code: def test_column_append(self):
      g = self.upload_and_return_grid()
      new_col = Column([1, 5, 3], "new col")
      py.grid_ops.append_columns([new_col], grid=g)
  
imports: from __future__ import absolute_import
  import random
  import string
  from unittest import skip
  from chart_studio import plotly
  from chart_studio.exceptions import InputError, PlotlyRequestError
  from _plotly_utils.exceptions import PlotlyError
  from plotly.graph_objs import Scatter
  from chart_studio.grid_objs import Column, Grid
  from chart_studio.plotly import parse_grid_id_args
  from chart_studio.tests.utils import PlotlyTestCase
label_desc: Use image node_id 7 for calling the GridTest obj's underlying member method code with example usage: obj.test_column_append() without return types