old_contents: '''
  This module provides Fisher's Iris flower data set. It exposes a an attribute 'flowers' which is
  a pandas dataframe with the following fields:
  
      flowers['petal_length']
      flowers['petal_width']
      flowers['sepal_length']
      flowers['sepal_width']
      flowers['species']
  
  '''
  from os.path import dirname, join
  
  try:
      import pandas as pd
  except ImportError as e:
      raise RuntimeError("Iris data requires pandas (http://pandas.pydata.org) to be installed")
  
  flowers = pd.read_csv(join(dirname(__file__), 'iris.csv'))
new_contents: '''
  This module provides Fisher's Iris flower data set. It exposes a an attribute 'flowers' which is
  a pandas dataframe with the following fields:
  
      flowers['petal_length']
      flowers['petal_width']
      flowers['sepal_length']
      flowers['sepal_width']
      flowers['species']
  
  '''
  from os.path import dirname, join
  
  try:
      import pandas as pd
  except ImportError as e:
      raise RuntimeError("iris data requires pandas (http://pandas.pydata.org) to be installed")
  
  flowers = pd.read_csv(join(dirname(__file__), 'iris.csv'))
subject: update error text