code: def biodf():
      filename = os.path.join(TEST_DATA_DIR, "sequences.tsv")
      df = pd.read_csv(filename, sep="\t").clean_names()
      return df
  
file_path: pyjanitor/tests/conftest.py
imports: import os
  import numpy
  import pandas
  import pytest
  from janitor.testing_utils import date_data
label_desc: Use image node_id 9 for calling a global function with example usage: biodf() and returns: df