old_contents: 
  class Classifier(object):
    
    def __init__(dataPoints):
      self.dataPoints = dataPoints
      
    def classify(point, k):
      
  
new_contents: import math
  
  def euclideanDistance(point, point2, length):
    distance = 0
    for i in xrange(length):
      paramDifference = point[i] - point2[i]
      distance += pow(paramDifference, 2)
    return math.sqrt(distance)
  
  
  class Classifier(object):
    
    def __init__(dataPoints):
      self.dataPoints = dataPoints
      
    def classify(point, k):
      
  
subject: Add Euclidean distance measure to core.py