code: def taxonomy_df():
      """pytest fixture"""
      return pd.DataFrame(
          {
              "Year": [1999, 2000, 2004, 1999, 2004],
              "Taxon": [
                  "Saccharina",
                  "Saccharina",
                  "Saccharina",
                  "Agarum",
                  "Agarum",
              ],
              "Abundance": [4, 5, 2, 1, 8],
          }
      )
  
imports: from string import ascii_lowercase
  import numpy
  import pandas
  import pytest
  from hypothesis import given, settings
  from pandas.testing import assert_frame_equal
  from janitor.testing_utils.strategies import categoricaldf_strategy
label_desc: Use image node_id 4 for calling a global function with example usage: taxonomy_df() and returns: pd