def render(self, ctx=None):
        '''
        Only render if condition applies

        :param ctx: rendering context in which the method was called
        :rtype: `Bits`
        :return: rendered value of the container
        '''
        if ctx is None:
            ctx = RenderContext()
        self._initialize()
        if self in ctx:
            self._current_rendered = self._in_render_value()
        else:
            ctx.push(self)
            if self._evaluate_condition(ctx):
                super(Conditional, self).render(ctx)
            else:
                self.set_current_value(empty_bits)
            ctx.pop()
        return self._current_rendered
def render ( self , ctx = None ) : if ctx is None : ctx = RenderContext ( ) self . _initialize ( ) if self in ctx : self . _current_rendered = self . _in_render_value ( ) else : ctx . push ( self ) if self . _evaluate_condition ( ctx ) : super ( Conditional , self ) . render ( ctx ) else : self . set_current_value ( empty_bits ) ctx . pop ( ) return self . _current_rendered
Only render if condition applies

        :param ctx: rendering context in which the method was called
        :rtype: `Bits`
        :return: rendered value of the container