code: def append(self, name, value):
          
          if self.vars is None:
              self.vars = {}
          if name in self.vars:
              self.vars[name].append(value)
          else:
              self.vars[name] = [value]
docs: Appends the given value to the list variable with the given name.
  
          :type  name: string
          :param name: The name of the variable.
          :type  value: object
          :param value: The appended value.