python訪問列表的行、列和元素的方法

g=[[3, 0, 8, 4], [2, 4, 5, 7], [9, 2, 6, 3], [0, 3, 1, 0]]

1.訪問行

for i in range(len(g)):
    print(g[i]) # 輸出每一行

2.訪問列

for i in range(len(g)):
    print(x[i] for x in g) # 輸出每一列

3.轉化為np數組訪問列

import numpy as np
g=np.array(g)
for i in range(len(g)):
    print(g[:,i]