list 中 套着 list

l = [[1,2],[3,4],[[5,6],[7,8]]] # 如何打印输出字符 5

print(l[2][0][0])			# 该如何理解呢?

 

 

去掉外层的嵌套

xx = [[1],[2]]

yy= [i[0] for i in xx]

print(xx)

print(yy)

 

 

REF

http://www.voidcn.com/article/p-zijkotyk-bz.html