{"id":927169,"date":"2024-12-26T16:02:35","date_gmt":"2024-12-26T08:02:35","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/927169.html"},"modified":"2024-12-26T16:02:37","modified_gmt":"2024-12-26T08:02:37","slug":"python-%e5%a6%82%e4%bd%95%e5%8f%8d%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/927169.html","title":{"rendered":"python \u5982\u4f55\u53cd\u5e8f"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/25063438\/9d64d20d-0122-4bb8-a0a8-e6966846ada5.webp\" alt=\"python \u5982\u4f55\u53cd\u5e8f\" \/><\/p>\n<p><p> <strong>\u5728Python\u4e2d\uff0c\u53cd\u5e8f\u4e00\u4e2a\u5e8f\u5217\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u6cd5\u5b9e\u73b0\uff1a\u4f7f\u7528\u5207\u7247\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570<code>reversed()<\/code>\u3001\u4f7f\u7528\u5217\u8868\u7684<code>reverse()<\/code>\u65b9\u6cd5\u3002<\/strong>\u5176\u4e2d\uff0c\u4f7f\u7528\u5207\u7247\u662f\u4e00\u79cd\u7b80\u4fbf\u4e14\u9ad8\u6548\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5728\u4e00\u884c\u4ee3\u7801\u4e2d\u5b8c\u6210\u53cd\u5e8f\u64cd\u4f5c\u3002\u6b64\u5916\uff0c<code>reversed()<\/code>\u51fd\u6570\u4e0d\u76f4\u63a5\u8fd4\u56de\u5217\u8868\uff0c\u800c\u662f\u8fd4\u56de\u4e00\u4e2a\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff0c\u56e0\u6b64\u9700\u8981\u5c06\u5176\u8f6c\u6362\u4e3a\u5217\u8868\u6216\u5176\u4ed6\u5e8f\u5217\u7c7b\u578b\u3002\u5217\u8868\u7684<code>reverse()<\/code>\u65b9\u6cd5\u5219\u662f\u76f4\u63a5\u5728\u539f\u5217\u8868\u4e0a\u8fdb\u884c\u53cd\u5e8f\u64cd\u4f5c\uff0c\u4e0d\u4f1a\u751f\u6210\u65b0\u7684\u5217\u8868\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\u53ca\u5176\u4f7f\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n<p><p>\u4e00\u3001\u4f7f\u7528\u5207\u7247\u53cd\u5e8f<\/p>\n<\/p>\n<p><p>\u5728Python\u4e2d\uff0c\u5207\u7247\u662f\u4e00\u79cd\u975e\u5e38\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u7528\u4e8e\u5b57\u7b26\u4e32\u3001\u5217\u8868\u3001\u5143\u7ec4\u7b49\u5e8f\u5217\u7c7b\u578b\u3002\u901a\u8fc7\u5207\u7247\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5b9e\u73b0\u5e8f\u5217\u7684\u53cd\u5e8f\u64cd\u4f5c\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\"># \u793a\u4f8b\u4ee3\u7801<\/p>\n<p>my_list = [1, 2, 3, 4, 5]<\/p>\n<p>reversed_list = my_list[::-1]<\/p>\n<p>print(reversed_list)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u5728\u4e8e\u7b80\u6d01\u4e14\u9ad8\u6548\uff0c\u56e0\u4e3a\u5b83\u5728\u5185\u5b58\u4e2d\u751f\u6210\u4e86\u4e00\u4e2a\u65b0\u7684\u5e8f\u5217\uff0c\u5e76\u4e0d\u6539\u53d8\u539f\u6709\u7684\u5e8f\u5217\u3002\u5207\u7247\u64cd\u4f5c\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(n)\uff0c\u9002\u7528\u4e8e\u9700\u8981\u9891\u7e41\u53cd\u5e8f\u7684\u60c5\u5883\u3002<\/p>\n<\/p>\n<p><p>\u4e8c\u3001\u4f7f\u7528reversed()\u51fd\u6570<\/p>\n<\/p>\n<p><p><code>reversed()<\/code>\u662fPython\u5185\u7f6e\u7684\u4e00\u4e2a\u51fd\u6570\uff0c\u53ef\u4ee5\u5c06\u4efb\u4f55\u5e8f\u5217\u8fd4\u56de\u4e00\u4e2a\u53cd\u5411\u8fed\u4ee3\u5668\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5b83\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u8fed\u4ee3\u5668\u5bf9\u8c61\uff0c\u800c\u4e0d\u662f\u5217\u8868\u6216\u5b57\u7b26\u4e32\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\"># \u793a\u4f8b\u4ee3\u7801<\/p>\n<p>my_list = [1, 2, 3, 4, 5]<\/p>\n<p>reversed_iterator = reversed(my_list)<\/p>\n<p>reversed_list = list(reversed_iterator)<\/p>\n<p>print(reversed_list)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u5728\u8fed\u4ee3\u8fc7\u7a0b\u4e2d\u53cd\u5e8f\u7684\u60c5\u51b5\uff0c\u56e0\u4e3a\u5b83\u907f\u514d\u4e86\u521b\u5efa\u65b0\u7684\u5e8f\u5217\uff0c\u4ece\u800c\u8282\u7701\u5185\u5b58\u3002\u5f53\u9700\u8981\u591a\u6b21\u4f7f\u7528\u53cd\u5e8f\u7ed3\u679c\u65f6\uff0c\u53ef\u4ee5\u5c06\u5176\u8f6c\u6362\u4e3a\u5217\u8868\u3002<\/p>\n<\/p>\n<p><p>\u4e09\u3001\u4f7f\u7528\u5217\u8868\u7684reverse()\u65b9\u6cd5<\/p>\n<\/p>\n<p><p>\u5217\u8868\u5bf9\u8c61\u63d0\u4f9b\u4e86\u4e00\u4e2a<code>reverse()<\/code>\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5728\u539f\u5730\u5bf9\u5217\u8868\u8fdb\u884c\u53cd\u5e8f\u3002\u4e0e\u524d\u4e24\u79cd\u65b9\u6cd5\u4e0d\u540c\uff0c\u8fd9\u79cd\u65b9\u6cd5\u4f1a\u76f4\u63a5\u4fee\u6539\u539f\u5217\u8868\uff0c\u4e0d\u4f1a\u521b\u5efa\u65b0\u7684\u5217\u8868\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\"># \u793a\u4f8b\u4ee3\u7801<\/p>\n<p>my_list = [1, 2, 3, 4, 5]<\/p>\n<p>my_list.reverse()<\/p>\n<p>print(my_list)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u4e0d\u9700\u8981\u4fdd\u7559\u539f\u5e8f\u5217\u7684\u60c5\u51b5\uff0c\u56e0\u4e3a\u5b83\u76f4\u63a5\u5728\u5217\u8868\u4e0a\u64cd\u4f5c\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(n)\uff0c\u4e14\u4e0d\u9700\u8981\u989d\u5916\u7684\u5185\u5b58\u5f00\u9500\u3002\u5bf9\u4e8e\u9700\u8981\u9891\u7e41\u4fee\u6539\u5217\u8868\u5185\u5bb9\u7684\u573a\u666f\uff0c\u8fd9\u79cd\u65b9\u6cd5\u662f\u4e00\u4e2a\u7406\u60f3\u7684\u9009\u62e9\u3002<\/p>\n<\/p>\n<p><p>\u56db\u3001\u5b57\u7b26\u4e32\u53cd\u5e8f<\/p>\n<\/p>\n<p><p>\u5728Python\u4e2d\uff0c\u5b57\u7b26\u4e32\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u56e0\u6b64\u4e0d\u80fd\u76f4\u63a5\u4f7f\u7528<code>reverse()<\/code>\u65b9\u6cd5\u3002\u4f46\u53ef\u4ee5\u4f7f\u7528\u5207\u7247\u548c<code>reversed()<\/code>\u51fd\u6570\u5b9e\u73b0\u5b57\u7b26\u4e32\u7684\u53cd\u5e8f\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\"># \u4f7f\u7528\u5207\u7247<\/p>\n<p>my_string = &quot;hello&quot;<\/p>\n<p>reversed_string = my_string[::-1]<\/p>\n<p>print(reversed_string)<\/p>\n<h2><strong>\u4f7f\u7528reversed()\u51fd\u6570<\/strong><\/h2>\n<p>reversed_iterator = reversed(my_string)<\/p>\n<p>reversed_string = &#39;&#39;.join(reversed_iterator)<\/p>\n<p>print(reversed_string)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5bf9\u4e8e\u5b57\u7b26\u4e32\u53cd\u5e8f\uff0c\u5207\u7247\u662f\u6700\u7b80\u6d01\u7684\u65b9\u6cd5\uff0c\u800c<code>reversed()<\/code>\u5219\u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u7075\u6d3b\u7684\u65b9\u5f0f\uff0c\u7279\u522b\u662f\u5728\u9700\u8981\u9010\u6b65\u5904\u7406\u5b57\u7b26\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n<p><p>\u4e94\u3001\u53cd\u5e8f\u5e94\u7528\u573a\u666f<\/p>\n<\/p>\n<p><p>\u53cd\u5e8f\u64cd\u4f5c\u5728\u8bb8\u591a\u7b97\u6cd5\u4e2d\u90fd\u6709\u5e94\u7528\uff0c\u4f8b\u5982\uff1a\u56de\u6587\u68c0\u6d4b\u3001\u6570\u636e\u7ed3\u6784\u64cd\u4f5c\uff08\u5982\u6808\u7684\u5b9e\u73b0\uff09\u3001\u6392\u5e8f\u7b97\u6cd5\u7684\u4f18\u5316\u7b49\u3002\u5728\u8fd9\u4e9b\u573a\u666f\u4e2d\uff0c\u9009\u62e9\u5408\u9002\u7684\u53cd\u5e8f\u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u6548\u7387\u548c\u53ef\u8bfb\u6027\u3002<\/p>\n<\/p>\n<ol>\n<li>\n<p><strong>\u56de\u6587\u68c0\u6d4b<\/strong>\uff1a\u901a\u8fc7\u53cd\u5e8f\u5b57\u7b26\u4e32\u5e76\u6bd4\u8f83\uff0c\u53ef\u4ee5\u7b80\u5355\u5730\u5224\u65ad\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u662f\u56de\u6587\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">def is_palindrome(s):<\/p>\n<p>    return s == s[::-1]<\/p>\n<p>print(is_palindrome(&quot;radar&quot;))  # \u8f93\u51fa: True<\/p>\n<p><\/code><\/pre>\n<\/p>\n<\/li>\n<li>\n<p><strong>\u6570\u636e\u7ed3\u6784\u64cd\u4f5c<\/strong>\uff1a\u5728\u5b9e\u73b0\u6808\u8fd9\u79cd\u6570\u636e\u7ed3\u6784\u65f6\uff0c\u53cd\u5e8f\u64cd\u4f5c\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5b9e\u73b0\u51fa\u6808\u64cd\u4f5c\u3002<\/p>\n<\/p>\n<\/li>\n<li>\n<p><strong>\u6392\u5e8f\u7b97\u6cd5\u4f18\u5316<\/strong>\uff1a\u5728\u67d0\u4e9b\u6392\u5e8f\u7b97\u6cd5\u4e2d\uff0c\u53cd\u5e8f\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5feb\u901f\u627e\u5230\u67d0\u4e9b\u7279\u5b9a\u6392\u5217\uff08\u5982\u5b57\u5178\u5e8f\u6392\u5217\uff09\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n<p><p>\u516d\u3001\u6027\u80fd\u5206\u6790\u4e0e\u6ce8\u610f\u4e8b\u9879<\/p>\n<\/p>\n<p><p>\u9009\u62e9\u53cd\u5e8f\u65b9\u6cd5\u65f6\uff0c\u6027\u80fd\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u8003\u91cf\u56e0\u7d20\u3002\u5207\u7247\u548c<code>reversed()<\/code>\u51fd\u6570\u90fd\u5177\u6709O(n)\u7684\u65f6\u95f4\u590d\u6742\u5ea6\uff0c\u4f46\u5728\u5185\u5b58\u4f7f\u7528\u4e0a\u6709\u6240\u4e0d\u540c\u3002<code>reverse()<\/code>\u65b9\u6cd5\u5219\u56e0\u4e3a\u5728\u539f\u5730\u64cd\u4f5c\uff0c\u6ca1\u6709\u989d\u5916\u7684\u5185\u5b58\u5f00\u9500\uff0c\u56e0\u6b64\u5728\u9700\u8981\u9891\u7e41\u4fee\u6539\u6570\u636e\u7684\u573a\u666f\u4e2d\uff0c\u6027\u80fd\u8868\u73b0\u66f4\u4f73\u3002<\/p>\n<\/p>\n<p><p>\u6b64\u5916\uff0c\u5728\u4f7f\u7528<code>reversed()<\/code>\u51fd\u6570\u65f6\uff0c\u6ce8\u610f\u5b83\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u8fed\u4ee3\u5668\u5bf9\u8c61\uff0c\u5982\u679c\u9700\u8981\u591a\u6b21\u904d\u5386\uff0c\u5fc5\u987b\u5148\u5c06\u5176\u8f6c\u6362\u4e3a\u5217\u8868\u6216\u5176\u4ed6\u5e8f\u5217\u3002<\/p>\n<\/p>\n<p><p>\u7efc\u4e0a\u6240\u8ff0\uff0cPython\u63d0\u4f9b\u4e86\u591a\u79cd\u53cd\u5e8f\u65b9\u6cd5\uff0c\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u9002\u7528\u7684\u573a\u666f\u548c\u4f18\u7f3a\u70b9\u3002\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\uff0c\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u6548\u7387\u548c\u53ef\u8bfb\u6027\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p> <strong>\u53cd\u5e8f\u5b57\u7b26\u4e32\u5728Python\u4e2d\u53ef\u4ee5\u5982\u4f55\u5b9e\u73b0\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u79cd\u65b9\u6cd5\u53cd\u8f6c\u5b57\u7b26\u4e32\u3002\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u5229\u7528\u5207\u7247\u529f\u80fd\uff0c\u4f8b\u5982 <code>reversed_string = original_string[::-1]<\/code>\u3002\u6b64\u5916\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528 <code>join<\/code> \u548c <code>reversed<\/code> \u51fd\u6570\u7ed3\u5408\uff0c\u50cf\u8fd9\u6837\uff1a<code>reversed_string = &#39;&#39;.join(reversed(original_string))<\/code>\u3002\u8fd9\u4e24\u79cd\u65b9\u6cd5\u90fd\u975e\u5e38\u9ad8\u6548\uff0c\u9002\u5408\u5904\u7406\u77ed\u5b57\u7b26\u4e32\u3002<\/p>\n<p><strong>\u5728Python\u4e2d\u53ef\u4ee5\u53cd\u5e8f\u5217\u8868\u5417\uff1f\u5982\u679c\u53ef\u4ee5\uff0c\u600e\u4e48\u505a\uff1f<\/strong><br \/>\u5f53\u7136\u53ef\u4ee5\uff0cPython\u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u6cd5\u6765\u53cd\u8f6c\u5217\u8868\u3002\u53ef\u4ee5\u4f7f\u7528 <code>list.reverse()<\/code> \u65b9\u6cd5\u76f4\u63a5\u4fee\u6539\u539f\u59cb\u5217\u8868\uff0c\u6216\u8005\u4f7f\u7528 <code>reversed()<\/code> \u51fd\u6570\u751f\u6210\u4e00\u4e2a\u53cd\u8f6c\u540e\u7684\u8fed\u4ee3\u5668\u3002\u4f8b\u5982\uff1a  <\/p>\n<pre><code class=\"language-python\">my_list = [1, 2, 3, 4]\nmy_list.reverse()  # \u53cd\u8f6c\u539f\u59cb\u5217\u8868\n# \u6216\u8005\nreversed_list = list(reversed(my_list))  # \u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u53cd\u8f6c\u5217\u8868\n<\/code><\/pre>\n<p>\u8fd9\u4e24\u79cd\u65b9\u5f0f\u5404\u6709\u5176\u4f7f\u7528\u573a\u666f\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u5f0f\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3002<\/p>\n<p><strong>\u5982\u4f55\u5728Python\u4e2d\u53cd\u8f6c\u5b57\u5178\u7684\u952e\u503c\u5bf9\uff1f<\/strong><br \/>\u53cd\u8f6c\u5b57\u5178\u7684\u952e\u503c\u5bf9\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u63a8\u5bfc\u5f0f\u3002\u53ef\u4ee5\u901a\u8fc7\u904d\u5386\u539f\u59cb\u5b57\u5178\uff0c\u5c06\u503c\u4f5c\u4e3a\u65b0\u7684\u952e\uff0c\u952e\u4f5c\u4e3a\u65b0\u7684\u503c\u6765\u5b9e\u73b0\u3002\u4f8b\u5982\uff1a  <\/p>\n<pre><code class=\"language-python\">original_dict = {&#39;a&#39;: 1, &#39;b&#39;: 2, &#39;c&#39;: 3}\nreversed_dict = {value: key for key, value in original_dict.items()}\n<\/code><\/pre>\n<p>\u8fd9\u6837\u53ef\u4ee5\u9ad8\u6548\u5730\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b57\u5178\uff0c\u5176\u4e2d\u539f\u6765\u7684\u503c\u53d8\u4e3a\u952e\uff0c\u539f\u6765\u7684\u952e\u53d8\u4e3a\u503c\u3002\u4e0d\u8fc7\uff0c\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5982\u679c\u539f\u5b57\u5178\u4e2d\u6709\u91cd\u590d\u7684\u503c\uff0c\u53cd\u8f6c\u540e\u4f1a\u4e22\u5931\u91cd\u590d\u7684\u952e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u53cd\u5e8f\u4e00\u4e2a\u5e8f\u5217\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u6cd5\u5b9e\u73b0\uff1a\u4f7f\u7528\u5207\u7247\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570reversed()\u3001\u4f7f\u7528\u5217\u8868\u7684re [&hellip;]","protected":false},"author":3,"featured_media":927172,"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\/927169"}],"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=927169"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/927169\/revisions"}],"predecessor-version":[{"id":927174,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/927169\/revisions\/927174"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/927172"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=927169"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=927169"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=927169"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}