old_contents: #!/usr/bin/env python
  
  from nodes import Node
  
  class Iterator(Node):
      char = "o"
      args = 0
      results = 1
      contents = 0
      
      def func(self):
          """contents += 1
  return contents-1"""
          print(Iterator.contents)
          Iterator.contents += 1
          return Iterator.contents-1
new_contents: #!/usr/bin/env python
  
  from nodes import Node
  
  class Iterator(Node):
      char = "o"
      args = 0
      results = 1
      contents = 0
      
      def func(self):
          """contents += 1
  return contents-1"""
          Iterator.contents += 1
          return Iterator.contents-1
subject: Remove debugging