用python爬取天气网长沙天气信息并保存到csv

好的，以下是实现这个功能的Python代码：

import requests
import csv

# 设置请求头，伪装成浏览器访问
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3'}

# 发送请求，获取长沙天气信息
url = 'http://www.weather.com.cn/weather/101250101.shtml'
response = requests.get(url, headers=headers)
response.encoding = 'utf-8'
html = response.text

# 解析HTML，获取长沙天气信息
from bs4 import BeautifulSoup

soup = BeautifulSoup(html, 'html.parser')
weather_list = soup.select('.t ul li')
data_list = []
for weather in weather_list:
    date = weather.select('.time')[0].text
    detail_weather = weather.select('.wea')[0].text
    temperature = weather.select('.tem')[0].text.replace('\n', '').strip()
    wind_direction = weather.select('.win span')[0].text
    wind_power = weather.select('.win span')[1].text
    data_list.append([date, detail_weather, temperature, wind_direction, wind_power])

# 保存天气信息到csv文件中
with open('weather.csv', 'w', encoding='utf-8', newline='') as f:
    writer = csv.writer(f)
    writer.writerow(['日期', '天气', '温度', '风向', '风力'])
    writer.writerows(data_list)

以上代码中，我们使用requests库发送请求，获取长沙天气信息的网页源代码。然后使用BeautifulSoup库解析HTML，从中获取长沙天气信息。最后使用csv库将天气信息保存到csv文件中。

可以根据需要修改代码中的url、headers、保存的文件名等参数。