矩阵转换

arr = [ [1,2,3], [4,5,6] ]
for i in arr:
    print(i)
print("- " *7)


# 初始化一个矩阵
tm = [ [0 for col in range( len(arr) )] for row in range(len(arr[0])) ]

for a in tm:
    print(a)
    
# 索引化原矩阵, 索引对换
for i,row in enumerate(tm):
    for j,col in enumerate(row):
        tm[i][j] = arr[j][i]

print("- " * 7)
for a in tm:
    print(a)