{"id":1120680,"date":"2025-01-08T18:59:16","date_gmt":"2025-01-08T10:59:16","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1120680.html"},"modified":"2025-01-08T18:59:19","modified_gmt":"2025-01-08T10:59:19","slug":"python%e5%a6%82%e4%bd%95%e7%9f%a5%e9%81%93%e4%b8%80%e4%b8%aalist%e7%9a%84%e9%95%bf%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1120680.html","title":{"rendered":"python\u5982\u4f55\u77e5\u9053\u4e00\u4e2alist\u7684\u957f\u5ea6"},"content":{"rendered":"

\"python\u5982\u4f55\u77e5\u9053\u4e00\u4e2alist\u7684\u957f\u5ea6\"<\/p>\n

\u4f7f\u7528Python\u83b7\u53d6\u5217\u8868\u957f\u5ea6\u7684\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528\u5185\u7f6e\u51fd\u6570len()\u3001\u901a\u8fc7\u8fed\u4ee3\u8ba1\u7b97\u3001\u5229\u7528numpy\u5e93\u7b49\u3002<\/strong> \u5176\u4e2d\uff0c\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u4f7f\u7528Python\u7684\u5185\u7f6e\u51fd\u6570len()<\/code>\uff0c\u56e0\u4e3a\u5b83\u7b80\u5355\u4e14\u9ad8\u6548\u3002\u4e0b\u9762\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u5e76\u63a2\u8ba8\u5b83\u4eec\u7684\u4f18\u7f3a\u70b9\u548c\u9002\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n

\n

\u4e00\u3001\u5185\u7f6e\u51fd\u6570len()<\/h2>\n<\/p>\n

Python\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5185\u7f6e\u51fd\u6570len()<\/code>\uff0c\u5b83\u53ef\u4ee5\u76f4\u63a5\u8fd4\u56de\u5217\u8868\u7684\u957f\u5ea6\u3002\u8fd9\u662f\u83b7\u53d6\u5217\u8868\u957f\u5ea6\u6700\u5e38\u7528\u548c\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u4f7f\u7528\u65b9\u6cd5<\/h3>\n<\/p>\n

my_list = [1, 2, 3, 4, 5]<\/p>\n
length = len(my_list)<\/p>\n
print(length)  # \u8f93\u51fa: 5<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f18\u70b9<\/h3>\n<\/p>\n
    \n
  • \u7b80\u5355\u6613\u7528<\/strong>\uff1a\u53ea\u9700\u4e00\u884c\u4ee3\u7801\u5373\u53ef\u83b7\u5f97\u5217\u8868\u957f\u5ea6\u3002<\/li>\n
  • \u9ad8\u6548<\/strong>\uff1alen()<\/code>\u51fd\u6570\u5728\u540e\u53f0\u662f\u901a\u8fc7\u8bfb\u53d6\u5217\u8868\u5bf9\u8c61\u7684\u4e00\u4e2a\u5185\u90e8\u53d8\u91cf\u5b9e\u73b0\u7684\uff0c\u56e0\u6b64\u5176\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(1)\u3002<\/li>\n<\/ul>\n
    \u9002\u7528\u573a\u666f<\/h3>\n<\/p>\n
    \u9002\u7528\u4e8e\u4efb\u4f55\u9700\u8981\u83b7\u53d6\u5217\u8868\u957f\u5ea6\u7684\u573a\u666f\uff0c\u5c24\u5176\u662f\u5728\u4ee3\u7801\u7b80\u6d01\u6027\u548c\u6267\u884c\u6548\u7387\u90fd\u5f88\u91cd\u8981\u7684\u60c5\u51b5\u4e0b\u3002<\/p>\n<\/p>\n
    \n
    \u4e8c\u3001\u901a\u8fc7\u8fed\u4ee3\u8ba1\u7b97<\/h2>\n<\/p>\n
    \u8fd9\u79cd\u65b9\u6cd5\u662f\u901a\u8fc7\u8fed\u4ee3\u5217\u8868\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\u6765\u8ba1\u7b97\u5217\u8868\u7684\u957f\u5ea6\u3002\u867d\u7136\u4e0d\u5982len()<\/code>\u51fd\u6570\u9ad8\u6548\uff0c\u4f46\u5b83\u53ef\u4ee5\u5e2e\u52a9\u7406\u89e3\u5217\u8868\u7684\u57fa\u672c\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
    \u4f7f\u7528\u65b9\u6cd5<\/h3>\n<\/p>\n
    my_list = [1, 2, 3, 4, 5]<\/p>\n
    length = 0<\/p>\n
    for item in my_list:<\/p>\n
        length += 1<\/p>\n
    print(length)  # \u8f93\u51fa: 5<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u4f18\u70b9<\/h3>\n<\/p>\n
      \n
    • \u5b66\u4e60\u4ef7\u503c<\/strong>\uff1a\u6709\u52a9\u4e8e\u7406\u89e3\u5217\u8868\u7684\u57fa\u672c\u64cd\u4f5c\u548c\u8fed\u4ee3\u673a\u5236\u3002<\/li>\n
    • \u7075\u6d3b\u6027<\/strong>\uff1a\u53ef\u4ee5\u5728\u5faa\u73af\u4e2d\u52a0\u5165\u66f4\u591a\u64cd\u4f5c\uff0c\u4f8b\u5982\u5bf9\u7279\u5b9a\u5143\u7d20\u7684\u5904\u7406\u3002<\/li>\n<\/ul>\n
      \u7f3a\u70b9<\/h3>\n<\/p>\n
        \n
      • \u4f4e\u6548<\/strong>\uff1a\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(n)\uff0c\u5bf9\u4e8e\u5927\u5217\u8868\u6765\u8bf4\u6027\u80fd\u4e0d\u4f73\u3002<\/li>\n<\/ul>\n
        \u9002\u7528\u573a\u666f<\/h3>\n<\/p>\n
        \u9002\u7528\u4e8e\u5b66\u4e60\u548c\u6559\u5b66\u573a\u666f\uff0c\u6216\u8005\u9700\u8981\u5728\u8fed\u4ee3\u8fc7\u7a0b\u4e2d\u6267\u884c\u5176\u4ed6\u64cd\u4f5c\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n
        \n
        \u4e09\u3001\u5229\u7528numpy\u5e93<\/h2>\n<\/p>\n
        \u5982\u679c\u4f60\u6b63\u5728\u4f7f\u7528numpy\u5e93\u5904\u7406\u5927\u91cf\u6570\u636e\uff0c\u90a3\u4e48\u4f60\u53ef\u4ee5\u4f7f\u7528numpy\u63d0\u4f9b\u7684\u65b9\u6cd5\u6765\u83b7\u53d6\u6570\u7ec4\u6216\u5217\u8868\u7684\u957f\u5ea6\u3002<\/p>\n<\/p>\n
        \u4f7f\u7528\u65b9\u6cd5<\/h3>\n<\/p>\n
        import numpy as np<\/p>\n
        my_list = [1, 2, 3, 4, 5]<\/p>\n
        np_array = np.array(my_list)<\/p>\n
        length = np_array.size<\/p>\n
        print(length)  # \u8f93\u51fa: 5<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        \u4f18\u70b9<\/h3>\n<\/p>\n
          \n
        • \u9ad8\u6548<\/strong>\uff1anumpy\u5728\u5904\u7406\u5927\u6570\u636e\u96c6\u65f6\u975e\u5e38\u9ad8\u6548\u3002<\/li>\n
        • \u529f\u80fd\u4e30\u5bcc<\/strong>\uff1anumpy\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u6570\u7ec4\u64cd\u4f5c\u51fd\u6570\u3002<\/li>\n<\/ul>\n
          \u7f3a\u70b9<\/h3>\n<\/p>\n
            \n
          • \u4f9d\u8d56\u6027<\/strong>\uff1a\u9700\u8981\u5b89\u88c5\u548c\u5bfc\u5165numpy\u5e93\u3002<\/li>\n
          • \u590d\u6742\u6027<\/strong>\uff1a\u5bf9\u4e8e\u7b80\u5355\u4efb\u52a1\u6765\u8bf4\uff0cnumpy\u53ef\u80fd\u663e\u5f97\u8fc7\u4e8e\u590d\u6742\u3002<\/li>\n<\/ul>\n
            \u9002\u7528\u573a\u666f<\/h3>\n<\/p>\n
            \u9002\u7528\u4e8e\u6570\u636e\u79d1\u5b66\u548c\u9700\u8981\u5904\u7406\u5927\u89c4\u6a21\u6570\u7ec4\u7684\u6570\u636e\u5206\u6790\u573a\u666f\u3002<\/p>\n<\/p>\n
            \n
            \u56db\u3001\u5229\u7528pandas\u5e93<\/h2>\n<\/p>\n
            \u5728\u6570\u636e\u5206\u6790\u4e2d\uff0cpandas\u5e93\u662f\u4e00\u4e2a\u975e\u5e38\u5e38\u7528\u7684\u5de5\u5177\u3002\u4f60\u53ef\u4ee5\u7528pandas\u6765\u5904\u7406\u6570\u636e\u6846\u548c\u7cfb\u5217\uff0c\u5e76\u4e14\u53ef\u4ee5\u5f88\u65b9\u4fbf\u5730\u83b7\u53d6\u5b83\u4eec\u7684\u957f\u5ea6\u3002<\/p>\n<\/p>\n
            \u4f7f\u7528\u65b9\u6cd5<\/h3>\n<\/p>\n
            import pandas as pd<\/p>\n
            my_list = [1, 2, 3, 4, 5]<\/p>\n
            series = pd.Series(my_list)<\/p>\n
            length = series.size<\/p>\n
            print(length)  # \u8f93\u51fa: 5<\/p>\n
            <\/code><\/pre>\n<\/p>\n
            \u4f18\u70b9<\/h3>\n<\/p>\n
              \n
            • \u9ad8\u6548<\/strong>\uff1apandas\u5728\u5904\u7406\u6570\u636e\u6846\u548c\u7cfb\u5217\u65f6\u975e\u5e38\u9ad8\u6548\u3002<\/li>\n
            • \u529f\u80fd\u4e30\u5bcc<\/strong>\uff1apandas\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u6570\u636e\u64cd\u4f5c\u51fd\u6570\u3002<\/li>\n<\/ul>\n
              \u7f3a\u70b9<\/h3>\n<\/p>\n
                \n
              • \u4f9d\u8d56\u6027<\/strong>\uff1a\u9700\u8981\u5b89\u88c5\u548c\u5bfc\u5165pandas\u5e93\u3002<\/li>\n
              • \u590d\u6742\u6027<\/strong>\uff1a\u5bf9\u4e8e\u7b80\u5355\u4efb\u52a1\u6765\u8bf4\uff0cpandas\u53ef\u80fd\u663e\u5f97\u8fc7\u4e8e\u590d\u6742\u3002<\/li>\n<\/ul>\n
                \u9002\u7528\u573a\u666f<\/h3>\n<\/p>\n
                \u9002\u7528\u4e8e\u6570\u636e\u5206\u6790\u548c\u9700\u8981\u5904\u7406\u6570\u636e\u6846\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
                \n
                \u4e94\u3001\u624b\u52a8\u7ef4\u62a4\u957f\u5ea6\u53d8\u91cf<\/h2>\n<\/p>\n
                \u5728\u67d0\u4e9b\u7279\u5b9a\u573a\u666f\u4e0b\uff0c\u4f60\u53ef\u80fd\u9700\u8981\u624b\u52a8\u7ef4\u62a4\u5217\u8868\u7684\u957f\u5ea6\u3002\u5c3d\u7ba1\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u5e38\u89c1\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u53ef\u80fd\u4f1a\u5f88\u6709\u7528\u3002<\/p>\n<\/p>\n
                \u4f7f\u7528\u65b9\u6cd5<\/h3>\n<\/p>\n
                my_list = [1, 2, 3, 4, 5]<\/p>\n
                length = 0<\/p>\n
                \u6dfb\u52a0\u5143\u7d20\u65f6\u66f4\u65b0\u957f\u5ea6<\/strong><\/h2>\n
                my_list.append(6)<\/p>\n
                length += 1<\/p>\n
                \u79fb\u9664\u5143\u7d20\u65f6\u66f4\u65b0\u957f\u5ea6<\/strong><\/h2>\n
                my_list.pop()<\/p>\n
                length -= 1<\/p>\n
                print(length)  # \u8f93\u51fa: 5<\/p>\n
                <\/code><\/pre>\n<\/p>\n
                \u4f18\u70b9<\/h3>\n<\/p>\n
                  \n
                • \u7075\u6d3b\u6027<\/strong>\uff1a\u53ef\u4ee5\u5728\u4efb\u4f55\u64cd\u4f5c\u4e2d\u66f4\u65b0\u957f\u5ea6\u3002<\/li>\n
                • \u63a7\u5236\u529b<\/strong>\uff1a\u53ef\u4ee5\u7cbe\u786e\u63a7\u5236\u957f\u5ea6\u53d8\u91cf\u7684\u66f4\u65b0\u3002<\/li>\n<\/ul>\n
                  \u7f3a\u70b9<\/h3>\n<\/p>\n
                    \n
                  • \u6613\u9519\u6027<\/strong>\uff1a\u5bb9\u6613\u5728\u66f4\u65b0\u957f\u5ea6\u65f6\u51fa\u9519\u3002<\/li>\n
                  • \u590d\u6742\u6027<\/strong>\uff1a\u9700\u8981\u624b\u52a8\u7ef4\u62a4\u957f\u5ea6\u53d8\u91cf\uff0c\u589e\u52a0\u4e86\u4ee3\u7801\u7684\u590d\u6742\u5ea6\u3002<\/li>\n<\/ul>\n
                    \u9002\u7528\u573a\u666f<\/h3>\n<\/p>\n
                    \u9002\u7528\u4e8e\u9700\u8981\u7cbe\u786e\u63a7\u5236\u5217\u8868\u957f\u5ea6\u66f4\u65b0\u7684\u7279\u5b9a\u573a\u666f\u3002<\/p>\n<\/p>\n
                    \n
                    \u516d\u3001\u901a\u8fc7\u9012\u5f52\u8ba1\u7b97<\/h2>\n<\/p>\n
                    \u9012\u5f52\u662f\u4e00\u79cd\u89e3\u51b3\u95ee\u9898\u7684\u65b9\u6cd5\uff0c\u5b83\u901a\u8fc7\u51fd\u6570\u81ea\u8c03\u7528\u6765\u89e3\u51b3\u95ee\u9898\u3002\u867d\u7136\u4e0d\u5e38\u7528\u4e8e\u8ba1\u7b97\u5217\u8868\u957f\u5ea6\uff0c\u4f46\u5b83\u5c55\u793a\u4e86\u9012\u5f52\u7684\u57fa\u672c\u601d\u60f3\u3002<\/p>\n<\/p>\n
                    \u4f7f\u7528\u65b9\u6cd5<\/h3>\n<\/p>\n
                    def list_length(lst):<\/p>\n
                        if lst == []:<\/p>\n
                            return 0<\/p>\n
                        else:<\/p>\n
                            return 1 + list_length(lst[1:])<\/p>\n
                    my_list = [1, 2, 3, 4, 5]<\/p>\n
                    length = list_length(my_list)<\/p>\n
                    print(length)  # \u8f93\u51fa: 5<\/p>\n
                    <\/code><\/pre>\n<\/p>\n
                    \u4f18\u70b9<\/h3>\n<\/p>\n
                      \n
                    • \u5b66\u4e60\u4ef7\u503c<\/strong>\uff1a\u6709\u52a9\u4e8e\u7406\u89e3\u9012\u5f52\u7684\u57fa\u672c\u6982\u5ff5\u3002<\/li>\n
                    • \u7b80\u6d01\u6027<\/strong>\uff1a\u4ee3\u7801\u7b80\u6d01\uff0c\u6613\u8bfb\u3002<\/li>\n<\/ul>\n
                      \u7f3a\u70b9<\/h3>\n<\/p>\n
                        \n
                      • \u4f4e\u6548<\/strong>\uff1a\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(n)\uff0c\u5bf9\u4e8e\u5927\u5217\u8868\u6765\u8bf4\u6027\u80fd\u4e0d\u4f73\u3002<\/li>\n
                      • \u5806\u6808\u6ea2\u51fa<\/strong>\uff1a\u5bf9\u4e8e\u975e\u5e38\u957f\u7684\u5217\u8868\uff0c\u9012\u5f52\u53ef\u80fd\u5bfc\u81f4\u5806\u6808\u6ea2\u51fa\u3002<\/li>\n<\/ul>\n
                        \u9002\u7528\u573a\u666f<\/h3>\n<\/p>\n
                        \u9002\u7528\u4e8e\u5b66\u4e60\u548c\u6559\u5b66\u573a\u666f\uff0c\u6216\u8005\u9700\u8981\u4f7f\u7528\u9012\u5f52\u89e3\u51b3\u95ee\u9898\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n
                        \n
                        \u4e03\u3001\u901a\u8fc7\u96c6\u5408set\u7684\u957f\u5ea6<\/h2>\n<\/p>\n
                        \u867d\u7136\u4e0d\u5e38\u89c1\uff0c\u4f46\u4f60\u53ef\u4ee5\u901a\u8fc7\u5c06\u5217\u8868\u8f6c\u6362\u4e3a\u96c6\u5408\u6765\u83b7\u53d6\u5176\u957f\u5ea6\u3002\u8fd9\u4e3b\u8981\u7528\u4e8e\u53bb\u91cd\u540e\u7684\u957f\u5ea6\u8ba1\u7b97\u3002<\/p>\n<\/p>\n
                        \u4f7f\u7528\u65b9\u6cd5<\/h3>\n<\/p>\n
                        my_list = [1, 2, 3, 4, 5, 5]<\/p>\n
                        unique_length = len(set(my_list))<\/p>\n
                        print(unique_length)  # \u8f93\u51fa: 5<\/p>\n
                        <\/code><\/pre>\n<\/p>\n
                        \u4f18\u70b9<\/h3>\n<\/p>\n
                          \n
                        • \u53bb\u91cd<\/strong>\uff1a\u53ef\u4ee5\u540c\u65f6\u53bb\u9664\u5217\u8868\u4e2d\u7684\u91cd\u590d\u5143\u7d20\u3002<\/li>\n
                        • \u7b80\u6d01<\/strong>\uff1a\u4ee3\u7801\u7b80\u5355\uff0c\u6613\u8bfb\u3002<\/li>\n<\/ul>\n
                          \u7f3a\u70b9<\/h3>\n<\/p>\n
                            \n
                          • \u4e0d\u4fdd\u7559\u987a\u5e8f<\/strong>\uff1a\u96c6\u5408\u4e0d\u4fdd\u7559\u5143\u7d20\u7684\u63d2\u5165\u987a\u5e8f\u3002<\/li>\n
                          • \u4f9d\u8d56\u6027<\/strong>\uff1a\u9700\u8981\u5c06\u5217\u8868\u8f6c\u6362\u4e3a\u96c6\u5408\u3002<\/li>\n<\/ul>\n
                            \u9002\u7528\u573a\u666f<\/h3>\n<\/p>\n
                            \u9002\u7528\u4e8e\u9700\u8981\u53bb\u91cd\u5e76\u8ba1\u7b97\u957f\u5ea6\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
                            \n
                            \u516b\u3001\u901a\u8fc7\u81ea\u5b9a\u4e49\u7c7b\u548c\u65b9\u6cd5<\/h2>\n<\/p>\n
                            \u5728\u67d0\u4e9b\u9ad8\u7ea7\u5e94\u7528\u4e2d\uff0c\u4f60\u53ef\u80fd\u9700\u8981\u81ea\u5b9a\u4e49\u7c7b\u548c\u65b9\u6cd5\u6765\u5904\u7406\u5217\u8868\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7\u81ea\u5b9a\u4e49\u7c7b\u6765\u5b9e\u73b0\u83b7\u53d6\u5217\u8868\u957f\u5ea6\u7684\u529f\u80fd\u3002<\/p>\n<\/p>\n
                            \u4f7f\u7528\u65b9\u6cd5<\/h3>\n<\/p>\n
                            class CustomList:<\/p>\n
                                def __init__(self, initial_list):<\/p>\n
                                    self.list = initial_list<\/p>\n
                                def get_length(self):<\/p>\n
                                    return len(self.list)<\/p>\n
                            my_list = CustomList([1, 2, 3, 4, 5])<\/p>\n
                            length = my_list.get_length()<\/p>\n
                            print(length)  # \u8f93\u51fa: 5<\/p>\n
                            <\/code><\/pre>\n<\/p>\n
                            \u4f18\u70b9<\/h3>\n<\/p>\n
                              \n
                            • \u7075\u6d3b\u6027<\/strong>\uff1a\u53ef\u4ee5\u81ea\u5b9a\u4e49\u7c7b\u7684\u884c\u4e3a\u548c\u65b9\u6cd5\u3002<\/li>\n
                            • \u5c01\u88c5\u6027<\/strong>\uff1a\u63d0\u9ad8\u4ee3\u7801\u7684\u5c01\u88c5\u6027\u548c\u53ef\u8bfb\u6027\u3002<\/li>\n<\/ul>\n
                              \u7f3a\u70b9<\/h3>\n<\/p>\n
                                \n
                              • \u590d\u6742\u6027<\/strong>\uff1a\u589e\u52a0\u4e86\u4ee3\u7801\u7684\u590d\u6742\u5ea6\u3002<\/li>\n
                              • \u7ef4\u62a4\u6027<\/strong>\uff1a\u9700\u8981\u7ef4\u62a4\u81ea\u5b9a\u4e49\u7c7b\u548c\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n
                                \u9002\u7528\u573a\u666f<\/h3>\n<\/p>\n
                                \u9002\u7528\u4e8e\u9700\u8981\u81ea\u5b9a\u4e49\u884c\u4e3a\u548c\u65b9\u6cd5\u7684\u9ad8\u7ea7\u5e94\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n
                                \n
                                \u901a\u8fc7\u4ee5\u4e0a\u51e0\u79cd\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u4f7f\u7528Python\u83b7\u53d6\u5217\u8868\u957f\u5ea6\u7684\u65b9\u6cd5\u5404\u6709\u4f18\u7f3a\u70b9\uff0c\u9009\u62e9\u9002\u5408\u81ea\u5df1\u9700\u6c42\u7684\u65b9\u6cd5\u975e\u5e38\u91cd\u8981\u3002<\/strong> \u65e0\u8bba\u662f\u7b80\u5355\u7684len()<\/code>\u51fd\u6570\uff0c\u8fd8\u662f\u9ad8\u7ea7\u7684\u6570\u636e\u79d1\u5b66\u5e93\uff0c\u5982numpy\u548cpandas\uff0cPython\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u5de5\u5177\u6765\u6ee1\u8db3\u4e0d\u540c\u7684\u9700\u6c42\u3002\u7406\u89e3\u8fd9\u4e9b\u65b9\u6cd5\u7684\u4f18\u7f3a\u70b9\u548c\u9002\u7528\u573a\u666f\uff0c\u5c06\u6709\u52a9\u4e8e\u4f60\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u505a\u51fa\u6700\u4f73\u9009\u62e9\u3002<\/p>\n<\/p>\n
                                \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
                                 \u5982\u4f55\u5728Python\u4e2d\u83b7\u53d6\u4e00\u4e2a\u5217\u8868\u7684\u957f\u5ea6\uff1f<\/strong>
                                \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7684len()<\/code>\u51fd\u6570\u6765\u83b7\u53d6\u5217\u8868\u7684\u957f\u5ea6\u3002\u53ea\u9700\u5c06\u5217\u8868\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9len()<\/code>\uff0c\u5b83\u5c06\u8fd4\u56de\u8be5\u5217\u8868\u4e2d\u5143\u7d20\u7684\u6570\u91cf\u3002\u4f8b\u5982\uff0clen(my_list)<\/code>\u5c06\u8fd4\u56demy_list<\/code>\u7684\u957f\u5ea6\u3002<\/p>\n
                                \u5982\u679c\u5217\u8868\u4e3a\u7a7a\uff0clen()<\/code>\u51fd\u6570\u4f1a\u8fd4\u56de\u4ec0\u4e48\uff1f<\/strong>
                                \u5f53\u5217\u8868\u4e3a\u7a7a\u65f6\uff0clen()<\/code>\u51fd\u6570\u5c06\u8fd4\u56de0\u3002\u8fd9\u610f\u5473\u7740\u5982\u679c\u4f60\u6709\u4e00\u4e2a\u7a7a\u5217\u8868\uff0c\u4f8b\u5982empty_list = []<\/code>\uff0c\u8c03\u7528len(empty_list)<\/code>\u5c06\u5f97\u52300\uff0c\u8868\u660e\u8be5\u5217\u8868\u4e2d\u6ca1\u6709\u4efb\u4f55\u5143\u7d20\u3002<\/p>\n
                                \u9664\u4e86len()<\/code>\u51fd\u6570\uff0c\u8fd8\u6709\u5176\u4ed6\u65b9\u6cd5\u53ef\u4ee5\u68c0\u67e5\u5217\u8868\u7684\u957f\u5ea6\u5417\uff1f<\/strong>
                                \u867d\u7136len()<\/code>\u662f\u6700\u5e38\u7528\u7684\u65b9\u6cd5\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7\u904d\u5386\u5217\u8868\u6765\u8ba1\u7b97\u957f\u5ea6\u3002\u53ef\u4ee5\u4f7f\u7528for<\/code>\u5faa\u73af\u9010\u4e2a\u8ba1\u6570\u5143\u7d20\uff0c\u6216\u8005\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f\u7b49\u65b9\u5f0f\u3002\u8fd9\u4e9b\u65b9\u6cd5\u867d\u7136\u53ef\u4ee5\u5b9e\u73b0\uff0c\u4f46\u6548\u7387\u8f83\u4f4e\uff0clen()<\/code>\u51fd\u6570\u5728\u6027\u80fd\u4e0a\u901a\u5e38\u66f4\u4f18\u3002<\/p>\n
                                \u5217\u8868\u957f\u5ea6\u7684\u53d8\u5316\u4f1a\u5f71\u54cd\u5230\u4ec0\u4e48\uff1f<\/strong>
                                \u5217\u8868\u7684\u957f\u5ea6\u53ef\u4ee5\u5f71\u54cd\u5f88\u591a\u64cd\u4f5c\uff0c\u4f8b\u5982\u5207\u7247\u3001\u7d22\u5f15\u548c\u5faa\u73af\u3002\u5f53\u5217\u8868\u7684\u957f\u5ea6\u53d1\u751f\u53d8\u5316\uff08\u6bd4\u5982\u6dfb\u52a0\u6216\u5220\u9664\u5143\u7d20\u65f6\uff09\uff0c\u5728\u6267\u884c\u8fd9\u4e9b\u64cd\u4f5c\u65f6\u9700\u8981\u6ce8\u610f\u5217\u8868\u7684\u5f53\u524d\u72b6\u6001\uff0c\u4ee5\u907f\u514d\u7d22\u5f15\u8d85\u51fa\u8303\u56f4\u6216\u5176\u4ed6\u6f5c\u5728\u9519\u8bef\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u4f7f\u7528Python\u83b7\u53d6\u5217\u8868\u957f\u5ea6\u7684\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528\u5185\u7f6e\u51fd\u6570len()\u3001\u901a\u8fc7\u8fed\u4ee3\u8ba1\u7b97\u3001\u5229\u7528numpy\u5e93\u7b49\u3002 \u5176\u4e2d\uff0c\u6700\u5e38\u7528 […]","protected":false},"author":3,"featured_media":1120690,"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\/1120680"}],"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=1120680"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1120680\/revisions"}],"predecessor-version":[{"id":1120691,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1120680\/revisions\/1120691"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1120690"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1120680"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1120680"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1120680"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}