Python爬取所有城市的aqi值

# -*- coding: utf-8 -*-
# author：baoshan

import requests
from bs4 import BeautifulSoup

def get_city_aqi(city_pinyin):
    url = 'http://pm25.in/'+city_pinyin
    r = requests.get(url, timeout=30)
    soup = BeautifulSoup(r.text, 'lxml')
    div_list = soup.find_all('div', {"class":"span1"})
    city_aqi = []
    for i in range(8):
        div_content = div_list[i]
        caption = div_content.find('div', {"class": "caption"}).text.strip()
        value = div_content.find('div', {"class":"value"}).text.strip()
        city_aqi.append((caption, value))
    return city_aqi


def get_all_cities():
    url = 'http://pm25.in/'
    city_list = []
    r = requests.get(url, timeout=30)
    soup = BeautifulSoup(r.text, 'lxml')
    city_div = soup.find_all('div', {'class':'bottom'})[1]
    city_link_list = city_div.find_all('a')
    for city_link in city_link_list:
        city_name = city_link.text
        city_pinyin = city_link['href'][1:]
        city_list.append((city_name, city_pinyin))
    return city_list

def main():
    city_list = get_all_cities()
    for city in city_list:
        city_name = city[0]
        city_pinyin = city[1]
        city_aqi = get_city_aqi(city_pinyin)
        print(city_name, city_aqi)

if __name__ == '__main__':
    main()

参考自：小象学院的AQI空气质量指数计算