网络爬虫在列表之间提取

Question

我正在 python 中编写网络爬虫。我希望获取 <li> </li> 标签之间的所有内容。例如：

<li>January 13, 1991: At least 40 people <a href ="......."> </a> </li>

所以我想：

a.)提取日期-并将其转换为dd/mm/yyyy格式

b.)人前数

soup = BeautifulSoup(page1)
h2 =soup.find_all("li")
count = 0
while count < len(h2):
    print (str(h2[count].get_text().encode('ascii', 'ignore')))
    count += 1

我现在只能提取文本。

Answer 1

获取 .text、split the string by the first occurence of :, convert the date string to datetime using strptime() specifying existing %B %d, %Y format, then format it to string using strftime() specifying the desired %d/%m/%Y format and extract the number using At least (\d+) regular expression where (\d+) is a capturing group 匹配一个或多个数字的文本：

from datetime import datetime
import re

from bs4 import BeautifulSoup


data = '<li>January 13, 1991: At least 40 people <a href ="......."> </a> </li>'
soup = BeautifulSoup(data)

date_string, rest = soup.li.text.split(':', 1)

print datetime.strptime(date_string, '%B %d, %Y').strftime('%d/%m/%Y')
print re.match(r'At least (\d+)', rest.strip()).group(1)

打印：

13/01/1991
40

网络爬虫在列表之间提取

Web crawler to extract in between the list

python

parsing

beautifulsoup

html-parsing

web-scraping