python每隔几步

在Python中，使用切片操作可以实现每隔几步的取值。可以使用以下代码来实现：

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)

输出结果为：[[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11]]

这里的步长是通过`step`变量控制的，`range(0,len(a),step)`会生成一个从0到len(a)的序列，步长为step。然后使用列表推导式`[a[i:i+step] for i in range(0,len(a),step)]`来取出对应步长的子列表。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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