#!/usr/bin/python
# -*- coding:UTF-8 -*-

 

list = ["a","b","c"]
list2 = ["a","c",list]
print list[0]
list3 = [i for i in list if i not in list2]
print list
print list2
print list3

结果:

a
['a', 'b', 'c']
['a', 'c', ['a', 'b', 'c']]
['b']