如何使用Python通过API接口批量抓取小红书笔记评论？

一、技术可行性分析

1. API存在性验证

   • 小红书官方未公开评论API，需通过逆向工程获取接口
   • 典型评论接口特征：参考小红书开放平台API接口

2. 请求参数解析

   python
   # 典型请求参数示例
   params = {
       "note_id": "64a1b2c3d4e5f6g7h8i9j0k1",  # 笔记ID
       "sort": "newest",                       # 排序方式
       "page": 1,                              # 页码
       "page_size": 20                         # 每页数量
   }

二、完整技术实现方案

python
import requests
import json
import time
from urllib.parse import urlencode
 
class XiaohongshuCommentScraper:
    def __init__(self):
        self.session = requests.Session()
        self.headers = {
            "User-Agent": "Mozilla/5.0 (iPhone; CPU iPhone OS 16_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148",
            "X-Request-ID": "api.comment_list",
            "Content-Type": "application/json"
        }
        self.base_url = "https://www.xiaohongshu.com/api/sns/note/v1/comment_list"
 
    def get_comments(self, note_id, max_pages=5):
        comments = []
        for page in range(1, max_pages+1):
            params = {
                "note_id": note_id,
                "sort": "newest",
                "page": page,
                "page_size": 20
            }
            
            try:
                response = self.session.get(
                    self.base_url, 
                    headers=self.headers,
                    params=urlencode(params)
                )
                data = response.json()
                
                if data.get('errcode') != 0:
                    raise Exception(f"API Error: {data.get('errmsg')}")
                
                page_comments = data.get('data', {}).get('comments', [])
                if not page_comments:
                    break
                    
                comments.extend([{
                    "id": c["id"],
                    "user": c["user"]["nickname"],
                    "content": c["content"],
                    "like_count": c["like_count"],
                    "create_time": c["create_time"]
                } for c in page_comments])
                
                time.sleep(1.5)  # 反爬延迟
                
            except Exception as e:
                print(f"Error on page {page}: {str(e)}")
                break
                
        return comments
 
if __name__ == "__main__":
    scraper = XiaohongshuCommentScraper()
    note_id = "64a1b2c3d4e5f6g7h8i9j0k1"  # 替换为实际笔记ID
    
    comments = scraper.get_comments(note_id, max_pages=3)
    print(f"成功抓取 {len(comments)} 条评论")
    
    # 保存为CSV文件
    with open("comments.csv", "w", encoding="utf-8") as f:
        f.write("ID,用户,内容,点赞数,创建时间\n")
        for c in comments:
            f.write(f"{c['id']},{c['user']},{c['content']},{c['like_count']},{c['create_time']}\n")

三、进阶优化方案

1. 分布式爬取架构

   python
   from concurrent.futures import ThreadPoolExecutor
    
   def distributed_scraping(note_ids):
       with ThreadPoolExecutor(max_workers=5) as executor:
           futures = [executor.submit(scraper.get_comments, nid, 2) for nid in note_ids]
           results = [f.result() for f in futures]
       return results

2. 反爬对抗策略

   python
   class AntiCrawler:
       @staticmethod
       def get_proxy():
           # 返回可用代理IP
           return {"http": "123.45.67.89:8080"}
       
       @staticmethod
       def random_delay():
           time.sleep(random.uniform(1, 3))

四、数据存储扩展

python
import sqlite3
 
class DataStorage:
    def __init__(self):
        self.conn = sqlite3.connect("comments.db")
        self._create_table()
        
    def _create_table(self):
        cursor = self.conn.cursor()
        cursor.execute('''
            CREATE TABLE IF NOT EXISTS comments (
                id TEXT PRIMARY KEY,
                note_id TEXT,
                user TEXT,
                content TEXT,
                like_count INTEGER,
                create_time INTEGER
            )
        ''')
        self.conn.commit()
        
    def save_comments(self, comments, note_id):
        cursor = self.conn.cursor()
        for c in comments:
            cursor.execute('''
                INSERT OR REPLACE INTO comments 
                VALUES (?, ?, ?, ?, ?, ?)
            ''', (c["id"], note_id, c["user"], c["content"], c["like_count"], c["create_time"]))
        self.conn.commit()

五、法律与道德规范

1. 遵守《网络安全法》和《数据安全法》
2. 禁止抓取用户隐私信息（手机号、地址等）
3. 控制请求频率（建议QPS≤2）
4. 明确标注数据来源，禁止商业用途

该方案通过模拟移动端请求实现评论抓取，采用分页机制和动态延迟策略规避反爬限制。实际部署时建议配合代理IP池和异常重试机制，确保数据采集的稳定性和合规性。