code: def postinit(self, expr=None, globals=None, locals=None):
          
          self.expr = expr
          self.globals = globals
          self.locals = locals
docs: Do some setup after initialisation.
  
          :param expr: The expression to be executed.
          :type expr: NodeNG or None
  
          :param globals:The globals dictionary to execute with.
          :type globals: NodeNG or None
  
          :param locals: The locals dictionary to execute with.
          :type locals: NodeNG or None