定義列表的列表並遍歷它

Question

我怎麼能遍歷這樣的列表的列表：

kinds = [[1],[2],[3]] 
1 = [[x],[y],[z]] 
2 = [[k],[l],[m]] 
3 = [[z],[y],[w]] 
for i in kinds: 
    for j in in each element of kinds: 
     #do this 

Answer 1

對於一個簡單的嵌套列表，這將做到：

kinds = [[1],[2],[3]] 
for i in kinds: # i is a list, so iterate it! 
    for j in i: # assumes kinds is list of lists (iterable of iterables) 
     # do stuff 

Answer 2

你不能名字與這裏只是一個單一的number.But一個變量是你的問題的解決方案，藉此例如：

var1 = [1,2,4] 
var2 = [6,2,1] 
var3 = ['NN','VBG','JJR'] 
kinds = [var1,var2,var3] 
for list in kinds: 
    for items in list: 
     print (items) 

輸出：

1 
2 
4 
6 
2 
1 
NN 
VBG 
JJR