Python:索引列表列表

Question

简单的问题,我有一个列表清单:

x = [['1','2','3'],['4','5','6'],['7','8','9']]

在单个for循环中索​​引每个列表的最简单方法是什么？例如:

for i in x:
    print 1st_list_in_list
    print 2nd_list_in_list
    print 3rd_list_in_list

---

编辑

让我进一步阐述,我希望打印每个列表是如何的,例如:

for i in x:
    print 1st_list_in_list
    print 2nd_list_in_list

会回来:

1,2,3
4,5,6

Answer 1

试试这个:

for l in x:
    print ', '.join(map(str, l))

输出:

1, 2, 3
4, 5, 6
7, 8, 9

Answer 2

你几乎拥有它:

# python
x = [['1','2','3'],['4','5','6'],['7','8','9']]

for i in x:
  print i[0]
1
4
7

for i in x:
  print i
['1', '2', '3']
['4', '5', '6']
['7', '8', '9']

for i in x[0]:
  print i
1
2
3