{"id":178925,"date":"2024-05-08T20:02:10","date_gmt":"2024-05-08T12:02:10","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/178925.html"},"modified":"2024-05-08T20:02:47","modified_gmt":"2024-05-08T12:02:47","slug":"python-%e4%b8%adprintalena-1%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d%e5%91%80-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/178925.html","title":{"rendered":"python \u4e2dprint(a[len(a)-1])\u662f\u4ec0\u4e48\u610f\u601d\u5440"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27063600\/d900c50b-f985-4248-bbbd-7e92ae3ee30b.webp\" alt=\"python \u4e2dprint(a[len(a)-1])\u662f\u4ec0\u4e48\u610f\u601d\u5440\" \/><\/p>\n<p><p>\u5728Python\u4e2d\uff0c\u8868\u8fbe\u5f0f<code>print(a[len(a)-1])<\/code>\u7528\u4e8e\u6253\u5370\u5e8f\u5217<code>a<\/code>\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u3002\u8fd9\u91cc\u7684\u903b\u8f91\u57fa\u4e8ePython\u7684\u7d22\u5f15\u673a\u5236\uff0c\u5176\u4e2d<code>len(a)<\/code>\u8ba1\u7b97<code>a<\/code>\u7684\u957f\u5ea6\uff0c\u51cf\u53bb<code>1<\/code>\u5f97\u5230\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u7684\u7d22\u5f15\u503c\uff0c\u56e0\u4e3aPython\u7684\u7d22\u5f15\u4ece<code>0<\/code>\u5f00\u59cb\u3002<strong>\u6838\u5fc3\u89c2\u70b9\uff1a\u6253\u5370\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u3001\u57fa\u4e8ePython\u7d22\u5f15\u673a\u5236\u3001\u9002\u7528\u4e8e\u4efb\u4f55\u5e8f\u5217\u7c7b\u578b\uff0c\u5982\u5217\u8868\u6216\u5b57\u7b26\u4e32\u3002<\/strong> \u5bf9\u4e8e\u201c\u57fa\u4e8ePython\u7d22\u5f15\u673a\u5236\u201d\u8fd9\u4e00\u70b9\uff0c\u503c\u5f97\u5c55\u5f00\u8bf4\u660e\u7684\u662f\uff0cPython\u652f\u6301\u8d1f\u7d22\u5f15\uff0c\u5176\u4e2d<code>-1<\/code>\u8868\u793a\u5e8f\u5217\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u3002\u56e0\u6b64\uff0c<code>a[-1]<\/code>\u662f\u4e00\u4e2a\u66f4\u76f4\u89c2\u3001\u66f4Pythonic\u7684\u65b9\u5f0f\u6765\u8bbf\u95ee\u5e8f\u5217\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\uff0c\u65e0\u9700\u660e\u786e\u8ba1\u7b97\u957f\u5ea6\u3002\u8fd9\u4e00\u70b9\u51f8\u663e\u4e86Python\u8bbe\u8ba1\u7684\u4f18\u96c5\u548c\u5bf9\u5f00\u53d1\u8005\u53cb\u597d\u7684\u7279\u70b9\u3002<\/p>\n<\/p>\n<p><h2>\u4e00\u3001PYTHON\u7d22\u5f15\u548c\u5207\u7247\u57fa\u7840<\/h2>\n<\/p>\n<p><p>\u6bcf\u4e2a\u5728Python\u4e2d\u521b\u5efa\u7684\u5e8f\u5217\uff0c\u4e0d\u8bba\u662f\u5217\u8868(<code>list<\/code>)\u3001\u5b57\u7b26\u4e32(<code>str<\/code>)\u3001\u5143\u7ec4(<code>tuple<\/code>)\u7b49\uff0c\u90fd\u652f\u6301\u7d22\u5f15\u548c\u5207\u7247\u64cd\u4f5c\u3002\u901a\u8fc7\u7d22\u5f15\uff0c\u6211\u4eec\u53ef\u4ee5\u8bbf\u95ee\u5e8f\u5217\u4e2d\u7684\u5355\u4e2a\u5143\u7d20\u6216\u901a\u8fc7\u5207\u7247\u64cd\u4f5c\u8bbf\u95ee\u5b50\u5e8f\u5217\u3002<\/p>\n<\/p>\n<p><h3>\u7d22\u5f15<\/h3>\n<\/p>\n<p><p>\u5728Python\u4e2d\uff0c\u7d22\u5f15\u5141\u8bb8\u6211\u4eec\u8bbf\u95ee\u5e8f\u5217\u4e2d\u7684\u7279\u5b9a\u5143\u7d20\u3002\u6b63\u7d22\u5f15\u4ece<code>0<\/code>\u5f00\u59cb\u76f4\u5230<code>len(a)-1<\/code>\uff0c\u800c\u8d1f\u7d22\u5f15\u4ece<code>-1<\/code>\u5f00\u59cb\uff0c\u8868\u793a\u5012\u6570\u7b2c\u4e00\u4e2a\u5143\u7d20\uff0c\u76f4\u5230<code>-len(a)<\/code>\uff0c\u8868\u793a\u7b2c\u4e00\u4e2a\u5143\u7d20\u3002 <\/p>\n<\/p>\n<p><p>\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u6709\u4e00\u4e2a\u5217\u8868<code>a = [10, 20, 30, 40, 50]<\/code>\uff0c<code>a[0]<\/code>\u5c06\u8bbf\u95ee\u7b2c\u4e00\u4e2a\u5143\u7d20\uff0810\uff09\uff0c\u800c<code>a[-1]<\/code>\u5c06\u8bbf\u95ee\u6700\u540e\u4e00\u4e2a\u5143\u7d20\uff0850\uff09\uff0c\u8fd9\u5c55\u73b0\u4e86Python\u5904\u7406\u5e8f\u5217\u7684\u7075\u6d3b\u6027\u3002<\/p>\n<\/p>\n<p><h3>\u5207\u7247<\/h3>\n<\/p>\n<p><p>\u5207\u7247\u64cd\u4f5c\u5141\u8bb8\u6211\u4eec\u83b7\u53d6\u5e8f\u5217\u7684\u4e00\u90e8\u5206\u3002\u5176\u8bed\u6cd5\u4e3a<code>a[start:end:step]<\/code>\uff0c\u5176\u4e2d<code>start<\/code>\u662f\u5207\u7247\u5f00\u59cb\u7684\u4f4d\u7f6e\u7d22\u5f15\uff0c<code>end<\/code>\u662f\u5207\u7247\u7ed3\u675f\u7684\u4f4d\u7f6e\u7d22\u5f15\u4f46\u4e0d\u5305\u62ec\u5b83\uff0c\u800c<code>step<\/code>\u662f\u6b65\u957f\uff0c\u9ed8\u8ba4\u4e3a<code>1<\/code>\u3002<\/p>\n<\/p>\n<p><p>\u4f7f\u7528\u5207\u7247\uff0c\u6211\u4eec\u53ef\u4ee5\u65b9\u4fbf\u5730\u83b7\u53d6\u5e8f\u5217\u7684\u5b50\u96c6\uff0c\u5982<code>a[1:3]<\/code>\u5c06\u8fd4\u56de\u5217\u8868a\u4e2d\u7684\u7b2c\u4e8c\u548c\u7b2c\u4e09\u4e2a\u5143\u7d20\u7684\u5217\u8868<code>[20, 30]<\/code>\u3002<\/p>\n<\/p>\n<p><h2>\u4e8c\u3001PYTHON\u5e8f\u5217\u7c7b\u578b\u6982\u8ff0<\/h2>\n<\/p>\n<p><p>Python\u63d0\u4f9b\u4e86\u591a\u79cd\u5185\u5efa\u7684\u5e8f\u5217\u7c7b\u578b\uff0c\u5982\u5217\u8868\u3001\u5b57\u7b26\u4e32\u548c\u5143\u7ec4\uff0c\u6bcf\u79cd\u7c7b\u578b\u90fd\u652f\u6301\u4e0a\u8ff0\u7684\u7d22\u5f15\u548c\u5207\u7247\u64cd\u4f5c\uff0c\u4f46\u5b83\u4eec\u5728\u5176\u4ed6\u65b9\u9762\u6709\u6240\u4e0d\u540c\u3002<\/p>\n<\/p>\n<p><h3>\u5217\u8868<\/h3>\n<\/p>\n<p><p>\u5217\u8868\u662f\u4e00\u79cd\u53ef\u53d8\u7684\u5e8f\u5217\u7c7b\u578b\uff0c\u652f\u6301\u589e\u52a0\u3001\u5220\u9664\u6216\u4fee\u6539\u5176\u4e2d\u7684\u5143\u7d20\u3002\u8fd9\u4f7f\u5f97\u5217\u8868\u6210\u4e3a\u975e\u5e38\u7075\u6d3b\u7684\u6570\u636e\u7ed3\u6784\uff0c\u9002\u5408\u8868\u793a\u9700\u8981\u9891\u7e41\u4fee\u6539\u7684\u6570\u636e\u96c6\u5408\u3002<\/p>\n<\/p>\n<p><h3>\u5b57\u7b26\u4e32<\/h3>\n<\/p>\n<p><p>\u5b57\u7b26\u4e32\u662f\u4e0d\u53ef\u53d8\u7684\u5e8f\u5217\u7c7b\u578b\uff0c\u5b58\u50a8\u5b57\u7b26\u5e8f\u5217\u3002\u5c3d\u7ba1\u5b57\u7b26\u4e32\u4e0d\u652f\u6301\u76f4\u63a5\u4fee\u6539\u5176\u4e2d\u7684\u5143\u7d20\uff0c\u4f46\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u65b9\u6cd5\u6765\u521b\u5efa\u548c\u5904\u7406\u6587\u672c\u6570\u636e\u3002<\/p>\n<\/p>\n<p><h3>\u5143\u7ec4<\/h3>\n<\/p>\n<p><p>\u5143\u7ec4\u4e0e\u5217\u8868\u7c7b\u4f3c\uff0c\u4f46\u662f\u4e00\u65e6\u521b\u5efa\u4fbf\u4e0d\u80fd\u4fee\u6539\uff0c\u5373\u5b83\u662f\u4e0d\u53ef\u53d8\u7684\u3002\u5143\u7ec4\u7684\u4e0d\u53ef\u53d8\u6027\u4f7f\u5176\u6210\u4e3a\u5b58\u50a8\u4e0d\u5e94\u8be5\u6539\u53d8\u7684\u6570\u636e\u7684\u7406\u60f3\u9009\u62e9\u3002<\/p>\n<\/p>\n<p><h2>\u4e09\u3001PYTHON\u4e2d\u4f7f\u7528\u7d22\u5f15\u548c\u5207\u7247\u7684\u5b9e\u8df5\u6280\u5de7<\/h2>\n<\/p>\n<p><p>\u638c\u63e1\u4e86\u57fa\u7840\u4e4b\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u63a2\u7d22\u4f7f\u7528\u7d22\u5f15\u548c\u5207\u7247\u7684\u66f4\u591a\u9ad8\u7ea7\u6280\u5de7\u3002<\/p>\n<\/p>\n<p><h3>\u4f7f\u7528\u8d1f\u7d22\u5f15<\/h3>\n<\/p>\n<p><p>\u5229\u7528\u8d1f\u7d22\u5f15\u53ef\u4ee5\u8ba9\u4ee3\u7801\u66f4\u7b80\u6d01\u4e14\u6613\u8bfb\uff0c\u5c24\u5176\u5728\u9700\u8981\u8bbf\u95ee\u5e8f\u5217\u672b\u5c3e\u5143\u7d20\u65f6\u3002\u6bd4\u5982\uff0c<code>a[-1]<\/code>\u6bd4<code>a[len(a)-1]<\/code>\u66f4\u7b80\u6d01\uff0c\u76f4\u89c2\u5730\u8868\u793a\u4e86\u6211\u4eec\u7684\u610f\u56fe\u3002<\/p>\n<\/p>\n<p><h3>\u5207\u7247\u7528\u4e8e\u521b\u5efa\u526f\u672c<\/h3>\n<\/p>\n<p><p>\u4f7f\u7528\u5207\u7247\u64cd\u4f5c\uff0c\u53ef\u4ee5\u8f7b\u677e\u521b\u5efa\u5e8f\u5217\u7684\u526f\u672c\u3002\u4f8b\u5982\uff0c<code>a[:]<\/code>\u751f\u6210\u5217\u8868a\u7684\u4e00\u4e2a\u6d45\u526f\u672c\uff0c\u8fd9\u5728\u9700\u8981\u5bf9\u539f\u59cb\u6570\u636e\u8fdb\u884c\u64cd\u4f5c\u800c\u4e0d\u5f71\u54cd\u539f\u6570\u636e\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n<p><h2>\u56db\u3001\u9ad8\u6548\u4f7f\u7528PYTHON\u7d22\u5f15\u548c\u5207\u7247\u7684\u5efa\u8bae<\/h2>\n<\/p>\n<p><p>\u867d\u7136\u7d22\u5f15\u548c\u5207\u7247\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u80fd\u529b\u6765\u5904\u7406\u5e8f\u5217\u6570\u636e\uff0c\u4f46\u662f\u6211\u4eec\u5728\u4f7f\u7528\u65f6\u8fd8\u5e94\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\u4ee5\u4fdd\u8bc1\u4ee3\u7801\u7684\u6548\u7387\u548c\u53ef\u8bfb\u6027\u3002<\/p>\n<\/p>\n<p><h3>\u907f\u514d\u8fc7\u5ea6\u4f7f\u7528\u7d22\u5f15<\/h3>\n<\/p>\n<p><p>\u867d\u7136\u76f4\u63a5\u901a\u8fc7\u7d22\u5f15\u8bbf\u95ee\u5143\u7d20\u5f88\u65b9\u4fbf\uff0c\u4f46\u662f\u5728\u5904\u7406\u590d\u6742\u6570\u636e\u7ed3\u6784\u65f6\uff0c\u5e94\u5c3d\u91cf\u4f7f\u7528Python\u7684\u9ad8\u7ea7\u62bd\u8c61\uff0c\u5982\u5217\u8868\u63a8\u5bfc\u5f0f\u3001\u751f\u6210\u5668\u8868\u8fbe\u5f0f\u7b49\uff0c\u8fd9\u4e9b\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u548cPythonic\u3002<\/p>\n<\/p>\n<p><h3>\u6709\u6548\u5229\u7528\u5207\u7247\u64cd\u4f5c<\/h3>\n<\/p>\n<p><p>\u5207\u7247\u4e0d\u4ec5\u53ef\u4ee5\u7528\u4e8e\u8bbf\u95ee\u6570\u636e\u7684\u5b50\u96c6\uff0c\u8fd8\u53ef\u4ee5\u7528\u4e8e\u4fee\u6539\u5217\u8868\u7684\u5185\u5bb9\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5207\u7247\u6765\u5b9e\u73b0\u5217\u8868\u7684\u63d2\u5165\u3001\u5220\u9664\u7b49\u64cd\u4f5c\uff0c\u8fd9\u6bd4\u4f7f\u7528\u76f8\u5173\u7684\u65b9\u6cd5\u66f4\u76f4\u63a5\u4e14\u6548\u7387\u66f4\u9ad8\u3002<\/p>\n<\/p>\n<p><p>\u901a\u8fc7\u6df1\u5165\u7406\u89e3\u5e76\u5b9e\u8df5\u4e0a\u8ff0\u5404\u70b9\uff0c\u4f60\u5c06\u80fd\u591f\u66f4\u52a0\u7075\u6d3b\u548c\u9ad8\u6548\u5730\u5229\u7528Python\u7684\u7d22\u5f15\u548c\u5207\u7247\u7279\u6027\u6765\u5904\u7406\u5404\u79cd\u6570\u636e\u5e8f\u5217\uff0c\u65e0\u8bba\u662f\u5728\u6570\u636e\u5206\u6790\u3001<a href=\"https:\/\/docs.pingcode.com\/ask\/59192.html\" target=\"_blank\">\u673a\u5668\u5b66\u4e60<\/a>\u8fd8\u662f\u65e5\u5e38\u7f16\u7a0b\u4efb\u52a1\u4e2d\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>\u5982\u679c\u4f7f\u7528print(a[len(a)-1])\uff0c\u5b83\u4ee3\u8868\u4ec0\u4e48\u5462\uff1f<\/strong><\/p>\n<p>\u5728Python\u4e2d\uff0ca\u662f\u4e00\u4e2a\u5217\u8868\uff08list\uff09\u6216\u8005\u5b57\u7b26\u4e32\uff08string\uff09\uff0c\u8fd9\u884c\u4ee3\u7801\u7684\u4f5c\u7528\u662f\u6253\u5370\u5217\u8868\u6216\u5b57\u7b26\u4e32\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u3002\u901a\u8fc7len(a)\u83b7\u53d6\u5217\u8868\u6216\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\uff0c\u7136\u540e\u4f7f\u7528[len(a)-1]\u6765\u83b7\u53d6\u4f4d\u7f6e\u4e3a\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u7684\u7d22\u5f15\u503c\uff0c\u6700\u540e\u5c06\u8be5\u5143\u7d20\u901a\u8fc7print\u8bed\u53e5\u8f93\u51fa\u3002<\/p>\n<p><strong>\u6709\u6ca1\u6709\u5176\u4ed6\u65b9\u6cd5\u53ef\u4ee5\u83b7\u53d6\u5217\u8868\u6216\u5b57\u7b26\u4e32\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\uff1f<\/strong><\/p>\n<p>\u9664\u4e86\u4f7f\u7528print(a[len(a)-1])\uff0c\u8fd8\u6709\u5176\u4ed6\u7b80\u4fbf\u7684\u65b9\u5f0f\u6765\u83b7\u53d6\u5217\u8868\u6216\u5b57\u7b26\u4e32\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528a[-1]\u6765\u76f4\u63a5\u53d6\u5f97\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u7684\u503c\uff0c\u8fd9\u6837\u66f4\u52a0\u7b80\u6d01\u660e\u4e86\u3002<\/p>\n<p><strong>\u80fd\u5426\u89e3\u91ca\u4e00\u4e0blen(a)-1\u7684\u4f5c\u7528\uff1f<\/strong><\/p>\n<p>\u5728Python\u4e2d\uff0clen(a)\u51fd\u6570\u7528\u4e8e\u83b7\u53d6\u5217\u8868\u6216\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002\u7531\u4e8e\u5143\u7d20\u7684\u7d22\u5f15\u503c\u662f\u4ece0\u5f00\u59cb\u8ba1\u6570\u7684\uff0c\u6240\u4ee5\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u7684\u7d22\u5f15\u503c\u5e94\u4e3a\u957f\u5ea6\u51cf1\u3002\u56e0\u6b64\uff0c\u4f7f\u7528[len(a)-1]\u53ef\u4ee5\u5f97\u5230\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u7684\u7d22\u5f15\u503c\uff0c\u7136\u540e\u901a\u8fc7print\u8bed\u53e5\u6253\u5370\u51fa\u6765\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u8868\u8fbe\u5f0fprint(a[len(a)-1])\u7528\u4e8e\u6253\u5370\u5e8f\u5217a\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u3002\u8fd9\u91cc\u7684\u903b\u8f91\u57fa\u4e8ePy [&hellip;]","protected":false},"author":3,"featured_media":179001,"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\/178925"}],"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=178925"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/178925\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/179001"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=178925"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=178925"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=178925"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}