code: def df():
      return pd.DataFrame(
          [
              {
                  "rank": 1,
                  "pet_type": np.nan,
                  "breed": "Boston Terrier",
                  "owner": "sam",
              },
              {
                  "rank": 2,
                  "pet_type": np.nan,
                  "breed": "Retrievers (Labrador)",
                  "owner": "ogor",
              },
              {
                  "rank": 3,
                  "pet_type": np.nan,
                  "breed": "Retrievers (Golden)",
                  "owner": "nathan",
              },
              {
                  "rank": 4,
                  "pet_type": np.nan,
                  "breed": "French Bulldogs",
                  "owner": np.nan,
              },
              {
                  "rank": 5,
                  "pet_type": np.nan,
                  "breed": "Bulldogs",
                  "owner": np.nan,
              },
              {
                  "rank": 6,
                  "pet_type": "Dog",
                  "breed": "Beagles",
                  "owner": np.nan,
              },
              {
                  "rank": 1,
                  "pet_type": np.nan,
                  "breed": "Persian",
                  "owner": np.nan,
              },
              {
                  "rank": 2,
                  "pet_type": np.nan,
                  "breed": "Maine Coon",
                  "owner": "ragnar",
              },
              {
                  "rank": 3,
                  "pet_type": np.nan,
                  "breed": "Ragdoll",
                  "owner": np.nan,
              },
              {
                  "rank": 4,
                  "pet_type": np.nan,
                  "breed": "Exotic",
                  "owner": np.nan,
              },
              {
                  "rank": 5,
                  "pet_type": np.nan,
                  "breed": "Siamese",
                  "owner": np.nan,
              },
              {
                  "rank": 6,
                  "pet_type": "Cat",
                  "breed": "American Short",
                  "owner": "adaora",
              },
          ]
      )
  
file_path: pyjanitor/tests/functions/test_fill_direction.py
imports: import numpy
  import pandas
  import pytest
  from pandas.testing import assert_frame_equal
  import janitor
label_desc: Use image node_id 1 for calling a global function with example usage: df() and returns: pd