code: def random_filename(self):
      random_chars = [
          random.choice(string.ascii_uppercase) for _ in range(5)
      ]
      unique_filename = "Valid Grid with Meta " + "".join(random_chars)
      return unique_filename
  
file_path: plotly.py/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_meta/test_meta.py
imports: from __future__ import absolute_import
  import random
  import string
  from unittest import skip
  from chart_studio import plotly
  from chart_studio.exceptions import PlotlyRequestError
  from chart_studio.grid_objs import Column, Grid
  from chart_studio.tests.utils import PlotlyTestCase
label_desc: Use image node_id 2 for calling the MetaTest obj's underlying member method code with example usage: obj.random_filename() and returns: unique_filename