李沛昂

1. m=[[1,2,3,4],[5,6,7,8],[9,10,11,12]]
   
2. for i in range(len(m)):
   
3.     for j in range(len(m[0])):
   
4.         print(f"list[{i}][{j}]={m[i][j]}")

複製代碼