Question

我写的for循环有问题，我无法通过for循环返回到第一个for语句：

def output(query,page,max_page):
    """
    Parameters:
        query: a string
        max_page: maximum pages to be crawled per day, integer

    Returns:
    List of news dictionaries in a list: [[{...},{...}..],[{...},]]
    """
    news_dicts_all = []
    news_dicts = []
    # best to concatenate urls here
    date_range = get_dates()
    for date in get_dates():
        s_date = date.replace(".","")
        while page < max_page:
            url = "https://search.naver.com/search.naver?where=news&query=" + query + "&sort=0&ds=" + date + "&de=" + date + "&nso=so%3Ar%2Cp%3Afrom" + s_date + "to" + s_date + "%2Ca%3A&start=" + str(page)
            header = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36'}
            req = requests.get(url,headers=header)
            cont = req.content
            soup = BeautifulSoup(cont, 'html.parser')
            for urls in soup.select("._sp_each_url"):
                try:
                    if urls["href"].startswith("https://news.naver.com"):
                        news_detail = get_news(urls["href"])
                        adict = dict()
                        adict["title"] = news_detail[0]
                        adict["date"] = news_detail[1]
                        adict["company"] = news_detail[3]
                        adict["text"] = news_detail[2]
                        news_dicts.append(adict)
                except Exception as e:
                    continue
            page += 10
        news_dicts_all.append(news_dicts)
    return news_dicts_all

我已经执行了代码，看来page +=将代码返回到“ while”部分，但是在页面到达{ {1}}。

我本质上想要的是代码在到达for date in get_dates()之后返回到max_page，但是我不知道该怎么做。

Answer 1

您永远不会重置page，因此当它移至for循环中的下一个日期时，page > max_page已经为真，因此它将完全跳过while循环。

您将需要执行类似的操作，例如将page参数更改为start_page，然后在for循环开始时使用page = start_page。

Python-如何使用+ =返回到for循环

1 个答案: