二维数组旋转90°

a =[ [col for col in  range(4)] for row in  range(4)]
for i in a :
    print(i)
print('------------------')
for h,zhi in enumerate(a):
    for l in range(h,len(zhi)):
        tem = a[l][h]
        a[l][h] = a[h][l]
        a[h][l] = tem
for j in a :
    print(j)