old_contents: """This module provides plugins for NEU metrics."""
  
  import kurt
  from hairball.plugins import HairballPlugin
  
  
  class Variables(HairballPlugin):
  
      """Plugin that counts the number of variables in a project."""
  
      def __init__(self):
          super(Variables, self).__init__()
          self.total = 0
  
      def finalize(self):
          """Output the number of variables in the project."""
          print("Number of variables: %i" % self.total)
  
      def analyze(self, scratch):
          """Run and return the results of the Variables plugin."""          
          self.total = len(scratch.variables)
          for x in scratch.sprites:
              self.total += len(x.variables)
  
new_contents: """This module provides plugins for NEU metrics."""
  
  import kurt
  from hairball.plugins import HairballPlugin
  
  
  class Variables(HairballPlugin):
  
      """Plugin that counts the number of variables in a project."""
  
      def __init__(self):
          super(Variables, self).__init__()
          self.total = 0
  
      def finalize(self):
          """Output the number of variables in the project."""
          print("Number of variables: %i" % self.total)
  
      def analyze(self, scratch):
          """Run and return the results of the Variables plugin."""          
          self.total = len(scratch.variables)
          for x in scratch.sprites:
              self.total += len(x.variables)
  
  class Lists(HairballPlugin):
  
      """Plugin that counts the number of lists in a project."""
  
      def __init__(self):
          super(Lists, self).__init__()
          self.total = 0
  
      def finalize(self):
          """Output the number of lists in the project."""
          print("Number of lists: %i" % self.total)
  
      def analyze(self, scratch):
          """Run and return the results of the Lists plugin."""
          self.total = len(scratch.lists)
          for x in scratch.sprites:
              self.total += len(x.lists)
subject: Add Lists class