python将一组数分成每3个一组的实例

如下所示：

a = [1,2,3,4,5,6,7,8,9,10,11]
step = 3
b = [a[i:i+step] for i in range(0,len(a),step)]
print(b)

结果如下：

[[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11]]
>>> b[1]
[4, 5, 6]

来源：https://blog.csdn.net/Mr_Cat123/article/details/80584988