{"id":1047366,"date":"2024-12-31T13:42:00","date_gmt":"2024-12-31T05:42:00","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1047366.html"},"modified":"2024-12-31T13:42:02","modified_gmt":"2024-12-31T05:42:02","slug":"python%e5%a6%82%e4%bd%95%e7%88%ac%e5%8f%96%e7%bb%9f%e8%ae%a1%e5%b9%b4%e9%89%b4%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1047366.html","title":{"rendered":"python\u5982\u4f55\u722c\u53d6\u7edf\u8ba1\u5e74\u9274\u6570\u636e"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2024\/12\/e518448d-b50e-4085-9fd1-d0fa491de731.webp?x-oss-process=image\/auto-orient,1\/format,webp\" alt=\"python\u5982\u4f55\u722c\u53d6\u7edf\u8ba1\u5e74\u9274\u6570\u636e\" \/><\/p>\n<p><p> <strong>\u4f7f\u7528Python\u722c\u53d6\u7edf\u8ba1\u5e74\u9274\u6570\u636e\u7684\u6b65\u9aa4\u5305\u62ec\uff1a\u9009\u62e9\u5408\u9002\u7684\u722c\u866b\u6846\u67b6\u3001\u8bc6\u522b\u76ee\u6807\u7f51\u7ad9\u7ed3\u6784\u3001\u7f16\u5199\u722c\u866b\u4ee3\u7801\u3001\u5904\u7406\u548c\u5b58\u50a8\u6570\u636e\u3002<\/strong> 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class=\"language-python\">import scrapy<\/p>\n<p>class StatisticsSpider(scrapy.Spider):<\/p>\n<p>    name = &quot;statistics&quot;<\/p>\n<p>    start_urls = [&#39;http:\/\/example.com\/statistics&#39;]<\/p>\n<p>    def parse(self, response):<\/p>\n<p>        for row in response.css(&#39;table tr&#39;):<\/p>\n<p>            yield {<\/p>\n<p>                &#39;year&#39;: row.css(&#39;td.year::text&#39;).get(),<\/p>\n<p>                &#39;value&#39;: row.css(&#39;td.value::text&#39;).get(),<\/p>\n<p>            }<\/p>\n<p>        next_page = response.css(&#39;a.next::attr(href)&#39;).get()<\/p>\n<p>        if next_page is not None:<\/p>\n<p>            yield response.follow(next_page, self.parse)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u4ee3\u7801\u89e3\u91ca\uff1a<\/h4>\n<\/p>\n<ol>\n<li><strong>\u5b9a\u4e49\u722c\u866b\u7c7b<\/strong>\uff1a\u521b\u5efa\u4e00\u4e2a\u7ee7\u627f\u81eascrapy.Spider\u7684\u722c\u866b\u7c7b\uff0c\u5e76\u8bbe\u7f6ename\u548cstart_urls\u5c5e\u6027\u3002<\/li>\n<li><strong>\u7f16\u5199\u89e3\u6790\u51fd\u6570<\/strong>\uff1a\u5728parse\u51fd\u6570\u4e2d\u4f7f\u7528CSS\u9009\u62e9\u5668\u63d0\u53d6\u6570\u636e\uff0c\u5e76\u4f7f\u7528yield\u8bed\u53e5\u8fd4\u56de\u6570\u636e\u3002<\/li>\n<li><strong>\u5904\u7406\u5206\u9875<\/strong>\uff1a\u5728\u89e3\u6790\u51fd\u6570\u4e2d\u68c0\u67e5\u662f\u5426\u5b58\u5728\u4e0b\u4e00\u9875\u94fe\u63a5\uff0c\u5982\u679c\u5b58\u5728\uff0c\u5219\u9012\u5f52\u8c03\u7528parse\u51fd\u6570\u5904\u7406\u4e0b\u4e00\u9875\u3002<\/li>\n<\/ol>\n<p><h3>\u56db\u3001\u5904\u7406\u548c\u5b58\u50a8\u6570\u636e<\/h3>\n<\/p>\n<p><p>\u722c\u53d6\u5230\u7684\u6570\u636e\u9700\u8981\u8fdb\u884c\u5904\u7406\u548c\u5b58\u50a8\u3002Scrapy\u63d0\u4f9b\u4e86\u591a\u79cd\u6570\u636e\u5bfc\u51fa\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5c06\u6570\u636e\u5bfc\u51fa\u4e3aJSON\u3001CSV\u3001XML\u7b49\u683c\u5f0f\u3002<\/p>\n<\/p>\n<p><h4>\u6570\u636e\u5bfc\u51fa\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n<p><p>\u5728Scrapy\u9879\u76ee\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6eFEED_FORMAT\u548cFEED_URI\u6765\u6307\u5b9a\u6570\u636e\u5bfc\u51fa\u683c\u5f0f\u548c\u6587\u4ef6\u8def\u5f84\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\"># settings.py<\/p>\n<p>FEED_FORMAT = &#39;csv&#39;<\/p>\n<p>FEED_URI = &#39;output\/statistics.csv&#39;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u6570\u636e\u5904\u7406\uff1a<\/h4>\n<\/p>\n<p><p>\u5728\u722c\u53d6\u8fc7\u7a0b\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u5bf9\u6570\u636e\u8fdb\u884c\u6e05\u6d17\u548c\u5904\u7406\u3002\u4f8b\u5982\uff0c\u53bb\u9664\u7a7a\u767d\u5b57\u7b26\u3001\u8f6c\u6362\u6570\u636e\u7c7b\u578b\u7b49\u3002\u53ef\u4ee5\u5728\u89e3\u6790\u51fd\u6570\u4e2d\u6dfb\u52a0\u6570\u636e\u5904\u7406\u903b\u8f91\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">def parse(self, response):<\/p>\n<p>    for row in response.css(&#39;table tr&#39;):<\/p>\n<p>        year = row.css(&#39;td.year::text&#39;).get().strip()<\/p>\n<p>        value = float(row.css(&#39;td.value::text&#39;).get().strip())<\/p>\n<p>        yield {<\/p>\n<p>            &#39;year&#39;: year,<\/p>\n<p>            &#39;value&#39;: value,<\/p>\n<p>        }<\/p>\n<p>    next_page = response.css(&#39;a.next::attr(href)&#39;).get()<\/p>\n<p>    if next_page is not None:<\/p>\n<p>        yield response.follow(next_page, self.parse)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e94\u3001\u722c\u866b\u8c03\u8bd5\u548c\u4f18\u5316<\/h3>\n<\/p>\n<p><p>\u722c\u866b\u4ee3\u7801\u7f16\u5199\u5b8c\u6210\u540e\uff0c\u9700\u8981\u8fdb\u884c\u8c03\u8bd5\u548c\u4f18\u5316\uff0c\u4ee5\u786e\u4fdd\u5176\u6b63\u786e\u6027\u548c\u9ad8\u6548\u6027\u3002<\/p>\n<\/p>\n<p><h4>\u8c03\u8bd5\u65b9\u6cd5\uff1a<\/h4>\n<\/p>\n<ol>\n<li><strong>\u4f7f\u7528Scrapy Shell<\/strong>\uff1aScrapy Shell\u662f\u4e00\u4e2a\u4ea4\u4e92\u5f0f\u547d\u4ee4\u884c\u5de5\u5177\uff0c\u53ef\u4ee5\u7528\u4e8e\u8c03\u8bd5\u722c\u866b\u4ee3\u7801\u3002\u901a\u8fc7scrapy shell\u547d\u4ee4\uff0c\u53ef\u4ee5\u5728\u547d\u4ee4\u884c\u4e2d\u6d4b\u8bd5CSS\u9009\u62e9\u5668\u548cXPath\u8868\u8fbe\u5f0f\u3002<\/li>\n<li><strong>\u67e5\u770b\u65e5\u5fd7<\/strong>\uff1aScrapy\u63d0\u4f9b\u4e86\u8be6\u7ec6\u7684\u65e5\u5fd7\u4fe1\u606f\uff0c\u53ef\u4ee5\u901a\u8fc7\u67e5\u770b\u65e5\u5fd7\u6765\u6392\u67e5\u95ee\u9898\u3002<\/li>\n<\/ol>\n<p><h4>\u4f18\u5316\u6280\u5de7\uff1a<\/h4>\n<\/p>\n<ol>\n<li><strong>\u8bbe\u7f6e\u8bf7\u6c42\u5934<\/strong>\uff1a\u6709\u4e9b\u7f51\u7ad9\u4f1a\u68c0\u67e5\u8bf7\u6c42\u5934\uff0c\u4ee5\u5224\u65ad\u662f\u5426\u4e3a\u722c\u866b\u8bf7\u6c42\u3002\u53ef\u4ee5\u5728\u722c\u866b\u4ee3\u7801\u4e2d\u8bbe\u7f6e\u8bf7\u6c42\u5934\uff0c\u6a21\u62df\u6d4f\u89c8\u5668\u8bf7\u6c42\u3002<\/li>\n<li><strong>\u4f7f\u7528\u5ef6\u65f6<\/strong>\uff1a\u4e3a\u4e86\u907f\u514d\u5bf9\u76ee\u6807\u7f51\u7ad9\u9020\u6210\u8fc7\u5927\u538b\u529b\uff0c\u53ef\u4ee5\u5728\u722c\u866b\u4ee3\u7801\u4e2d\u8bbe\u7f6e\u8bf7\u6c42\u5ef6\u65f6\u3002<\/li>\n<li><strong>\u5904\u7406\u53cd\u722c\u63aa\u65bd<\/strong>\uff1a\u6709\u4e9b\u7f51\u7ad9\u4f1a\u4f7f\u7528\u53cd\u722c\u63aa\u65bd\uff0c\u5982\u9a8c\u8bc1\u7801\u3001IP\u5c01\u7981\u7b49\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee3\u7406IP\u3001\u9a8c\u8bc1\u7801\u8bc6\u522b\u7b49\u6280\u672f\u6765\u7ed5\u8fc7\u53cd\u722c\u63aa\u65bd\u3002<\/li>\n<\/ol>\n<p><pre><code class=\"language-python\"># settings.py<\/p>\n<p>USER_AGENT = &#39;Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/91.0.4472.124 Safari\/537.36&#39;<\/p>\n<p>DOWNLOAD_DELAY = 2<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u516d\u3001\u603b\u7ed3<\/h3>\n<\/p>\n<p><p>\u4f7f\u7528Python\u722c\u53d6\u7edf\u8ba1\u5e74\u9274\u6570\u636e\u9700\u8981\u7ecf\u8fc7\u9009\u62e9\u5408\u9002\u7684\u722c\u866b\u6846\u67b6\u3001\u8bc6\u522b\u76ee\u6807\u7f51\u7ad9\u7ed3\u6784\u3001\u7f16\u5199\u722c\u866b\u4ee3\u7801\u3001\u5904\u7406\u548c\u5b58\u50a8\u6570\u636e\u7b49\u6b65\u9aa4\u3002<strong>Scrapy\u662f\u4e00\u4e2a\u9ad8\u6548\u3001\u7075\u6d3b\u7684\u722c\u866b\u6846\u67b6\uff0c\u9002\u5408\u7528\u4e8e\u722c\u53d6\u5927\u578b\u7f51\u7ad9\u548c\u590d\u6742\u7684\u6570\u636e\u7ed3\u6784<\/strong>\u3002\u901a\u8fc7\u5408\u7406\u8bbe\u7f6e\u8bf7\u6c42\u5934\u3001\u4f7f\u7528\u5ef6\u65f6\u7b49\u6280\u5de7\uff0c\u53ef\u4ee5\u63d0\u9ad8\u722c\u866b\u7684\u7a33\u5b9a\u6027\u548c\u6548\u7387\u3002<\/p>\n<\/p>\n<p><p>\u5728\u5b9e\u9645\u64cd\u4f5c\u4e2d\uff0c\u8fd8\u9700\u8981\u6ce8\u610f\u9075\u5b88\u76ee\u6807\u7f51\u7ad9\u7684\u722c\u866b\u534f\u8bae\uff08\u5982robots.txt\uff09\uff0c\u907f\u514d\u5bf9\u7f51\u7ad9\u9020\u6210\u4e0d\u5fc5\u8981\u7684\u538b\u529b\u548c\u5f71\u54cd\u3002\u901a\u8fc7\u4e0d\u65ad\u8c03\u8bd5\u548c\u4f18\u5316\uff0c\u53ef\u4ee5\u5f00\u53d1\u51fa\u9ad8\u6548\u3001\u7a33\u5b9a\u7684\u722c\u866b\u7a0b\u5e8f\uff0c\u6210\u529f\u722c\u53d6\u6240\u9700\u7684\u7edf\u8ba1\u5e74\u9274\u6570\u636e\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p> 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