{"id":2557,"date":"2025-06-02T17:35:36","date_gmt":"2025-06-04T10:03:35","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=2557"},"modified":"2025-06-04T17:35:36","modified_gmt":"2025-06-04T10:03:35","slug":"python-string-find-rfind","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/python\/python-string-find-rfind\/","title":{"rendered":"Python \u5b57\u4e32\u67e5\u627e\u6280\u5de7\uff1a\u6df1\u5165\u4e86\u89e3 find() \u548c rfind() \u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5"},"content":{"rendered":"<h1>\u4f7f\u7528 Python \u5b57\u4e32\u7684 find() \u548c rfind() \u51fd\u6578\u9032\u884c\u5b50\u5b57\u4e32\u67e5\u627e<\/h1>\n<p>\u5728 Python \u4e2d\uff0c\u6709\u5169\u500b\u975e\u5e38\u5be6\u7528\u7684\u5b57\u4e32\u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u67e5\u627e\u5b50\u5b57\u4e32\uff1a<strong>find()<\/strong> \u548c <strong>rfind()<\/strong>\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u4ecb\u7d39\u9019\u5169\u500b\u51fd\u6578\u7684\u7528\u6cd5\uff0c\u63d0\u4f9b\u5be6\u4f5c\u7bc4\u4f8b\uff0c\u4e26\u5206\u4eab\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\u548c\u932f\u8aa4\u6392\u9664\u7684\u6280\u5de7\uff0c\u5e6b\u52a9\u4f60\u66f4\u6709\u6548\u5730\u4f7f\u7528\u9019\u4e9b\u51fd\u6578\u3002<\/p>\n<h2>1. find() \u51fd\u6578\u7684\u57fa\u672c\u7528\u6cd5<\/h2>\n<p><strong>find()<\/strong> \u51fd\u6578\u6703\u5728\u5b57\u4e32\u4e2d\u67e5\u627e\u7b2c\u4e00\u500b\u51fa\u73fe\u7684\u5b50\u5b57\u4e32\uff0c\u4e26\u8fd4\u56de\u5b83\u7684\u4f4d\u7f6e\u3002\u5982\u679c\u627e\u4e0d\u5230\u5b50\u5b57\u4e32\uff0c\u5247\u8fd4\u56de -1\u3002\u4ee5\u4e0b\u662f <strong>find()<\/strong> \u7684\u57fa\u672c\u4f7f\u7528\u7bc4\u4f8b\uff1a<\/p>\n<pre class=\"brush: python\">\ntext = \"Python is awesome\"\npos = text.find(\"is\")\nprint(pos)  # \u986f\u793a\uff1a7\n<\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c<code>text.find(\"is\")<\/code> \u6703\u5728 <code>text<\/code> \u5b57\u4e32\u4e2d\u67e5\u627e &#8220;is&#8221; \u9019\u500b\u5b50\u5b57\u4e32\uff0c\u4e26\u8fd4\u56de\u5b83\u5728\u5b57\u4e32\u4e2d\u7684\u4f4d\u7f6e\uff0c\u5373 7\u3002<\/p>\n<h2>2. \u6307\u5b9a\u67e5\u627e\u8d77\u59cb\u4f4d\u7f6e<\/h2>\n<p>\u4f60\u4e5f\u53ef\u4ee5\u6307\u5b9a\u4e00\u500b\u8d77\u59cb\u4f4d\u7f6e\uff0c\u5f9e\u8a72\u4f4d\u7f6e\u958b\u59cb\u67e5\u627e\u5b50\u5b57\u4e32\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"brush: python\">\ntext = \"Python is awesome\"\npos = text.find(\"is\", 8)\nprint(pos)  # \u986f\u793a\uff1a-1\n<\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c<code>text.find(\"is\", 8)<\/code> \u6703\u5f9e\u5b57\u4e32\u7684\u7b2c 8 \u500b\u4f4d\u7f6e\u958b\u59cb\u67e5\u627e &#8220;is&#8221; \u9019\u500b\u5b50\u5b57\u4e32\uff0c\u4f46\u7531\u65bc\u5728\u9019\u500b\u4f4d\u7f6e\u4e4b\u5f8c\u6c92\u6709 &#8220;is&#8221; \u9019\u500b\u5b50\u5b57\u4e32\uff0c\u56e0\u6b64\u6703\u8fd4\u56de -1\u3002<\/p>\n<h2>3. rfind() \u51fd\u6578\u7684\u7528\u6cd5<\/h2>\n<p><strong>rfind()<\/strong> \u51fd\u6578\u7684\u529f\u80fd\u8207 <strong>find()<\/strong> \u76f8\u4f3c\uff0c\u4e0d\u540c\u4e4b\u8655\u5728\u65bc\u5b83\u662f\u5f9e\u5b57\u4e32\u7684\u672b\u5c3e\u958b\u59cb\u67e5\u627e\u5b50\u5b57\u4e32\u3002\u4ee5\u4e0b\u662f <strong>rfind()<\/strong> \u7684\u4f7f\u7528\u7bc4\u4f8b\uff1a<\/p>\n<pre class=\"brush: python\">\ntext = \"Python is awesome\"\npos = text.rfind(\"is\")\nprint(pos)  # \u986f\u793a\uff1a7\n<\/pre>\n<p>\u9019\u6bb5\u7a0b\u5f0f\u78bc\u6703\u5f9e\u5b57\u4e32\u7684\u672b\u5c3e\u958b\u59cb\u67e5\u627e &#8220;is&#8221; \u9019\u500b\u5b50\u5b57\u4e32\uff0c\u4e26\u8fd4\u56de\u5b83\u7684\u4f4d\u7f6e\uff0c\u5373 7\u3002<\/p>\n<h2>4. \u932f\u8aa4\u6392\u9664\u548c\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u7576\u4f7f\u7528 <strong>find()<\/strong> \u548c <strong>rfind()<\/strong> \u51fd\u6578\u6642\uff0c\u5efa\u8b70\u4f60\u6aa2\u67e5\u8fd4\u56de\u7684\u503c\uff0c\u4ee5\u78ba\u5b9a\u5b50\u5b57\u4e32\u662f\u5426\u5b58\u5728\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"brush: python\">\nif pos == -1:\n    print(\"\u5b50\u5b57\u4e32\u4e0d\u5b58\u5728\")\nelse:\n    print(\"\u5b50\u5b57\u4e32\u4f4d\u65bc\u7b2c\", pos, \"\u500b\u4f4d\u7f6e\")\n<\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u5e6b\u52a9\u4f60\u5728\u7a0b\u5f0f\u57f7\u884c\u904e\u7a0b\u4e2d\u6355\u6349\u6f5b\u5728\u7684\u932f\u8aa4\uff0c\u5f9e\u800c\u63d0\u9ad8\u7a0b\u5f0f\u7684\u7a69\u5065\u6027\u3002<\/p>\n<h2>5. \u5ef6\u4f38\u61c9\u7528<\/h2>\n<p>\u9664\u4e86\u57fa\u672c\u7684\u67e5\u627e\u529f\u80fd\u5916\uff0c\u4f60\u9084\u53ef\u4ee5\u4f7f\u7528\u9019\u4e9b\u51fd\u6578\u4f86\u9032\u884c\u5b57\u4e32\u7684\u66ff\u63db\u3001\u6aa2\u67e5\u6216\u9032\u884c\u66f4\u8907\u96dc\u7684\u5b57\u4e32\u5206\u6790\u3002\u9019\u4e9b\u6280\u5de7\u5728\u8655\u7406\u6587\u672c\u6578\u64da\u6642\u7279\u5225\u6709\u7528\u3002\u4f8b\u5982\uff0c\u7d50\u5408\u9019\u4e9b\u67e5\u627e\u51fd\u6578\u8207\u5176\u4ed6\u5b57\u4e32\u64cd\u4f5c\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5275\u5efa\u5f37\u5927\u7684\u6587\u672c\u8655\u7406\u5de5\u5177\u3002<\/p>\n<p>\u5982\u679c\u4f60\u60f3\u9032\u4e00\u6b65\u63d0\u5347\u4f60\u7684 Python \u6280\u80fd\uff0c\u5efa\u8b70\u53c3\u8003 [\u9019\u7bc7\u6df1\u5165\u7684 Python \u6559\u5b78\u6587\u7ae0](https:\/\/vocus.cc\/article\/5e9f69b8fd897800012f2a72)\uff0c\u4e86\u89e3\u66f4\u591a\u5b57\u4e32\u64cd\u4f5c\u7684\u6280\u5de7\u3002<\/p>\n<h2>\u7e3d\u7d50<\/h2>\n<p><strong>find()<\/strong> \u51fd\u6578\u53ef\u4ee5\u5728\u5b57\u4e32\u4e2d\u67e5\u627e\u5b50\u5b57\u4e32\uff0c\u4e26\u8fd4\u56de\u5b83\u7684\u4f4d\u7f6e\uff1b<strong>rfind()<\/strong> \u51fd\u6578\u5247\u662f\u5f9e\u5b57\u4e32\u7684\u672b\u5c3e\u958b\u59cb\u67e5\u627e\u5b50\u5b57\u4e32\u3002\u9019\u5169\u500b\u51fd\u6578\u90fd\u975e\u5e38\u5be6\u7528\uff0c\u53ef\u4ee5\u5728\u5beb Python \u7a0b\u5f0f\u6642\u8b93\u4f60\u7684\u5b57\u4e32\u64cd\u4f5c\u66f4\u52a0\u9ad8\u6548\u3002<\/p>\n<h2>\u5e38\u898b\u554f\u984c\u89e3\u7b54 Q&#038;A<\/h2>\n<p><strong>Q1: find() \u548c rfind() \u7684\u4e3b\u8981\u5340\u5225\u662f\u4ec0\u9ebc\uff1f<\/strong><br \/>\nA1: <strong>find()<\/strong> \u5f9e\u5b57\u4e32\u7684\u958b\u59cb\u4f4d\u7f6e\u67e5\u627e\u5b50\u5b57\u4e32\uff0c\u800c <strong>rfind()<\/strong> \u5247\u662f\u5f9e\u5b57\u4e32\u7684\u672b\u5c3e\u958b\u59cb\u67e5\u627e\u3002<\/p>\n<p><strong>Q2: \u5982\u679c\u4f7f\u7528 find() \u627e\u4e0d\u5230\u5b50\u5b57\u4e32\uff0c\u6703\u8fd4\u56de\u4ec0\u9ebc\uff1f<\/strong><br \/>\nA2: \u5982\u679c\u627e\u4e0d\u5230\u5b50\u5b57\u4e32\uff0c<strong>find()<\/strong> \u6703\u8fd4\u56de -1\u3002<\/p>\n<p><strong>Q3: \u53ef\u4ee5\u4f7f\u7528 find() \u67e5\u627e\u591a\u6b21\u51fa\u73fe\u7684\u5b50\u5b57\u4e32\u55ce\uff1f<\/strong><br \/>\nA3: <strong>find()<\/strong> \u53ea\u6703\u8fd4\u56de\u7b2c\u4e00\u6b21\u51fa\u73fe\u7684\u5b50\u5b57\u4e32\u4f4d\u7f6e\uff0c\u82e5\u9700\u8981\u67e5\u627e\u6240\u6709\u51fa\u73fe\u4f4d\u7f6e\uff0c\u53ef\u4ee5\u4f7f\u7528\u8ff4\u5708\u6216\u5176\u4ed6\u5b57\u4e32\u8655\u7406\u6280\u5de7\u3002<\/p>\n<p>&#8212;<\/p>\n<p>\u9019\u6a23\u7684\u5167\u5bb9\u4e0d\u50c5\u66f4\u65b0\u4e86\u904e\u6642\u7684\u8cc7\u8a0a\uff0c\u9084\u589e\u52a0\u4e86\u5be6\u7528\u6027\u548c\u53ef\u8b80\u6027\uff0c\u4e26\u7b26\u5408 SEO \u6700\u4f73\u5be6\u8e10\u3002\u5e0c\u671b\u9019\u7bc7\u6587\u7ae0\u80fd\u5e6b\u52a9\u5230\u4f60\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f7f\u7528 Python \u5b57\u4e32\u7684 find() \u548c rf&#8230;<\/p>\n","protected":false},"author":1,"featured_media":2518,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[18],"tags":[],"class_list":["post-2557","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/badgameshow.com\/steven\/wp-content\/uploads\/2022\/12\/DALL\u00b7E-2022-12-28-14.25.55-\u62f7\u8c9d2.png","jetpack-related-posts":[],"jetpack_shortlink":"https:\/\/wp.me\/pcFK27-Ff","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/2557","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/comments?post=2557"}],"version-history":[{"count":3,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/2557\/revisions"}],"predecessor-version":[{"id":13060,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/2557\/revisions\/13060"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media\/2518"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=2557"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=2557"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=2557"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}