Python通过islice循环读取20条记录

Question

我正在读取TXT文件（1GB）。 内容是很多URL记录。 我想调用一个函数以返回20条记录。 如何修改代码以允许他每次返回剩余的N条记录？ 这让我感到困惑。

from itertools import islice

def iter_list(start，stop):
    url = []
    with open("domain.txt") as file:
        for line in islice(file, start, stop):
            url.append(line)
        return url

 def get_html(url): req = requests.get(url) print(req.status_code) """ I want to extract 20 pieces to process after the cycle is completed. I don't know if this expression can be understood. """ url = iter_list(1, 20) for i in url: get_html(i.strip()) 

Answer 1

from itertools import islice

def iter_list(start，stop):
    url = []
    tmp = []
    with open("domain.txt") as file:
        for line in islice(file, start, stop):
            url.append(line)
            if len(url) == 20:
               url.append(tmp)
               tmp = []
        return url


for i in iter_list(start，stop):
    print(i)