{"id":959389,"date":"2024-12-27T03:40:12","date_gmt":"2024-12-26T19:40:12","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/959389.html"},"modified":"2024-12-27T03:40:14","modified_gmt":"2024-12-26T19:40:14","slug":"python-if%e8%af%ad%e5%8f%a5%e5%a6%82%e4%bd%95%e7%bb%93%e6%9d%9f","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/959389.html","title":{"rendered":"python if\u8bed\u53e5\u5982\u4f55\u7ed3\u675f"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/25102217\/0f6bdc91-59cc-497e-ac96-f861fc71563c.webp\" alt=\"python if\u8bed\u53e5\u5982\u4f55\u7ed3\u675f\" \/><\/p>\n<p><p> <strong>\u5728Python\u4e2d\uff0cif\u8bed\u53e5\u901a\u8fc7\u7f29\u8fdb\u6765\u5b9a\u4e49\u5176\u8303\u56f4\uff0c\u901a\u5e38\u901a\u8fc7\u5728\u4ee3\u7801\u5757\u7ed3\u675f\u540e\u53d6\u6d88\u7f29\u8fdb\u6765\u7ed3\u675fif\u8bed\u53e5\u3002\u53ef\u4ee5\u4f7f\u7528else\u6216elif\u6765\u8fde\u63a5\u591a\u4e2a\u6761\u4ef6\uff0c\u6216\u8005\u76f4\u63a5\u5728if\u6761\u4ef6\u4e4b\u540e\u6062\u590d\u5230\u6b63\u5e38\u7684\u7f29\u8fdb\u7ea7\u522b\u6765\u7ed3\u675f\u8be5\u6761\u4ef6\u5757\u3002<\/strong>\u5728Python\u4e2d\uff0cif\u8bed\u53e5\u7684\u7ed3\u675f\u65b9\u5f0f\u4e0d\u662f\u901a\u8fc7\u7279\u5b9a\u7684\u7ed3\u675f\u8bed\u53e5\uff0c\u800c\u662f\u901a\u8fc7\u7f29\u8fdb\u6765\u533a\u5206\u4ee3\u7801\u5757\u7684\u8303\u56f4\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecdPython\u4e2dif\u8bed\u53e5\u7684\u4f7f\u7528\u548c\u7ed3\u675f\u65b9\u5f0f\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001IF\u8bed\u53e5\u7684\u57fa\u672c\u7ed3\u6784<\/h3>\n<\/p>\n<p><p>Python\u7684if\u8bed\u53e5\u7528\u4e8e\u6761\u4ef6\u5224\u65ad\uff0c\u5176\u57fa\u672c\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">if condition:<\/p>\n<p>    # \u6267\u884c\u7684\u4ee3\u7801\u5757<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u6b64\u7ed3\u6784\u4e2d\uff0c\u5f53\u6761\u4ef6\u4e3aTrue\u65f6\uff0c\u6267\u884c\u7f29\u8fdb\u540e\u7684\u4ee3\u7801\u5757\u3002\u5982\u679c\u6761\u4ef6\u4e3aFalse\uff0c\u5219\u8df3\u8fc7\u8be5\u4ee3\u7801\u5757\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u4f7f\u7528ELSE\u548cELIF\u8bed\u53e5<\/h3>\n<\/p>\n<ol>\n<li><strong>ELSE\u8bed\u53e5<\/strong><\/li>\n<\/ol>\n<p><p>else\u8bed\u53e5\u7528\u4e8e\u5728if\u6761\u4ef6\u4e0d\u6ee1\u8db3\u65f6\u6267\u884c\u53e6\u4e00\u6bb5\u4ee3\u7801\u3002\u5176\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">if condition:<\/p>\n<p>    # \u5f53\u6761\u4ef6\u4e3aTrue\u65f6\u6267\u884c\u7684\u4ee3\u7801\u5757<\/p>\n<p>else:<\/p>\n<p>    # \u5f53\u6761\u4ef6\u4e3aFalse\u65f6\u6267\u884c\u7684\u4ee3\u7801\u5757<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>else\u8bed\u53e5\u6ca1\u6709\u6761\u4ef6\uff0c\u76f4\u63a5\u8ddf\u5728if\u8bed\u53e5\u7684\u4ee3\u7801\u5757\u4e4b\u540e\u3002\u901a\u8fc7else\u8bed\u53e5\u53ef\u4ee5\u660e\u786e\u5730\u5b9a\u4e49\u5728\u6761\u4ef6\u4e0d\u6ee1\u8db3\u65f6\u5e94\u6267\u884c\u7684\u64cd\u4f5c\u3002<\/p>\n<\/p>\n<ol start=\"2\">\n<li><strong>ELIF\u8bed\u53e5<\/strong><\/li>\n<\/ol>\n<p><p>elif\u8bed\u53e5\u7528\u4e8e\u68c0\u67e5\u591a\u4e2a\u6761\u4ef6\u3002\u5176\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">if condition1:<\/p>\n<p>    # \u5f53condition1\u4e3aTrue\u65f6\u6267\u884c\u7684\u4ee3\u7801\u5757<\/p>\n<p>elif condition2:<\/p>\n<p>    # \u5f53condition2\u4e3aTrue\u65f6\u6267\u884c\u7684\u4ee3\u7801\u5757<\/p>\n<p>else:<\/p>\n<p>    # \u5f53\u4ee5\u4e0a\u6761\u4ef6\u90fd\u4e0d\u6ee1\u8db3\u65f6\u6267\u884c\u7684\u4ee3\u7801\u5757<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4f7f\u7528elif\u8bed\u53e5\u53ef\u4ee5\u5728if\u6761\u4ef6\u4e4b\u5916\uff0c\u68c0\u67e5\u591a\u4e2a\u6761\u4ef6\uff0c\u5e76\u5728\u4efb\u4e00\u6761\u4ef6\u6ee1\u8db3\u65f6\u6267\u884c\u76f8\u5e94\u7684\u4ee3\u7801\u5757\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u4ee3\u7801\u5757\u7684\u7ed3\u675f\u65b9\u5f0f<\/h3>\n<\/p>\n<p><p>\u5728Python\u4e2d\uff0c\u901a\u8fc7\u7f29\u8fdb\u6765\u5b9a\u4e49\u4ee3\u7801\u5757\uff0c\u7f29\u8fdb\u7684\u7ed3\u675f\u5373\u610f\u5473\u7740\u4ee3\u7801\u5757\u7684\u7ed3\u675f\u3002\u7f29\u8fdb\u7684\u51cf\u5c11\u8868\u660e\u5f53\u524d\u4ee3\u7801\u5757\u7684\u7ed3\u675f\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">if condition:<\/p>\n<p>    # \u8fd9\u662fif\u8bed\u53e5\u7684\u4ee3\u7801\u5757<\/p>\n<p>    print(&quot;Condition is true&quot;)<\/p>\n<h2><strong>\u8fd9\u91cc\u4e0d\u7f29\u8fdb\uff0c\u610f\u5473\u7740if\u8bed\u53e5\u7684\u4ee3\u7801\u5757\u5df2\u7ecf\u7ed3\u675f<\/strong><\/h2>\n<p>print(&quot;This is outside the if block&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u56db\u3001\u5e38\u89c1\u9519\u8bef\u548c\u6ce8\u610f\u4e8b\u9879<\/h3>\n<\/p>\n<ol>\n<li><strong>\u7f29\u8fdb\u9519\u8bef<\/strong><\/li>\n<\/ol>\n<p><p>Python\u5bf9\u7f29\u8fdb\u975e\u5e38\u654f\u611f\uff0c\u7f29\u8fdb\u4e0d\u4e00\u81f4\u4f1a\u5bfc\u81f4IndentationError\u3002\u786e\u4fdd\u540c\u4e00\u4ee3\u7801\u5757\u7684\u7f29\u8fdb\u4e00\u81f4\u3002<\/p>\n<\/p>\n<ol start=\"2\">\n<li><strong>\u6ca1\u6709\u4f7f\u7528\u5192\u53f7<\/strong><\/li>\n<\/ol>\n<p><p>\u5728\u6761\u4ef6\u8bed\u53e5\u540e\u5fd8\u8bb0\u4f7f\u7528\u5192\u53f7\u4e5f\u662f\u5e38\u89c1\u9519\u8bef\u3002\u786e\u4fdd\u5728if\u3001elif\u3001else\u6761\u4ef6\u8bed\u53e5\u540e\u52a0\u4e0a\u5192\u53f7\u3002<\/p>\n<\/p>\n<ol start=\"3\">\n<li><strong>\u591a\u4e2a\u6761\u4ef6\u5224\u65ad<\/strong><\/li>\n<\/ol>\n<p><p>\u5728if\u3001elif\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26\uff08and\u3001or\u3001not\uff09\u6765\u7ed3\u5408\u591a\u4e2a\u6761\u4ef6\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">if condition1 and condition2:<\/p>\n<p>    # \u5f53condition1\u548ccondition2\u90fd\u4e3aTrue\u65f6\u6267\u884c\u7684\u4ee3\u7801\u5757<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e94\u3001\u590d\u6742\u903b\u8f91\u7684\u5b9e\u73b0<\/h3>\n<\/p>\n<ol>\n<li><strong>\u5d4c\u5957IF\u8bed\u53e5<\/strong><\/li>\n<\/ol>\n<p><p>\u5f53\u9700\u8981\u5728\u4e00\u4e2aif\u8bed\u53e5\u4e2d\u518d\u8fdb\u884c\u6761\u4ef6\u5224\u65ad\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u5d4c\u5957\u7684if\u8bed\u53e5\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">if condition1:<\/p>\n<p>    # \u5f53condition1\u4e3aTrue\u65f6\u6267\u884c<\/p>\n<p>    if condition2:<\/p>\n<p>        # \u5f53condition1\u548ccondition2\u90fd\u4e3aTrue\u65f6\u6267\u884c<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5d4c\u5957\u7684if\u8bed\u53e5\u53ef\u4ee5\u5904\u7406\u66f4\u590d\u6742\u7684\u903b\u8f91\uff0c\u4f46\u8fc7\u591a\u7684\u5d4c\u5957\u53ef\u80fd\u5bfc\u81f4\u4ee3\u7801\u96be\u4ee5\u9605\u8bfb\u548c\u7ef4\u62a4\u3002<\/p>\n<\/p>\n<ol start=\"2\">\n<li><strong>\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26<\/strong><\/li>\n<\/ol>\n<p><p>\u903b\u8f91\u8fd0\u7b97\u7b26\u53ef\u4ee5\u7b80\u5316\u590d\u6742\u7684\u6761\u4ef6\u5224\u65ad\u3002\u4f8b\u5982\uff0c\u4f7f\u7528and\u3001or\u3001not\u6765\u7ec4\u5408\u591a\u4e2a\u6761\u4ef6\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">if condition1 and (condition2 or condition3):<\/p>\n<p>    # \u5f53condition1\u4e3aTrue\u4e14condition2\u6216condition3\u4e3aTrue\u65f6\u6267\u884c<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u516d\u3001\u5b9e\u8df5\u4e2d\u7684\u5e94\u7528<\/h3>\n<\/p>\n<p><p>\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0cif\u8bed\u53e5\u5e7f\u6cdb\u7528\u4e8e\u6761\u4ef6\u5224\u65ad\uff0c\u5982\uff1a<\/p>\n<\/p>\n<ul>\n<li><strong>\u8868\u5355\u9a8c\u8bc1<\/strong><\/li>\n<\/ul>\n<p><p>\u5728Web\u5f00\u53d1\u4e2d\uff0cif\u8bed\u53e5\u5e38\u7528\u4e8e\u9a8c\u8bc1\u7528\u6237\u63d0\u4ea4\u7684\u8868\u5355\u6570\u636e\u662f\u5426\u5408\u6cd5\u3002<\/p>\n<\/p>\n<ul>\n<li><strong>\u6570\u636e\u5904\u7406<\/strong><\/li>\n<\/ul>\n<p><p>\u5728\u6570\u636e\u5206\u6790\u4e2d\uff0cif\u8bed\u53e5\u7528\u4e8e\u6839\u636e\u6570\u636e\u503c\u7684\u4e0d\u540c\u91c7\u53d6\u4e0d\u540c\u7684\u5904\u7406\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<ul>\n<li><strong>\u63a7\u5236\u7a0b\u5e8f\u6d41\u7a0b<\/strong><\/li>\n<\/ul>\n<p><p>\u5728\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0cif\u8bed\u53e5\u7528\u4e8e\u63a7\u5236\u7a0b\u5e8f\u7684\u6267\u884c\u6d41\u7a0b\uff0c\u51b3\u5b9a\u6267\u884c\u54ea\u4e9b\u529f\u80fd\u6a21\u5757\u3002<\/p>\n<\/p>\n<p><p>\u901a\u8fc7\u7075\u6d3b\u4f7f\u7528if\u3001elif\u3001else\u8bed\u53e5\uff0c\u7ed3\u5408\u903b\u8f91\u8fd0\u7b97\u7b26\uff0c\u53ef\u4ee5\u5b9e\u73b0\u590d\u6742\u7684\u6761\u4ef6\u5224\u65ad\u903b\u8f91\uff0c\u63d0\u9ad8\u7a0b\u5e8f\u7684\u7075\u6d3b\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p> <strong>\u5728Python\u4e2d\uff0c\u5982\u4f55\u6b63\u786e\u4f7f\u7528if\u8bed\u53e5\u6765\u63a7\u5236\u4ee3\u7801\u6d41\uff1f<\/strong><br \/>\u4f7f\u7528if\u8bed\u53e5\u65f6\uff0c\u786e\u4fdd\u6b63\u786e\u7f29\u8fdb\u4ee3\u7801\u5757\uff0c\u4ee5\u4fbfPython\u80fd\u591f\u8bc6\u522b\u6761\u4ef6\u662f\u5426\u6ee1\u8db3\u3002if\u8bed\u53e5\u540e\u9762\u53ef\u4ee5\u8ddf\u4efb\u610f\u6570\u91cf\u7684elif\u548celse\u8bed\u53e5\uff0c\u5f62\u6210\u4e00\u4e2a\u5b8c\u6574\u7684\u6761\u4ef6\u5224\u65ad\u7ed3\u6784\u3002\u4f8b\u5982\uff1a  <\/p>\n<pre><code class=\"language-python\">if condition:\n    # \u4ee3\u7801\u5757\nelif another_condition:\n    # \u4ee3\u7801\u5757\nelse:\n    # \u4ee3\u7801\u5757\n<\/code><\/pre>\n<p>\u5728\u8fd9\u4e9b\u4ee3\u7801\u5757\u4e2d\uff0c\u60a8\u53ef\u4ee5\u653e\u7f6e\u9700\u8981\u5728\u6761\u4ef6\u6ee1\u8db3\u65f6\u6267\u884c\u7684\u4efb\u610f\u64cd\u4f5c\u3002<\/p>\n<p><strong>\u5982\u679c\u6211\u60f3\u5728if\u8bed\u53e5\u4e2d\u4f7f\u7528\u591a\u4e2a\u6761\u4ef6\uff0c\u8be5\u600e\u4e48\u505a\uff1f<\/strong><br \/>\u53ef\u4ee5\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26\uff08\u5982and\u3001or\uff09\u6765\u7ec4\u5408\u591a\u4e2a\u6761\u4ef6\u3002\u4f8b\u5982\uff1a  <\/p>\n<pre><code class=\"language-python\">if condition1 and condition2:\n    # \u4ee3\u7801\u5757\n<\/code><\/pre>\n<p>\u8fd9\u6837\uff0c\u53ea\u6709\u5f53condition1\u548ccondition2\u90fd\u4e3aTrue\u65f6\uff0c\u4ee3\u7801\u5757\u624d\u4f1a\u88ab\u6267\u884c\u3002or\u8fd0\u7b97\u7b26\u5219\u5728\u4efb\u4e00\u6761\u4ef6\u4e3aTrue\u65f6\u6267\u884c\u4ee3\u7801\u5757\u3002<\/p>\n<p><strong>\u5982\u4f55\u8c03\u8bd5if\u8bed\u53e5\u4ee5\u786e\u4fdd\u5b83\u4eec\u6309\u9884\u671f\u5de5\u4f5c\uff1f<\/strong><br \/>\u4f7f\u7528print\u8bed\u53e5\u5728\u6761\u4ef6\u5224\u65ad\u524d\u540e\u6253\u5370\u51fa\u53d8\u91cf\u503c\uff0c\u53ef\u4ee5\u5e2e\u52a9\u60a8\u68c0\u67e5\u903b\u8f91\u662f\u5426\u6b63\u786e\u3002\u901a\u8fc7\u67e5\u770b\u8f93\u51fa\uff0c\u60a8\u53ef\u4ee5\u786e\u8ba4\u6bcf\u4e2a\u6761\u4ef6\u7684\u7ed3\u679c\uff0c\u5e76\u786e\u4fdd\u4ee3\u7801\u6309\u9884\u671f\u6267\u884c\u3002\u6b64\u5916\uff0c\u4f7f\u7528IDE\u4e2d\u7684\u8c03\u8bd5\u5de5\u5177\u4e5f\u662f\u4e00\u79cd\u6709\u6548\u7684\u65b9\u5f0f\uff0c\u80fd\u591f\u9010\u6b65\u6267\u884c\u4ee3\u7801\u5e76\u76d1\u63a7\u53d8\u91cf\u72b6\u6001\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0cif\u8bed\u53e5\u901a\u8fc7\u7f29\u8fdb\u6765\u5b9a\u4e49\u5176\u8303\u56f4\uff0c\u901a\u5e38\u901a\u8fc7\u5728\u4ee3\u7801\u5757\u7ed3\u675f\u540e\u53d6\u6d88\u7f29\u8fdb\u6765\u7ed3\u675fif\u8bed\u53e5\u3002\u53ef\u4ee5\u4f7f\u7528else [&hellip;]","protected":false},"author":3,"featured_media":959396,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/959389"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=959389"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/959389\/revisions"}],"predecessor-version":[{"id":959397,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/959389\/revisions\/959397"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/959396"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=959389"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=959389"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=959389"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}