python中list合并问题

[[1,2],[1,2],[1,2]]
[[3,4,5],[3,4,5],[3,4,5]]
[[1,2,3,4,5],[1,2,3,4,5],[1,2,3,4,5]]
前面两个list合并成第三个list改怎么写啊，万分感谢

 z = numpy.concatenate([x, y], axis=1)

List1 = [[1,2], [1,3], [1,4]]
List2 = [[3,3,5], [4,4,5], [3,4,3]]
List = []
for i, v in enumerate(List1):
List.append(v + List2[i])
print List

挖个坟
List1 = [[1,2], [1,3], [1,4]]
List2 = [[3,3,5], [4,4,5], [3,4,3]]
[*map(lambda x,y:x+y,List1,List2)]