code: def render_error_debug(request, exception, is_html):
      '''Render the ``exception`` traceback
      '''
      error = Html('div', cn='well well-lg') if is_html else []
      for trace in format_traceback(exception):
          counter = 0
          for line in trace.split('\n'):
              if line.startswith('  '):
                  counter += 1
                  line = line[2:]
              if line:
                  if is_html:
                      line = Html('p', escape(line), cn='text-danger')
                      if counter:
                          line.css({'margin-left': '%spx' % (20*counter)})
                  error.append(line)
      if is_html:
          error = Html('div', Html('h1', request.response.status), error)
      return errof render_error_debug(request, exception, is_html):
      '''Render the ``exception`` traceback
      '''
      error = Html('div', cn='well well-lg') if is_html else []
      for trace in format_traceback(exception):
          counter = 0
          for line in trace.split('\n'):
              if line.startswith('  '):
                  counter += 1
                  line = line[2:]
              if line:
                  if is_html:
                      line = Html('p', escape(line), cn='text-danger')
                      if counter:
                          line.css({'margin-left': '%spx' % (20*counter)})
                  error.append(line)
      if is_html:
          error = Html('div', Html('h1', request.response.status), error)
      return error
docs: Render the ``exception`` traceback