爬取猫眼电影排行

说明：大家可以看崔庆才老师的博客或者买他的书。基本框架来自崔庆才老师的书本。

链接：https://github.com/Python3WebSpider/MaoYan/blob/master/spider.py

基本思路：

拿到网页，解析网页，保存结果，循环操作。

方法：正则表达式、beatifulsoup、pyquery。
我比较喜欢pyquery。

一、正则表达式

这一个也是直接copy崔庆才老师的代码，没做任何修改。

import json
import requests
from requests.exceptions import RequestException
import re
import time


def get_one_page(url):
    try:
        headers = {
            'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36'
        }
        response = requests.get(url, headers=headers)
        if response.status_code == 200:
            return response.text
        return None
    except RequestException:
        return None


def parse_one_page(html):
    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:
        yield {
            'index': item[0],
            'image': item[1],
            'title': item[2],
            'actor': item[3].strip()[3:],
            'time': item[4].strip()[5:],
            'score': item[5] + item[6]
        }


def write_to_file(content):
    with open('result.txt', 'a', encoding='utf-8') as f:
        f.write(json.dumps(content, ensure_ascii=False) + '
')


def main(offset):
    url = 'http://maoyan.com/board/4?offset=' + str(offset)
    html = get_one_page(url)
    for item in parse_one_page(html):
        print(item)
        write_to_file(item)


if __name__ == '__main__':
    for i in range(10):
        main(offset=i * 10)
        time.sleep(1)

二、BeautifulSoup

主要是对解析部分进行了更改。

from bs4 import BeautifulSoup
import json
import requests
from requests.exceptions import RequestException
import re
import time



def get_one_page(url):
    headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.122 Safari/537.36'}
    try:
        response = requests.get(url, headers=headers)
        time.sleep(2)
        if response.status_code == 200:
            return response.text
        else:
            return None
    except RequestException:
        return None


def parse_one_page(html):
    soup = BeautifulSoup(html, 'lxml')  # 使用lxml XML 解析库
    ranking = soup.select('#app > div > div > div.main > dl > dd > i')
    imgsrc = soup.select('#app > div > div > div.main > dl > dd > a > img.board-img')  # 子代选择器
    title = soup.select('#app > div > div > div.main > dl > dd > div > div > div.movie-item-info > p.name > a')
    star = soup.select('#app > div > div > div.main > dl > dd > div > div > div.movie-item-info > p.star')
    releasetime = soup.select('#app > div > div > div.main > dl > dd > div > div > div.movie-item-info > p.releasetime')
    integer = soup.select('#app > div > div > div.main > dl > dd > div > div > div.movie-item-number.score-num > p > i.integer')
    fraction = soup.select('#app > div > div > div.main > dl > dd > div > div > div.movie-item-number.score-num > p > i.fraction')
    for i in range(10):
        yield {
            'index': ranking[i].text,
            'image': imgsrc[i]['data-src'],
            'title': title[i].text,
            'actor': star[i].text.strip()[3:],
            'date': releasetime[i].text.strip()[5:15],
            'score': integer[i].text + fraction[i].text
        }


def write_to_file(items):
    for item in items:
        print(item)
        with open('result.txt', 'a', encoding='utf-8') as f:
            f.write(json.dumps(item, ensure_ascii=False) + '
')


def main(offset):
    url = 'http://maoyan.com/board/4?offset=' + str(offset)
    # print(url)
    html = get_one_page(url)
    # print(html)
    items = parse_one_page(html)
    write_to_file(items)


if __name__ == '__main__':
    for i in range(10):
        main(i*10)
        time.sleep(1)

如何对soup.select中填写,对于影片名：

Copy selector:   #app > div > div > div.main > dl > dd:nth-child(1) > div > div > div.movie-item-info > p.name > a

soup.select:      #app > div > div > div.main > dl > dd > div > div > div.movie-item-info > p.name > a

其他的也类似。对Copy selector中的内容稍加修改，便是填入soup.select中的内容。

 

三、pyquery

也是对解析部分进行了更改。

import json
import requests
from requests.exceptions import RequestException
import time
from pyquery import PyQuery as pq




def get_one_page(url):
    headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.122 Safari/537.36'}
    try:
        response = requests.get(url, headers=headers)
        time.sleep(2)
        if response.status_code == 200:
            return response.text
        else:
            return None
    except RequestException:
        return None


def parse_one_page(page):
    for data in page.items():
        dict = {}
        ranking = data.children('i').text()
        imgsrc = data.find('.board-img').attr('data-src')
        title = data.find('.name').text().strip()
        star = data.find('.star').text().strip()
        releasetime = data.find('.releasetime').text()
        score = data.find('.score').text()
        dict['index'] = ranking
        dict['image'] = imgsrc
        dict['title'] = title
        dict['star']  = star[3:]
        dict['data'] = releasetime[5:15]
        dict['score'] = score
        yield dict


def write_to_file(items):
    for item in items:
        # print(type(item))
        print(item)
        with open('result.txt', 'a', encoding='utf-8') as f:
            f.write(json.dumps(item, ensure_ascii=False) + '
')


def main(offset):
    url = 'http://maoyan.com/board/4?offset=' + str(offset)
    html = get_one_page(url)
    doc = pq(html)
    page = doc.find('dd')
    items = parse_one_page(page)
    write_to_file(items)


if __name__ == '__main__':
    for i in range(10):
        main(i*10)
        time.sleep(1)