{"id":179999,"date":"2024-05-08T20:26:06","date_gmt":"2024-05-08T12:26:06","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/179999.html"},"modified":"2024-05-08T20:26:17","modified_gmt":"2024-05-08T12:26:17","slug":"python-%e8%b4%9f%e6%95%b0%e5%8f%96%e5%80%bc%e5%90%8e%e4%b8%ba%e4%bd%95%e4%b8%8d%e5%87%ba%e6%95%b0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/179999.html","title":{"rendered":"Python \u8d1f\u6570\u53d6\u503c\u540e\u4e3a\u4f55\u4e0d\u51fa\u6570"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27065017\/5c12be43-694b-44f9-90f1-ceb4ec3d7dfb.webp\" alt=\"Python \u8d1f\u6570\u53d6\u503c\u540e\u4e3a\u4f55\u4e0d\u51fa\u6570\" \/><\/p>\n<p><p><strong>Python\u4e2d\u5bf9\u8d1f\u6570\u53d6\u503c\u540e\u4e0d\u51fa\u73b0\u6570\u7684\u60c5\u51b5\u901a\u5e38\u662f\u56e0\u4e3a\u4ee3\u7801\u8bed\u6cd5\u9519\u8bef\u3001\u903b\u8f91\u9519\u8bef\u6216\u8005\u5bf9Python\u7684\u7d22\u5f15\u89c4\u5219\u7406\u89e3\u4e0d\u5145\u5206\u5bfc\u81f4\u7684\u3002\u5177\u4f53\u800c\u8a00\uff0c\u53ef\u80fd\u6d89\u53ca\u5230\u9519\u8bef\u7684\u7d22\u5f15\u4f7f\u7528\u3001\u5207\u7247\u64cd\u4f5c\u4e0d\u5f53\u3001\u5217\u8868\u6216\u6570\u7ec4\u4e3a\u7a7a\u4ee5\u53ca\u53d8\u91cf\u7c7b\u578b\u4e0d\u6b63\u786e\u7b49\u95ee\u9898<\/strong>\u3002\u4f8b\u5982\uff0c\u5728Python\u4e2d\uff0c\u8d1f\u6570\u7d22\u5f15\u662f\u4ece\u5217\u8868\u7684\u672b\u5c3e\u5f00\u59cb\u8ba1\u6570\uff0c-1 \u8868\u793a\u6700\u540e\u4e00\u4e2a\u5143\u7d20\uff0c-2 \u8868\u793a\u5012\u6570\u7b2c\u4e8c\u4e2a\uff0c\u4f9d\u6b64\u7c7b\u63a8\u3002\u5982\u679c\u7d22\u5f15\u8d85\u51fa\u4e86\u5217\u8868\u7684\u8303\u56f4\uff0c\u5c06\u4f1a\u5bfc\u81f4 <code>IndexError<\/code> \u5f02\u5e38\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u8ba8\u8bba\u4f7f\u7528\u8d1f\u6570\u7d22\u5f15\u65f6\u53ef\u80fd\u9047\u5230\u7684\u95ee\u9898\u5e76\u89e3\u91ca\u5982\u4f55\u6b63\u786e\u5730\u4f7f\u7528\u8d1f\u6570\u7d22\u5f15\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u7406\u89e3\u8d1f\u6570\u7d22\u5f15<\/h3>\n<\/p>\n<p><p><strong>Python\u4e2d\u7684\u8d1f\u6570\u7d22\u5f15\u5141\u8bb8\u4ece\u5217\u8868\u6216\u6570\u7ec4\u7684\u672b\u5c3e\u5f00\u59cb\u8bbf\u95ee\u5143\u7d20<\/strong>\u3002\u8fd9\u79cd\u65b9\u6cd5\u5728\u9700\u8981\u83b7\u53d6\u6700\u540e\u51e0\u4e2a\u5143\u7d20\u800c\u4e0d\u9700\u8981\u77e5\u9053\u5217\u8868\u957f\u5ea6\u7684\u60c5\u51b5\u4e0b\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">my_list = [10, 20, 30, 40, 50]<\/p>\n<p>last_item = my_list[-1]<\/p>\n<p>second_last_item = my_list[-2]<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<code>last_item<\/code> \u7684\u503c\u5c06\u662f 50\uff0c<code>second_last_item<\/code> \u7684\u503c\u5c06\u662f 40\u3002\u8fd9\u8bf4\u660e\u8d1f\u6570\u7d22\u5f15\u662f\u4ece -1 \u5f00\u59cb\u7684\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u8d1f\u6570\u7d22\u5f15\u7684\u6b63\u786e\u4f7f\u7528<\/h3>\n<\/p>\n<p><p>\u5f53\u6b63\u786e\u5730\u4f7f\u7528\u8d1f\u6570\u7d22\u5f15\u65f6\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u4ece\u5217\u8868\u672b\u5c3e\u5f00\u59cb\u8bfb\u53d6\u6570\u636e\u3002\u4e00\u5b9a\u8981\u4fdd\u8bc1\u4f7f\u7528\u7684\u8d1f\u6570\u7d22\u5f15\u503c\u5728\u5217\u8868\u7684\u957f\u5ea6\u8303\u56f4\u5185\uff0c\u5426\u5219\u4f1a\u89e6\u53d1\u9519\u8bef\u3002<\/p>\n<\/p>\n<p><p><strong>\u5982\u679c\u5c1d\u8bd5\u8bbf\u95ee\u7684\u7d22\u5f15\u8d85\u51fa\u4e86\u5217\u8868\u5b58\u5728\u7684\u5143\u7d20\u8303\u56f4\uff0c\u5c31\u4f1a\u51fa\u73b0 <code>IndexError<\/code><\/strong>\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">my_list = [1, 2, 3]<\/p>\n<h2><strong>\u5217\u8868\u53ea\u6709\u4e09\u4e2a\u5143\u7d20\uff0c\u4e0b\u9762\u7684\u8bbf\u95ee\u4f1a\u5f15\u53d1\u9519\u8bef<\/strong><\/h2>\n<p>out_of_range_item = my_list[-4]<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4e0a\u9762\u7684\u4ee3\u7801\u5c06\u4f1a\u629b\u51fa <code>IndexError<\/code> \u56e0\u4e3a <code>-4<\/code> \u8d85\u51fa\u4e86\u5217\u8868\u7684\u8303\u56f4\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u5207\u7247\u64cd\u4f5c\u4e2d\u7684\u8d1f\u6570<\/h3>\n<\/p>\n<p><p>Python\u5141\u8bb8\u5728\u5207\u7247\u64cd\u4f5c\u4e2d\u4f7f\u7528\u8d1f\u6570\uff0c\u8fd9\u662f\u5904\u7406\u5217\u8868\u65f6\u975e\u5e38\u6709\u7528\u7684\u529f\u80fd\u3002\u901a\u8fc7\u5207\u7247\uff0c\u53ef\u4ee5\u83b7\u53d6\u5217\u8868\u7684\u4e00\u4e2a\u5b50\u96c6\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">my_list = [&#039;a&#039;, &#039;b&#039;, &#039;c&#039;, &#039;d&#039;, &#039;e&#039;]<\/p>\n<p>slice_of_list = my_list[-3:-1]<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<code>slice_of_list<\/code> \u7684\u503c\u5c06\u662f <code>[&#039;c&#039;, &#039;d&#039;]<\/code>\u3002\u5207\u7247\u64cd\u4f5c <code>my_list[-3:-1]<\/code> \u83b7\u53d6\u4e86\u4ece\u5012\u6570\u7b2c\u4e09\u4e2a\u5143\u7d20\u5230\u5012\u6570\u7b2c\u4e00\u4e2a\u5143\u7d20\u4e4b\u524d\u7684\u5143\u7d20\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u7a7a\u5217\u8868\u6216\u6570\u7ec4\u7684\u8d1f\u6570\u53d6\u503c<\/h3>\n<\/p>\n<p><p><strong>\u5f53\u5217\u8868\u6216\u6570\u7ec4\u4e3a\u7a7a\u65f6\uff0c\u4efb\u4f55\u6b63\u6570\u6216\u8d1f\u6570\u7684\u7d22\u5f15\u64cd\u4f5c\u90fd\u5c06\u5bfc\u81f4 <code>IndexError<\/code><\/strong>\u3002\u5728\u8fdb\u884c\u8d1f\u6570\u53d6\u503c\u4e4b\u524d\uff0c\u786e\u4fdd\u5217\u8868\u6216\u6570\u7ec4\u4e2d\u6709\u5143\u7d20\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">empty_list = []<\/p>\n<h2><strong>\u5bf9\u7a7a\u5217\u8868\u8fdb\u884c\u7d22\u5f15\u8bbf\u95ee\u5c06\u4f1a\u5f15\u53d1\u9519\u8bef<\/strong><\/h2>\n<p>try:<\/p>\n<p>    non_existent = empty_list[-1]<\/p>\n<p>except IndexError:<\/p>\n<p>    print(&quot;Cannot access elements in an empty list.&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u8fd9\u4e2a\u4ee3\u7801\u7247\u6bb5\u4e2d\uff0c\u5c1d\u8bd5\u8bbf\u95ee\u7a7a\u5217\u8868\u7684\u5143\u7d20\u4f1a\u629b\u51fa\u9519\u8bef\uff0c\u5e76\u5728\u6355\u83b7\u5f02\u5e38\u540e\u6253\u5370\u51fa\u76f8\u5e94\u7684\u4fe1\u606f\u3002<\/p>\n<\/p>\n<p><h3>\u4e94\u3001\u53d8\u91cf\u7c7b\u578b\u9519\u8bef\u7684\u60c5\u51b5<\/h3>\n<\/p>\n<p><p>\u5982\u679c\u5c1d\u8bd5\u5728\u975e\u5217\u8868\u6216\u6570\u7ec4\u7c7b\u578b\u7684\u53d8\u91cf\u4e0a\u4f7f\u7528\u8d1f\u6570\u7d22\u5f15\uff0c\u5c06\u4f1a\u5f15\u53d1 <code>TypeError<\/code>\u3002\u786e\u4fdd\u5728\u4f7f\u7528\u8d1f\u6570\u7d22\u5f15\u65f6\u5bf9\u8c61\u7c7b\u578b\u6b63\u786e\u4e5f\u662f\u907f\u514d\u9519\u8bef\u7684\u5173\u952e\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\"># \u5047\u8bbe\u53d8\u91cf\u4e0d\u662f\u5217\u8868\uff0c\u800c\u662f\u4e00\u4e2a\u6574\u6570\u6216\u5176\u4ed6\u7c7b\u578b<\/p>\n<p>not_a_list = 123<\/p>\n<h2><strong>\u8bd5\u56fe\u5728\u975e\u5217\u8868\u5bf9\u8c61\u4e0a\u4f7f\u7528\u7d22\u5f15\u8bbf\u95ee\u5c06\u4f1a\u5f15\u53d1TypeError<\/strong><\/h2>\n<p>try:<\/p>\n<p>    result = not_a_list[-1]<\/p>\n<p>except TypeError:<\/p>\n<p>    print(&quot;Invalid operation on a non-list type.&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u516d\u3001\u89e3\u51b3\u65b9\u6cd5\u548c\u6700\u4f73\u5b9e\u8df5<\/h3>\n<\/p>\n<p><p>\u8981\u89e3\u51b3\u4f7f\u7528\u8d1f\u6570\u7d22\u5f15\u65f6\u7684\u9519\u8bef\uff0c\u91cd\u8981\u7684\u662f<strong>\u9075\u5faa\u6b63\u786e\u7684\u8bed\u6cd5\u3001\u786e\u4fdd\u7d22\u5f15\u5728\u6b63\u786e\u7684\u8303\u56f4\u5185\u4ee5\u53ca\u53d8\u91cf\u7c7b\u578b\u6b63\u786e<\/strong>\u3002\u540c\u65f6\uff0c\u5728\u7f16\u5199\u4ee3\u7801\u65f6\u8fdb\u884c\u9002\u5f53\u7684\u9519\u8bef\u5904\u7406\u548c\u8fb9\u754c\u68c0\u67e5\u4e5f\u80fd\u6709\u6548\u907f\u514d\u8fd9\u7c7b\u95ee\u9898\u3002<\/p>\n<\/p>\n<p><p>\u5728\u5f00\u53d1Python\u9879\u76ee\u65f6\uff0c\u8981\u517b\u6210\u826f\u597d\u7684\u7f16\u7a0b\u4e60\u60ef\uff0c\u5305\u62ec\u5bf9\u8fb9\u754c\u60c5\u51b5\u8fdb\u884c\u6d4b\u8bd5\u3001\u5229\u7528\u5f02\u5e38\u5904\u7406\u4ee5\u53ca\u7f16\u5199\u6e05\u6670\u6613\u61c2\u7684\u4ee3\u7801\u3002\u8fd9\u4e0d\u4ec5\u53ef\u4ee5\u51cf\u5c11\u9519\u8bef\u7684\u53d1\u751f\uff0c\u8fd8\u80fd\u4f7f\u4ee3\u7801\u7684\u7ef4\u62a4\u548c\u540e\u671f\u6269\u5c55\u53d8\u5f97\u66f4\u52a0\u5bb9\u6613\u3002<\/p>\n<\/p>\n<p><p>\u5728\u7ed3\u675f\u65f6\uff0c\u5982\u679c\u786e\u4fdd\u4f60\u5bf9\u5217\u8868\u7684\u957f\u5ea6\u548c\u5185\u5bb9\u6709\u5145\u5206\u7684\u4e86\u89e3\uff0c\u5e76\u4e14\u9075\u7167Python\u7684\u8d1f\u6570\u7d22\u5f15\u89c4\u5219\u7cbe\u786e\u5730\u4f7f\u7528\u5b83\u4eec\uff0c\u4f60\u5c31\u53ef\u5229\u7528\u8d1f\u6570\u7d22\u5f15\u8fd9\u4e00\u5f3a\u5927\u7684\u7279\u6027\u6765\u7f16\u5199\u66f4\u52a0\u9ad8\u6548\u548c\u7b80\u6d01\u7684\u4ee3\u7801\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>\u4e3a\u4ec0\u4e48Python\u4e2d\u8d1f\u6570\u53d6\u503c\u4e0d\u663e\u793a\u7ed3\u679c\uff1f<\/strong><\/p>\n<p>Python\u4e2d\u8ba1\u7b97\u673a\u5185\u90e8\u5904\u7406\u8d1f\u6570\u548c\u6b63\u6570\u6709\u6240\u4e0d\u540c\u3002\u8d1f\u6570\u5728\u8ba1\u7b97\u673a\u4e2d\u4ee5\u4e00\u79cd\u7279\u5b9a\u7684\u65b9\u5f0f\u8868\u793a\uff0c\u5373\u4f7f\u7528\u4e8c\u8fdb\u5236\u8865\u7801\u8868\u793a\u6cd5\u3002\u8fd9\u79cd\u8868\u793a\u6cd5\u4e2d\uff0c\u6700\u9ad8\u4f4d\u662f\u7b26\u53f7\u4f4d\uff0c0\u8868\u793a\u6b63\u6570\uff0c1\u8868\u793a\u8d1f\u6570\u3002\u5f53\u6211\u4eec\u5728Python\u4e2d\u53d6\u8d1f\u6570\u7684\u503c\u65f6\uff0c\u8ba1\u7b97\u673a\u5c06\u9996\u5148\u8ba1\u7b97\u5176\u5bf9\u5e94\u7684\u6b63\u6570\u7684\u8865\u7801\uff0c\u7136\u540e\u518d\u8fdb\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002<\/p>\n<p><strong>\u4e3a\u4ec0\u4e48\u8d1f\u6570\u53d6\u503c\u540e\u4e0d\u4f1a\u51fa\u73b0\u5c0f\u6570\u90e8\u5206\uff1f<\/strong><\/p>\n<p>Python\u4e2d\u7684\u6574\u6570\u9664\u6cd5\u4f1a\u8fdb\u884c &quot;\u5730\u677f\u9664&quot; 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