code: def prepare(self, node):
          
          super(ArgumentEffects, self).prepare(node)
          for n in self.global_declarations.values():
              fe = FunctionEffects(n)
              self.node_to_functioneffect[n] = fe
              self.result.add_node(fe)
docs: Initialise arguments effects as this analyse is inter-procedural.
  
          Initialisation done for Pythonic functions and default value set for
          user defined functions.