旧版本的 Python 文档中有一个itertools例子 http://docs.python.org/release/2.3.5/lib/itertools-example.html:
from itertools import islice
def window(seq, n=2):
"Returns a sliding window (of width n) over data from the iterable"
" s -> (s0,s1,...s[n-1]), (s1,s2,...,sn), ... "
it = iter(seq)
result = tuple(islice(it, n))
if len(result) == n:
yield result
for elem in it:
result = result[1:] + (elem,)
yield result
文档中的内容更加简洁,并且使用itertools
我想效果会更好。
如果你的迭代器是一个简单的列表/元组使用指定窗口大小滑动它的简单方法是:
seq = [0, 1, 2, 3, 4, 5]
window_size = 3
for i in range(len(seq) - window_size + 1):
print(seq[i: i + window_size])
Output:
[0, 1, 2]
[1, 2, 3]
[2, 3, 4]
[3, 4, 5]