python爬虫xpath爬取2345历史天气

要使用Python爬虫和XPath来爬取2345历史天气，你可以按照以下步骤进行操作：

1. 首先，你需要使用Python的requests库发送HTTP请求来获取网页的源代码。你可以使用以下代码示例：

import requests

url = 'http://example.com'  # 替换为你要爬取的网页URL
response = requests.get(url)
html_data = response.text

2. 接下来，你需要使用XPath来解析网页的源代码并提取所需的数据。根据引用中的示例代码，你可以使用以下代码示例：

from lxml import etree

tree = etree.HTML(html_data)
tr_list = tree.xpath('//table[@class="history-table"]/tr')

for tr in tr_list//text()')  # 空气质量指数
    lst = [d1<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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