[python爬虫]aiohttp+asynci房天下,将数据存

# -*- coding: utf-8 -*-
"""
 @Time   : 2020/6/19 16:49 
 @Athor   : LinXiao
 @功能   :
"""
# ------------------------------
from asyncio import sleep
from pprint import pprint

"""

2940条：
Cost 3.7898309230804443 seconds
"""
from lxml import etree
from time import time
import asyncio
import aiohttp
import asyncio
from fake_useragent import UserAgent
from motor.motor_asyncio import AsyncIOMotorClient

# url = 'https://github.com/StackExchange/StackExchange.Redis/issues/201'
url='https://hui.lianjia.com/ershoufang/'


# 抓取页面内容
async def fetch_content(url):
    ua=UserAgent()

    headers={
        'User-Agent': ua.random
    }
    async with aiohttp.ClientSession(headers=headers) as session:
        async with session.get(url) as response:
            sleep(3)
            res=await response.text()
            pprint(res)
            return res


# 解析页面内容
async def parse(url):
    page=await fetch_content(url)

    xpath_house="//div[@class='info clear']/div[@class='title']/a"
    xpath_house_price="//div[@class='totalPrice']/span"
    # xpath_pages = '//*[@id="content"]/div/div[1]/div[2]/a'

    fetch_list=[]
    result=[]

    for p in range(1, 300):
        fetch_list.append(url + f'//pg{p}//')

    tasks=[fetch_content(url) for url in fetch_list]
    pages=await asyncio.gather(*tasks)

    for page in pages:
        html=etree.HTML(page)
        for element_house, element_house_price in zip(html.xpath(xpath_house), html.xpath(xpath_house_price)):
            result.append(f'{element_house.text}:{element_house_price.text}万')
    pprint(type(result))
    return result

# 保存到mongo数据库中
async def save(url):
    db_url='localhost'
    db_port=27017
    db_name="linxao1"
    db_collection="lx21"
    # 建立连接
    client=AsyncIOMotorClient(db_url, db_port)

    # 连接某个库名字
    db=client[db_name][db_collection]

    list1=[]
    result=await parse(url)
    pprint(result)
    for i, house in enumerate(result, 1):
        print(i, house)
        dic={"_id": i,
             "context": house
             }
        pprint(dic)
        list1.append(dic)
    pprint(list1)
    await db.insert_many([i for i in list1])
    print('inserted %d docs' % (len(result)))

    document={'key': 'value'}
    result=await db.test_collection.insert_one(document)
    print('result %s' % repr(result.inserted_id))

async def do_insert():
    # 建立连接
    client=AsyncIOMotorClient('localhost', 27017)

    # 连接某个库名字
    db=client.linxiao
    # result = await db.collection111.insert_many(
    # lx 为linxiao库下面的lx集合
    result=await db.lx.insert_many(
        [{'i': i} for i in range(20)])  # insert_many可以插入一条或多条数据，但是必须以列表(list)的形式组织数据
    print('inserted %d docs' % (len(result.inserted_ids),))

def main():
    loop=asyncio.get_event_loop()
    start=time()
    # loop.run_until_complete(parse(url))
    # loop.run_until_complete(fetch_content(url))
    loop.run_until_complete(save(url))
    end=time()
    print('Cost {} seconds'.format(end - start))
    loop.close()

if __name__ == '__main__':
    main()