Python：嵌套列表理解

Question

我有一個無法解決的嵌套列表問題。

輸入

---

li=
[1, 2, 3, 4]
[5, 6, 7, 8]
[9,10,11,12]

---

newList = [[0 if kk==6 or kk==7 else kk for kk in x] for x in li]

產量

[1, 2, 3, 4]
[5, 0, 0, 8]
[9,10,11,12]

我想用列表切片和索引打印此輸出

和另一個輸出

[1,2,3,4,8,12,11,10,9,5]

像這樣1

Answer 1

切片numpy數組

a=[[1, 2, 3, 4],
[5, 0, 0, 8],
[9,10,11,12]]
b=np.array(a) 
list(b[0:1][0]) + list(b[1:,-1]) + list(b[-1:][0])[-2::-1] + list(b[1:,0])[-2::-1]

產量

[1, 2, 3, 4, 8, 12, 11, 10, 9, 5]