import requests
import re
import json
import time
from bs4 import BeautifulSoup
from pyquery import PyQuery as pq
from lxml import etree# 获取页面源码
def get_one_page(url):try:headers = {  # 伪装请求头'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.75 Safari/537.36'}response = requests.get(url, headers=headers)  # 构造响应if response.status_code == 200:  # 判断状态码return response.textreturn Noneexcept requests.exceptions.RequestException as r:return None# 正则表达式提取源码关键信息
def parse_one_page(html):# 正则表达式查询目标信息pattern = re.compile('<dd>.*?board-index.*?>(\d+)</i>.*?data-src="(.*?)".*?name"><a.*?>(.*?)</a>.*?star">(.*?)</p>.*?releasetime">(.*?)</p>.*?integer">(.*?)</i>.*?fraction">(.*?)</i>.*?</dd>', re.S)items = re.findall(pattern, html)for item in items:# 包含yield表达式的函数是特殊的函数，叫做生成器函数(generator function)，被调用时将返回一个迭代器（iterator），调用时可以使用next或send(msg)。它的用法与return相似，区别在于它会记住上次迭代的状态，继续执行。yield{  # yield关键字'index': item[0],'image': item[1],'title': item[2].strip(),'actor': item[3].strip()[3:],  # if len(item[3])>3 else '','time': item[4].strip()[5:],  # if len(item[4])>5 else '','score': item[5].strip()+item[6].strip()}#Xpath提取信息
def xpath_demo(html):html=etree.HTML(html)str1='//dd['for i in range(10):yield{  # yield关键字'index': html.xpath(str1+str(i)+']/i/text()'),'image': html.xpath(str1+str(i)+']/a/img[@class="board-img"]/@data-src'),'title': html.xpath(str1+str(i)+']//p/a[@data-act="boarditem-click"]/text()'),'actor': ''.join(html.xpath(str1+str(i)+']//p[@class="star"]/text()')).strip(),'time': html.xpath(str1+str(i)+']//p[@class="releasetime"]/text()'),'score': ''.join(html.xpath(str1+str(i)+']//p[@class="score"]/i/text()')),}# bs4提取关键信息
def bs4_demo(html):soup = BeautifulSoup(html, 'lxml')# pq=PyQuery(html)# for item in pq('dd img/.board-img')for dd in soup.find_all(name='dd'):yield{'index': dd.find(name='i', attrs={'class': 'board-index'}).string.strip(),#去掉前后空格'image': dd.find(name='img', attrs={'class': 'board-img'})['data-src'],'title': dd.find(name='p', attrs={'class': 'name'}).string.strip(),'actor': dd.find(name='p', attrs={'class': 'star'}).string.strip(),'time': dd.find(name='p', attrs={'class': 'releasetime'}).string.strip(),'score': dd.find(name='i', attrs={'class': 'integer'}).string+dd.find(name='i', attrs={'class': 'fraction'}).string}#pyquery css筛选信息
def pyquery_demo(html):doc=pq(html)for dd in doc('dd').items():yield{'index': dd.find('i.board-index').text(),#获取文本'image': dd.find('img.board-img').attr('data-src'),#获取属性'title': dd.find('p.name a').text(),'actor': dd.find('p.star').text(),'time': dd.find('p.releasetime').text(),'score': dd.find('p.score i.integer').text()+dd.find('p.score i.fraction').text()}def write_to_file(content):with open('/Users/zz/Desktop/result.txt', 'a', encoding='utf-8') as f:# json.dumps()实现字典的序列化，ensure_ascii=False保证输出非Unicode编码f.write(json.dumps(content, ensure_ascii=False)+'/n')def main(offset):url = 'https://maoyan.com/board/4?offset='+str(offset)html = get_one_page(url)# for item in parse_one_page(html):#for item in bs4_demo(html):#for item in pyquery_demo(html):for item in xpath_demo(html):print(item)# write_to_file(item)  # 写入文件if __name__ == '__main__':  # 是否从控制台执行for i in range(10):main(offset=i*10)time.sleep(1)#避免操作过快被识别复制代码