new_contents: #!/usr/bin/env python
  
  from nodes import Node
  
  class NotEquals(Node):
      char = "N"
      args = 2
      results = 1
      
      @Node.test_func([1,2], [1])
      @Node.test_func([1.0,1], [0])
      @Node.test_func(["test","test"], [0])
      def func(self, a,b):
          """a!=b. Returns an int"""
          return (a!=b)+0
subject: Add not-equals node