Python多线程爬取豆瓣影评API接口

下面为您详细讲解如何用Python多线程爬取豆瓣影评API接口：

1. 准备工作

首先，为了爬取豆瓣影评API接口，我们需要先准备以下工作：

• 安装Python3以及requests、beautifulsoup4等必要的Python库；
• 申请豆瓣API接口的访问权限，并拿到访问令牌Token；
• 了解Python的多线程编程原理和实现方法。

2. 编写代码

接下来，我们可以用Python编写多线程爬取豆瓣影评API接口的代码了。具体代码实现过程如下：

2.1. 导入库和设置参数

import requests
import threading
from bs4 import BeautifulSoup

url = 'https://api.douban.com/v2/movie/subject/{subject_id}/reviews?start={start_index}&count={page_size}&apikey={apikey}'
subject_id = 1292052  # 电影《肖申克的救赎》的豆瓣ID
page_size = 20  # 每页数量
start_index = 0  # 起始索引
apikey = '这里填写你的豆瓣API访问令牌'

2.2. 定义方法

def crawl_reviews(start):
    res = requests.get(url.format(subject_id=subject_id, start_index=start, page_size=page_size, apikey=apikey))
    soup = BeautifulSoup(res.text, 'html.parser')
    reviews = soup.find_all('review')
    for review in reviews:
        # 这里可以对每一条影评的元素进行处理
        print(review.contents[1].text)

2.3. 多线程爬取数据

threads = []

for i in range(0, 100, page_size):  # 假设要爬取前 100 条评论
    thread = threading.Thread(target=crawl_reviews, args=(i,))
    threads.append(thread)
    thread.start()

for thread in threads:
    thread.join()

3. 示例说明

以上就是爬取豆瓣影评API接口的完整攻略。接下来，我们给出两个示例说明，帮助大家更好的理解和使用这些代码：

示例1：爬取《肖申克的救赎》影评的标题

def crawl_reviews_title(start):
    res = requests.get(url.format(subject_id=subject_id, start_index=start, page_size=page_size, apikey=apikey))
    soup = BeautifulSoup(res.text, 'html.parser')
    reviews = soup.find_all('review')
    for review in reviews:
        # 爬取影评的标题
        print(review.find('title').text)

threads = []

for i in range(0, 100, page_size):  # 假设要爬取前 100 条评论
    thread = threading.Thread(target=crawl_reviews_title, args=(i,))
    threads.append(thread)
    thread.start()

for thread in threads:
    thread.join()

示例2：爬取电影《霸王别姬》的影评

url = 'https://api.douban.com/v2/movie/subject/{subject_id}/reviews?start={start_index}&count={page_size}&apikey={apikey}'
subject_id = 1291546  # 电影《霸王别姬》的豆瓣ID

threads = []

for i in range(0, 100, page_size):  # 假设要爬取前 100 条评论
    thread = threading.Thread(target=crawl_reviews, args=(i,))
    threads.append(thread)
    thread.start()

for thread in threads:
    thread.join()

以上就是两个简单的示例，供大家参考。希望能对大家理解和使用此文提供帮助。

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