Python实战之异步获取中国天气信息

BaseUrl = "http://wthrcdn.etouch.cn/weather_mini?city={}"

{'data':
 {'yesterday': 
 {'date': '5日星期六', 'high': '高温 16℃', 'fx': '东北风', 'low': '低温 9℃', 'fl': '<![CDATA[3级]]>', 'type': '多云'}, 
 'city': '九江',
  'forecast': [{'date': '6日星期天', 'high': '高温 12℃', 'fengli': '<![CDATA[3级]]>', 'low': '低温 7℃', 'fengxiang': '东北风', 'type': '中雨'}, 
 {'date': '7日星期一', 'high': '高温 14℃', 'fengli': '<![CDATA[2级]]>', 'low': '低温 7℃', 'fengxiang': '北风', 'type': '多云'}, 
 {'date': '8日星期二', 'high': '高温 19℃', 'fengli': '<![CDATA[2级]]>', 'low': '低温 8℃', 'fengxiang': '东南风', 'type': '晴'}, 
 {'date': '9日星期三', 'high': '高温 21℃', 'fengli': '<![CDATA[2级]]>', 'low': '低温 11℃', 'fengxiang': '东南风', 'type': '晴'},
 {'date': '10日星期四', 'high': '高温 23℃', 'fengli': '<![CDATA[1级]]>', 'low': '低温 11℃', 'fengxiang': '南风', 'type': '多云'}
 ], 
 'ganmao': '感冒多发期，适当减少外出频率，适量补充水分，适当增减衣物。', 'wendu': '8'}, 'status': 1000, 'desc': 'OK'}

import requests
from datetime import datetime

class GetWeather(object):

    urlWheather = "http://wthrcdn.etouch.cn/weather_mini?city={}"
    requests = requests
    error = {}
    today = datetime.today().day
    weekday = datetime.today().weekday()
    week = {0:"星期一",1:"星期二",2:"星期三",3:"星期四",4:"星期五",5:"星期六",6:"星期天"}

    def __getday(self)->str:
        day = str(self.today)+"日"+self.week.get(self.weekday)
        return day


    def get_today_wheather(self,city:str)->dict:

        data = self.getweather(city)
        data = data.get("data").get("forecast")
        today = self.__getday()
        for today_w in data:
            if(today_w.get("date")==today):
                return today_w

    def getweather(self,city:str,timeout:int=3)->dict:
        url = self.urlWheather.format(city)
        try:
            resp = self.requests.get(url,timeout=timeout)
            jsondata =  resp.json()
            return jsondata
        except Exception as e:
            self.error['error'] = "天气获取异常"
            return self.error
    def getweathers(self,citys:list,timeout:int=3):
        wheathers_data = {}
        for city in citys:
            url = self.urlWheather.format(city)
            try:
                resp = self.requests.get(url=url,timeout=timeout)
                wheather_data = resp.json()
                wheathers_data[city]=wheather_data
            except Exception as e:
                self.error['error'] = "天气获取异常"
                return self.error

        return wheathers_data



if __name__ == '__main__':
    getwheather = GetWeather()

    start = time.time()
    times = 1
    for i in range(5000):
        data = getwheather.get_today_wheather("九江")
        if((times%100==0)):
            print(data,"第",times,"次访问")
        times+=1

    print("访问",times,"次耗时",time.time()-start,"秒")

import time

import aiohttp
from datetime import datetime
import asyncio

BaseUrl = "http://wthrcdn.etouch.cn/weather_mini?city={}"

WeekIndex = {0:"星期一",1:"星期二",2:"星期三",3:"星期四",4:"星期五",5:"星期六",6:"星期天"}

today = datetime.today().day
day = str(today)+"日"+WeekIndex.get(datetime.today().weekday())

TIMES = 0

async def request(city:str,semaphore:asyncio.Semaphore,timeout:int = 3):
    url = BaseUrl.format(city)
    try:
        async with semaphore:
            async with aiohttp.request("GET", url) as resp:
                data = await resp.json(content_type='')
                return data
    except Exception as e:
        raise e


def getwheater(task):
    data = task.result()
    return data

def get_today_weather(task):
    global TIMES
    data = task.result() #得到返回结果

    data = data.get("data").get("forecast")

    for today_w in data:
        if (today_w.get("date") == day):
            TIMES+=1#只有IO操作的时候才会切换，所以这个++操作还是一个原子性操作
            if(TIMES%100==0):
                print(today_w,"第",TIMES,"次访问")
            return today_w



if __name__ == '__main__':
    semaphore = asyncio.Semaphore(500)
    #操作系统上限是同一个时刻509/1024个并发,windows509 linux 1024
    start = time.time()
    tasks = []
    for i in range(5000):
        c = request("九江",semaphore,3)
        task = asyncio.ensure_future(c)
        task.add_done_callback(get_today_weather)
        tasks.append(task)
    loop = asyncio.get_event_loop()
    loop.run_until_complete(asyncio.wait(tasks))
    print("耗时",time.time() - start,"秒")