.render(ctx)
              self._render()
              ctx.pop()
          return self._current_rendered
docs: Render the current value into a :class:`bitstring.Bits` object
  
          :rtype: :class:`bitstring.Bits`
          :return: the rendered field