code: def test_errorbars_line_width_op_update(self):
      errorbars = HoloMap(
          {
              0: ErrorBars(
                  [
                      (0, 0, 0.1, 0.2, 1),
                      (0, 1, 0.2, 0.4, 4),
                      (0, 2, 0.6, 1.2, 8),
                  ],
                  vdims=["y", "perr", "nerr", "line_width"],
              ),
              1: ErrorBars(
                  [
                      (0, 0, 0.1, 0.2, 2),
                      (0, 1, 0.2, 0.4, 6),
                      (0, 2, 0.6, 1.2, 4),
                  ],
                  vdims=["y", "perr", "nerr", "line_width"],
              ),
          }
      ).opts(linewidth="line_width")
      plot = mpl_renderer.get_plot(errorbars)
      artist = plot.handles["artist"]
      self.assertEqual(artist.get_linewidths(), [1, 4, 8])
      plot.update((1,))
      self.assertEqual(artist.get_linewidths(), [2, 6, 4])
  
file_path: holoviews/holoviews/tests/plotting/matplotlib/test_errorbarplot.py
imports: import numpy
  import pytest
  from holoviews.core.options import AbbreviatedException
  from holoviews.core.spaces import HoloMap
  from holoviews.element import ErrorBars
  from .test_plot import TestMPLPlot, mpl_renderer
label_desc: Use image node_id 8 for calling the TestErrorBarPlot obj's underlying member method code with example usage: obj.test_errorbars_line_width_op_update() without return types