code: def test_get_standard_colors_default_num_colors(self):
      from pandas.plotting._matplotlib.style import get_standard_colors
  
      # Make sure the default color_types returns the specified amount
      color1 = get_standard_colors(1, color_type="default")
      color2 = get_standard_colors(9, color_type="default")
      color3 = get_standard_colors(20, color_type="default")
      assert len(color1) == 1
      assert len(color2) == 9
      assert len(color3) == 20
  
imports: import os
  import numpy
  import pytest
  import pandas.util._test_decorators
  from pandas import DataFrame, Index, Series, Timestamp, date_range, interval_range, period_range, plotting, read_csv
  import pandas._testing
  from pandas.tests.plotting.common import _check_colors, _check_legend_labels, _check_plot_works, _check_text_labels, _check_ticks_props
label_desc: Use image node_id 23 for calling the TestDataFramePlots obj's underlying member method code with example usage: obj.test_get_standard_colors_default_num_colors() without return types