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python采集数据的几种方式

  • 2026-02-26 00:53:40
python采集数据的几种方式

在训练AI模型时,我们常常会遇到,数据获取问题,而大部分训练的数据都是通过互联网采集的,今天我们就分享一下分享几种我用过的有效方法,如何用python去采集数据。

方法一:API优先策略(最推荐)

现在很多网站提供公开API,这是最规范的数据获取方式。

import requestsimport jsonimport time# 1. 查找API# 方法:浏览器开发者工具 -> Network -> XHR# 看请求的URL和参数,很多网站是GET请求带参数的def fetch_from_api(api_url, params=None, headers=None):    """通用API数据获取函数"""    try:        response = requests.get(            api_url,            params=params,            headers=headers or {'User-Agent''AI-Research/1.0'}        )        if response.status_code == 200:            return response.json()        else:            print(f"API请求失败: {response.status_code}")            return None    except Exception as e:        print(f"请求出错: {e}")        return None# 示例:调用GitHub API获取项目信息github_api = "https://api.github.com/search/repositories"params = {    'q''machine learning',    'sort''stars',    'order''desc',    'per_page'10}# data = fetch_from_api(github_api, params)# if data:#     for repo in data['items']:#         print(f"{repo['name']}: {repo['description']}")

合法合规,数据结构规范,稳定性好。

方法二:网站结构化数据爬取

对于没有API但数据格式固定的网站,可以用这种方法。

import requestsfrom bs4 import BeautifulSoupimport pandas as pdfrom urllib.parse import urljoinclass ResearchDataCollector:    """研究用数据采集器"""    def __init__(self, base_url):        self.base_url = base_url        self.session = requests.Session()        self.session.headers.update({            'User-Agent''Mozilla/5.0 (AI-Research-Project/1.0; +http://your-research-site.edu)'        })        self.collected_data = []    def fetch_page(self, url):        """获取单页内容"""        try:            response = self.session.get(url, timeout=10)            response.raise_for_status()            return response.text        except requests.RequestException as e:            print(f"获取页面失败 {url}{e}")            return None    def extract_data(self, html, selectors):        """根据选择器提取数据"""        soup = BeautifulSoup(html, 'html.parser')        data = {}        # 示例:提取学术论文信息        for key, selector in selectors.items():            element = soup.select_one(selector)            if element:                data[key] = element.get_text(strip=True)            else:                data[key] = None        return data    def crawl_pages(self, start_url, max_pages=10):        """爬取多页数据"""        current_url = start_url        page_count = 0        while current_url and page_count < max_pages:            print(f"采集第 {page_count + 1} 页: {current_url}")            html = self.fetch_page(current_url)            if html:                # 提取数据(这里需要根据实际网页结构调整)                data = self.extract_data(html, {                    'title''h1.article-title',                    'authors''.author-list',                    'abstract''.abstract-content',                    'date''.publish-date'                })                if data['title']:  # 确保有实际内容                    self.collected_data.append(data)            # 找下一页链接(实际需要根据网站结构调整)            # 这里只是示例逻辑            page_count += 1            if page_count < max_pages:                current_url = self.get_next_page(html)            time.sleep(2)  # 礼貌性延迟        return self.collected_data    def get_next_page(self, html):        """获取下一页链接"""        soup = BeautifulSoup(html, 'html.parser')        next_link = soup.find('a', text='下一页')        if next_link and 'href' in next_link.attrs:            return urljoin(self.base_url, next_link['href'])        return None    def save_data(self, filename):        """保存采集的数据"""        df = pd.DataFrame(self.collected_data)        df.to_csv(filename, index=False, encoding='utf-8-sig')        print(f"数据已保存到 {filename},共 {len(df)} 条记录")# 使用示例# collector = ResearchDataCollector("https://arxiv.org")# data = collector.crawl_pages("https://arxiv.org/list/cs.AI/recent", max_pages=3)# collector.save_data("ai_papers.csv")

注意
1. 添加明确的User-Agent,说明是研究用途
2. 控制采集频率,避免给对方服务器造成负担
3. 处理异常,确保程序健壮性
4. 最好获取公开的,不要去强行破解对方的服务或者接口

方法三:动态网站数据采集

很多现代网站用JavaScript动态加载数据,需要用Selenium或Playwright。

from selenium import webdriverfrom selenium.webdriver.common.by import Byfrom selenium.webdriver.support.ui import WebDriverWaitfrom selenium.webdriver.support import expected_conditions as ECimport jsonclass DynamicDataCollector:    """动态网站数据采集"""    def __init__(self):        # 使用Headless模式,不显示浏览器窗口        options = webdriver.ChromeOptions()        options.add_argument('--headless')        options.add_argument('--no-sandbox')        options.add_argument('--disable-dev-shm-usage')        # 添加研究用User-Agent        options.add_argument('user-agent=AI-Research-Bot/1.0 (+https://research.example.edu)')        self.driver = webdriver.Chrome(options=options)        self.wait = WebDriverWait(self.driver, 10)    def collect_scroll_data(self, url, scroll_times=5):        """采集需要滚动加载的数据"""        self.driver.get(url)        all_data = []        for i in range(scroll_times):            # 等待内容加载            time.sleep(2)            # 提取当前可见内容            items = self.driver.find_elements(By.CSS_SELECTOR, '.data-item')  # 根据实际调整            for item in items:                try:                    data = {                        'text': item.text,                        'timestamp': item.get_attribute('data-time'),                        # 根据需要添加更多字段                    }                    all_data.append(data)                except:                    continue            # 模拟滚动            self.driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")            print(f"已滚动 {i+1} 次,收集到 {len(all_data)} 条数据")            time.sleep(1)  # 滚动后等待        return all_data    def close(self):        self.driver.quit()# 使用示例# collector = DynamicDataCollector()# tweets = collector.collect_scroll_data("https://twitter.com/search?q=machine%20learning", 3)# collector.close()

方法四:专用数据采集工具

对于大规模数据采集,可以考虑专业的爬虫架构:

  1. Scrapy框架
     - 专业的爬虫框架
import scrapyclass ResearchSpider(scrapy.Spider):    name = 'research_spider'    custom_settings = {        'USER_AGENT''AI-Research-Project/1.0 (+http://research.example.edu)',        'DOWNLOAD_DELAY'2,  # 礼貌延迟        'CONCURRENT_REQUESTS'1,    }    def start_requests(self):        # 起始URL        urls = ['https://example.com/data']        for url in urls:            yield scrapy.Request(url=url, callback=self.parse)    def parse(self, response):        # 解析逻辑        items = response.css('.data-item')        for item in items:            yield {                'title': item.css('h2::text').get(),                'content': item.css('.content::text').get(),                'url': response.url,            }
  1. Apify/ScrapingBee等云服务
     - 省去维护成本
  2. 公开数据集
     - 直接使用现成数据(网上有一些公开的数据集,可以直接拿来训练)
    • Hugging Face Datasets
    • Kaggle Datasets
    • UCI Machine Learning Repository

做AI研究采集数据时,特别要注意:

  1. 尊重网站规则,不要非法获取
  2. 限制采集频率,我通常设置2-5秒的延迟
  3. 遵守使用条款,特别是商业网站
  4. 数据脱敏,移除个人信息
  5. 注明数据来源

数据处理与清洗建议

采集到的数据需要处理才能用:

import pandas as pdimport redef clean_research_data(df):    """清洗研究数据"""    # 1. 去重    df = df.drop_duplicates(subset=['title''content'])    # 2. 处理缺失值    df = df.dropna(subset=['content'])    # 3. 清理文本    df['clean_content'] = df['content'].apply(lambda x: re.sub(r'\s+'' 'str(x)).strip())    # 4. 过滤无效数据    df = df[df['clean_content'].str.len() > 50]  # 至少50个字符    # 5. 标准化格式    if 'date' in df.columns:        df['date'] = pd.to_datetime(df['date'], errors='coerce')    return df# 保存处理后的数据# df_cleaned = clean_research_data(df)# df_cleaned.to_json('cleaned_data.json', orient='records', force_ascii=False)

实战建议

  1. 先采集100-1000条数据测试
  2. 不要只依赖一个网站
  3. 采集过程可能中断,要做备份
  4. 记录采集日志,便于复现和调试
  5. 采集量大要使用代理

反正就是能用API就用API,没有API就礼貌地采集静态数据,动态网站用工具模拟,最后一定要做好数据清洗。

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  1. CONNECT:[ UseTime:0.000892s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001714s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.013713s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004136s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001661s ]
  6. SELECT * FROM `set` [ RunTime:0.001676s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001945s ]
  8. SELECT * FROM `article` WHERE `id` = 477070 LIMIT 1 [ RunTime:0.001237s ]
  9. UPDATE `article` SET `lasttime` = 1772253763 WHERE `id` = 477070 [ RunTime:0.007545s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.002733s ]
  11. SELECT * FROM `article` WHERE `id` < 477070 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000523s ]
  12. SELECT * FROM `article` WHERE `id` > 477070 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004084s ]
  13. SELECT * FROM `article` WHERE `id` < 477070 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.013898s ]
  14. SELECT * FROM `article` WHERE `id` < 477070 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.037663s ]
  15. SELECT * FROM `article` WHERE `id` < 477070 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002150s ]
0.170885s