code: def df():
      try:
          df = pd.read_csv(
              "tests/data/test_data.csv", index_col=0, parse_dates=True
          )
      except FileNotFoundError as e:
          try:
              df = pd.read_csv(
                  "data/test_data.csv", index_col=0, parse_dates=True
              )
          except FileNotFoundError as e2:
              raise (str(e2))
      return df
  
imports: import ffn
  import pandas
  import numpy
  from pytest import fixture
  from numpy.testing import assert_almost_equal
label_desc: Use image node_id 1 for calling a global function with example usage: df() and returns: df