Python＆BeautifulSoup 4-循环返回重复结果

时间：2019-03-16 19:40:30

标签： python web-scraping beautifulsoup

我正在尝试从6pm.com抓取，但遇到了一个问题-我的循环似乎返回了重复的结果，例如当不同的产品只应出现一次时，它会重复多次重复同一产品。

这是我的代码：

url_list1 = ['https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=1',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=2',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=3',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=4',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=5',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=6',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=7',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=8',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=9',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=10',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=11',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=12',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=13',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=14',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=15',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=16',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=17',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=18',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=19',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=20',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=21',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=22',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=23',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=24',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=25',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=26',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=27',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=28',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=29',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=30',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=31',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=32',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=33',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=34',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=35',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=36',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=37',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=38',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=39',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=40',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=41',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=42',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=43',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=44',
         'https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?&p=45'
]


url_list2 = []

for url1 in url_list1:
    data1 = requests.get(url1)
    soup1 = BeautifulSoup(data1.text, 'html.parser')


    productUrls = soup1.findAll('article')


    for url2 in productUrls:
        get_urls = "https://www.6pm.com"+url2.find('a', attrs={'itemprop': 'url'})['href']
        url_list2.append(get_urls)

print(url_list2)

因此，第一部分（url_list1）基本上是一个链接列表。每个链接都指向一个包含100个所选品牌产品的页面。当我单击每个链接并在浏览器中打开时，每个页面包含不同的产品，并且没有重复项（我知道）。

接下来，我初始化一个空列表（url_list2），在其中尝试存储所有实际的产品URL（因此此列表应包含46页* 100个产品=大约4600个产品URL）。

第一个“ for”循环遍历url_list1中的每个链接。 productUrls变量是一个列表，应该将其存储在46页中的每页上的所有“文章”元素。

第二个嵌套的“ for”循环遍历productUrls列表并构造实际的产品URL。然后应该将构造的产品URL附加到我先前初始化的空列表url_list2上。

用print语句测试结果，我注意到产品是重复的，而不是不同的。

如果在浏览器的url_list1中手动打开每个url时，为什么我可以在每个页面上看到不同的产品并且没有发现重复项，为什么会发生这种情况？

非常感谢您的帮助。

2 个答案:

答案 0 :(得分：1)

发生的事情是，您在浏览器中看到的页面与请求得到的页面不同。要解决该问题，您必须保持会话（请求）有效。

尝试一下，它对我有用。将您的big for循环替换为：

with requests.Session() as s:    # <--- here we create a session that stays alive
        for url1 in url_list1:
            data1 = s.get(url1)  # <--- here we call the links with the same session
            soup1 = BeautifulSoup(data1.text, 'html.parser')

            productUrls = soup1.findAll('article')

            for url2 in productUrls:
                get_urls = "https://www.6pm.com"+url2.find('a', attrs={'itemprop': 'url'})['href']
                url_list2.append(get_urls)

祝你好运！

答案 1 :(得分：1)

在这种情况下，您可以做得更好。您不需要将所有urls都放在列表中。请尝试以下代码，这是获得结果的简单方法。

from bs4 import BeautifulSoup
import re
import requests
headers = {'User-Agent':
       'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36'}

page = "https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso"

url_list2 = []
page_num = 1
session = requests.Session()
while page_num <47:
    pageTree = session.get(page, headers=headers)
    pageSoup = BeautifulSoup(pageTree.content, 'html.parser')
    productUrls = pageSoup.findAll('article')
    for url2 in productUrls:
        get_urls = "https://www.6pm.com"+url2.find('a', attrs={'itemprop': 'url'})['href']
        url_list2.append(get_urls)

    page = "https://www.6pm.com/filters/men-shoes/CK_XAVpbwAOoCe4VJIQl5AeABqkZoB4_9RFN-hasCYIahQlrmQO7H4gkb7sa5RV9uQ-LIf8DgAG2BqcfmAGBD-IEoAGTBqcHoALTEqsBjBsBgw_SBs0Z4QbsHK0UyiHvJMABAuICAwELGA.zso?p={}".format(page_num)
    page_num +=1

print(url_list2)
print(len(url_list2))

让我知道是否有帮助。

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