Python爬取天氣網歷史天氣數據
阿新 • • 發佈：2017-12-05
ast 信息 爬蟲 cmake tex for roc ins fonts
使用Python的requests 和BeautifulSoup模塊，Python 2.7.12可在命令行中直接使用pip進行模塊安裝。爬蟲的核心是利用BeautifulSoup的select語句獲取需要的信息。
pip install requests
pip install bs4以武漢市2017年5~7月的歷史為例爬取天氣網中武漢市的歷史天氣數據。
7月對應的網址為http://lishi.tianqi.com/wuhan/201707.html
1.requests模塊獲取網頁內容
url=‘http://lishi.tianqi.com/wuhan/201707.html‘
response = requests.get(url)
soup = BeautifulSoup(response.text, ‘html.parser‘) 2.利用.select語句找到網頁中天氣數據所在的div
weather_list = soup.select(‘div[class="tqtongji2"]‘) 
3.找出日期、最高氣溫、最低氣溫、天氣等數據，用li.string獲取li中的信息。
ul_list = weather.select(‘ul‘)
for ul in ul_list:
li_list= ul.select(‘li‘)
for li in li_list:
li.string.encode(‘utf-8‘) #具體的天氣信息
具體代碼實現如下：
#encoding:utf-8
import requests
from bs4 import BeautifulSoup
urls = ["http://lishi.tianqi.com/wuhan/201707.html",
"http://lishi.tianqi.com/wuhan/201706.html",
"http://lishi.tianqi.com/wuhan/201705.html"]
file = open(‘wuhan_weather.csv‘,‘w‘)
for url in urls:
response = requests.get(url)
soup = BeautifulSoup(response.text, ‘html.parser‘)
weather_list = soup.select(‘div[class="tqtongji2"]‘)
for weather in weather_list:
weather_date = weather.select(‘a‘)[0].string.encode(‘utf-8‘)
ul_list = weather.select(‘ul‘)
i=0
for ul in ul_list:
li_list= ul.select(‘li‘)
str=""
for li in li_list:
str += li.string.encode(‘utf-8‘)+‘,‘
if i!=0:
file.write(str+‘\n‘)
i+=1
file.close() 最後的結果：
Python爬取天氣網歷史天氣數據