本文实例讲述了python实现把二维列表变为一维列表的方法。分享给大家供大家参考，具体如下：
c = [[1,2,3], [4,5,6], [7,8,9]]
1.用列表推导式
>>> [n for a in c for n in a ] [1, 2, 3, 4, 5, 6, 7, 8, 9]
2.用嵌套循环展开
>>> result=[] >>> for a in c: for n in a: result.append(n) result #result的位置没有和第一个for对齐，所以结果不理想 [1] [1, 2] [1, 2, 3] [1, 2, 3, 4] [1, 2, 3, 4, 5] [1, 2, 3, 4, 5, 6] [1, 2, 3, 4, 5, 6, 7] [1, 2, 3, 4, 5, 6, 7, 8] [1, 2, 3, 4, 5, 6, 7, 8, 9]
3.用sum对列表的求和
>>> sum(c,[]) [1, 2, 3, 4, 5, 6, 7, 8, 9]
4.导入相关的包
>>>from itertools import chain >>>list(chain(*vec)) [1,2, 3, 4, 5, 6, 7, 8, 9] >>>from itertools import chain >>>list(chain(*vec)) [1,2, 3, 4, 5, 6, 7, 8, 9]
希望本文所述对大家Python程序设计有所帮助。
