text: 
  #Y = Species("Y",U_Y)
  class Species:
      def __init__(self, name, U):
          self.name = name
          #Y.name = "Y"
          self.U = U
          #Y.U = U_Y
          self.behaviour = None
      
      def get_U(self):
          return self.U
          #Y.get_U returns U_Y
  
      #Y.set_U(U)
      def set_U(self, U):
          self.U = U
          #returns Y.U = U
  
      def get_name(self):
          return self.name
          #Y.get_name returns Y.name which is "Y"
      
      #Y.set_behaviour(Y_behaviour)
      def set_behaviour(self, behaviour):
          self.behaviour = behaviour
          #Y.set_behaviour = Y_behaviour
          