old_contents: 
  class Dataset(object):
    
    def __init__(dataPoints):
      self.dataPoints = dataPoints
      
    def classify(point, k):
      
  
new_contents: 
  class Classifier(object):
    
    def __init__(dataPoints):
      self.dataPoints = dataPoints
      
    def classify(point, k):
      
  
subject: Update core.py