python爬虫实例

import re

import requests
from bs4 import BeautifulSoup

# 主方法
def main():
    # 给请求指定一个请求头来模拟chrome浏览器
    headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36'}
    page_max = 100
    for i in range(1, int(page_max) + 1):
        if i == 1:
            house = 'https://cc.lianjia.com/ershoufang/erdaoqu/'
        else:
            house = 'https://cc.lianjia.com/ershoufang/erdaoqu/pg'+str(i)
        res = requests.get(house, headers=headers)
        soup = BeautifulSoup(res.text, 'html.parser')
        li_max = soup.find('ul', class_='sellListContent').find_all('li')
        for li in li_max:
            try:
                house_param = {}
                content = li.find('div', class_='houseInfo').text
                content = content.split("|")
                house_param['housing_estate'] = content[0]
                house_param['square_metre'] = re.findall(r'-?\d+\.?\d*e?-?\d*?', content[2])[0]
                # --------------------------------------------------------#
                position = li.find('div', class_='positionInfo').find('a').text
                house_param['position'] = position
                # --------------------------------------------------------#
                totalprice = li.find('div', class_='totalPrice').text
                house_param['total_price'] = re.sub("\D", "", totalprice)
                unitprice = li.find('div', class_='unitPrice').text
                house_param['unit_price'] = re.sub("\D", "", unitprice)
                # --------------------------------------------------------#
                follow = li.find('div', class_='followInfo').text
                follow = follow.split("/")
                house_param['follow'] = re.sub("\D", "", follow[0])
                house_param['take_look'] = re.sub("\D", "", follow[1])
                # --------------------------------------------------------#
                title_src = li.find('div', class_='title').find('a').attrs['href']
                house_param['url'] = re.sub("\D", "", title_src)
                res = requests.get(title_src, headers=headers)
                soup = BeautifulSoup(res.text, 'html.parser')
                # --------------------------------------------------------#
                pub_date = soup.find('div', class_='transaction').find_all('li')[0].find_all('span')[1].text
                house_param['pub_date'] = pub_date
                print(house_param)
            except Exception as e:
                print(e)

if __name__ == '__main__':
    main()