算法优化：转置矩阵和转置方阵打印

转置方阵：

lst = [1,2,3,4,5,6,7,8,9]
width = 3

for i in range(0,len(lst),width):
    print(lst[i:i+3])

print('----------------')

width = 3
lines = len(lst)//width

for i in range(lines):
    print(lst[i::3])

运行结果：

[1, 2, 3]
[4, 5, 6]
[7, 8, 9]
----------------
[1, 4, 7]
[2, 5, 8]
[3, 6, 9]

转置矩阵：

lst = [1,2,3,4,5,6]
width = 3
lines = int(len(lst)/width)
i = 0

for _ in range(lines):
    print(lst[i:i+3])
    i = i+3

print('----------')

width = 2
lines = int(len(lst)/width)

for i in range(lines):
    print(lst[i::3])

运行结果：

[1, 2, 3]
[4, 5, 6]
----------
[1, 4]
[2, 5]
[3, 6]