{"id":1008271,"date":"2024-12-27T11:01:13","date_gmt":"2024-12-27T03:01:13","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1008271.html"},"modified":"2024-12-27T11:01:16","modified_gmt":"2024-12-27T03:01:16","slug":"python%e5%ad%97%e5%85%b8%e5%a6%82%e4%bd%95%e6%89%93%e5%8d%b0%e9%94%ae","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1008271.html","title":{"rendered":"python\u5b57\u5178\u5982\u4f55\u6253\u5370\u952e"},"content":{"rendered":"

\"python\u5b57\u5178\u5982\u4f55\u6253\u5370\u952e\"<\/p>\n

Python\u5b57\u5178\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u6cd5\u6253\u5370\u952e\uff0c\u5305\u62ec\u4f7f\u7528for\u5faa\u73af\u3001keys()\u65b9\u6cd5\u548clist()\u51fd\u6570\u3002<\/strong> \u5176\u4e2d\uff0c\u4f7f\u7528for<\/code>\u5faa\u73af\u662f\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u4e4b\u4e00\uff0c\u56e0\u4e3a\u5b83\u63d0\u4f9b\u4e86\u66f4\u5927\u7684\u7075\u6d3b\u6027\u548c\u53ef\u8bfb\u6027\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u5e76\u8bf4\u660e\u5b83\u4eec\u7684\u5177\u4f53\u5b9e\u73b0\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528FOR\u5faa\u73af\u6253\u5370\u5b57\u5178\u952e<\/p>\n<\/p>\n

\u4f7f\u7528for<\/code>\u5faa\u73af\u904d\u5386\u5b57\u5178\u662f\u4e00\u79cd\u7b80\u5355\u4e14\u9ad8\u6548\u7684\u65b9\u6cd5\u3002\u901a\u8fc7\u904d\u5386\u5b57\u5178\uff0c\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u6bcf\u4e2a\u952e\uff0c\u5e76\u8fdb\u884c\u76f8\u5173\u64cd\u4f5c\u3002<\/p>\n<\/p>\n

    \n
  1. \u4f7f\u7528FOR\u5faa\u73af\u904d\u5386\u5b57\u5178\u952e<\/li>\n<\/ol>\n

    \u5728Python\u4e2d\uff0c\u5b57\u5178\u662f\u4e00\u79cd\u65e0\u5e8f\u7684\u952e\u503c\u5bf9\u96c6\u5408\u3002\u901a\u8fc7\u4f7f\u7528for<\/code>\u5faa\u73af\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5730\u904d\u5386\u5b57\u5178\u4e2d\u7684\u6240\u6709\u952e\u3002\u8fd9\u79cd\u65b9\u6cd5\u5728\u5904\u7406\u8f83\u5c0f\u7684\u5b57\u5178\u65f6\u5c24\u4e3a\u6709\u6548\u3002<\/p>\n<\/p>\n

    my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
    for key in my_dict:<\/p>\n
        print(key)<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cfor<\/code>\u5faa\u73af\u904d\u5386my_dict<\/code>\u4e2d\u7684\u6bcf\u4e00\u4e2a\u952e\uff0c\u5e76\u4f9d\u6b21\u6253\u5370\u5b83\u4eec\u3002\u8f93\u51fa\u7ed3\u679c\u5c06\u662f\uff1a<\/p>\n<\/p>\n
    name<\/p>\n
    age<\/p>\n
    city<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u52bf\u5728\u4e8e\u5b83\u7684\u7b80\u5355\u6027\u548c\u76f4\u63a5\u6027\uff0c\u540c\u65f6\u4e5f\u5141\u8bb8\u6211\u4eec\u5728\u904d\u5386\u8fc7\u7a0b\u4e2d\u5bf9\u952e\u8fdb\u884c\u8fdb\u4e00\u6b65\u7684\u5904\u7406\u3002<\/p>\n<\/p>\n
      \n
    1. \u589e\u5f3a\u7684FOR\u5faa\u73af\u7528\u6cd5<\/li>\n<\/ol>\n
      \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u5728\u904d\u5386\u952e\u7684\u540c\u65f6\uff0c\u4e5f\u80fd\u8bbf\u95ee\u5bf9\u5e94\u7684\u503c\u3002\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7items()<\/code>\u65b9\u6cd5\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff1a<\/p>\n<\/p>\n
      for key, value in my_dict.items():<\/p>\n
          print(f"Key: {key}, Value: {value}")<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u8fd9\u6837\uff0c\u8f93\u51fa\u7ed3\u679c\u4e0d\u4ec5\u5305\u62ec\u952e\uff0c\u8fd8\u5305\u62ec\u4e86\u6bcf\u4e2a\u952e\u5bf9\u5e94\u7684\u503c\uff1a<\/p>\n<\/p>\n
      Key: name, Value: Alice<\/p>\n
      Key: age, Value: 25<\/p>\n
      Key: city, Value: New York<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u8fd9\u79cd\u65b9\u6cd5\u975e\u5e38\u9002\u5408\u9700\u8981\u540c\u65f6\u64cd\u4f5c\u952e\u548c\u503c\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
      \u4e8c\u3001\u4f7f\u7528KEYS()\u65b9\u6cd5\u6253\u5370\u5b57\u5178\u952e<\/p>\n<\/p>\n
      keys()<\/code>\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u5b57\u5178\u4e2d\u6240\u6709\u952e\u7684\u89c6\u56fe\u5bf9\u8c61\u3002\u8fd9\u4e2a\u89c6\u56fe\u5bf9\u8c61\u53ef\u4ee5\u88ab\u8f6c\u6362\u4e3a\u5217\u8868\uff0c\u4ece\u800c\u65b9\u4fbf\u5730\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
        \n
      1. \u4f7f\u7528KEYS()\u65b9\u6cd5\u83b7\u53d6\u952e<\/li>\n<\/ol>\n
        keys()<\/code>\u65b9\u6cd5\u63d0\u4f9b\u4e86\u4e00\u79cd\u83b7\u53d6\u5b57\u5178\u952e\u7684\u76f4\u63a5\u65b9\u5f0f\u3002\u901a\u8fc7\u5c06\u8fd9\u4e2a\u89c6\u56fe\u5bf9\u8c61\u8f6c\u6362\u4e3a\u5217\u8868\uff0c\u6211\u4eec\u53ef\u4ee5\u66f4\u76f4\u89c2\u5730\u67e5\u770b\u6240\u6709\u952e\u3002<\/p>\n<\/p>\n
        keys = my_dict.keys()<\/p>\n
        print(keys)<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        \u8fd9\u5c06\u8f93\u51fa\uff1a<\/p>\n<\/p>\n
        dict_keys(['name', 'age', 'city'])<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        \u867d\u7136dict_keys<\/code>\u5bf9\u8c61\u672c\u8eab\u4e0d\u662f\u5217\u8868\uff0c\u4f46\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7list()<\/code>\u51fd\u6570\u5c06\u5176\u8f6c\u6362\u4e3a\u5217\u8868\u3002<\/p>\n<\/p>\n
          \n
        1. \u5c06\u89c6\u56fe\u5bf9\u8c61\u8f6c\u6362\u4e3a\u5217\u8868<\/li>\n<\/ol>\n
          \u6709\u65f6\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5bf9\u952e\u8fdb\u884c\u6392\u5e8f\u6216\u5176\u4ed6\u5217\u8868\u64cd\u4f5c\uff0c\u8fd9\u65f6\u53ef\u4ee5\u5c06dict_keys<\/code>\u5bf9\u8c61\u8f6c\u6362\u4e3a\u5217\u8868\uff1a<\/p>\n<\/p>\n
          keys_list = list(my_dict.keys())<\/p>\n
          print(keys_list)<\/p>\n
          <\/code><\/pre>\n<\/p>\n
          \u8f6c\u6362\u540e\u7684\u8f93\u51fa\u4e3a\uff1a<\/p>\n<\/p>\n
          ['name', 'age', 'city']<\/p>\n
          <\/code><\/pre>\n<\/p>\n
          \u8fd9\u79cd\u65b9\u6cd5\u975e\u5e38\u9002\u5408\u9700\u8981\u5bf9\u952e\u8fdb\u884c\u8fdb\u4e00\u6b65\u64cd\u4f5c\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
          \u4e09\u3001\u4f7f\u7528LIST()\u51fd\u6570\u6253\u5370\u5b57\u5178\u952e<\/p>\n<\/p>\n
          list()<\/code>\u51fd\u6570\u53ef\u4ee5\u76f4\u63a5\u5c06\u5b57\u5178\u8f6c\u6362\u4e3a\u5305\u542b\u6240\u6709\u952e\u7684\u5217\u8868\u3002\u8fd9\u79cd\u65b9\u6cd5\u7b80\u5355\u76f4\u63a5\uff0c\u7279\u522b\u9002\u5408\u9700\u8981\u4e00\u6b21\u6027\u83b7\u53d6\u6240\u6709\u952e\u5e76\u8fdb\u884c\u64cd\u4f5c\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n
            \n
          1. \u4f7f\u7528LIST()\u51fd\u6570\u8f6c\u6362\u5b57\u5178\u4e3a\u952e\u5217\u8868<\/li>\n<\/ol>\n
            \u901a\u8fc7list()<\/code>\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u5feb\u901f\u83b7\u53d6\u5b57\u5178\u4e2d\u7684\u6240\u6709\u952e\uff0c\u5e76\u5c06\u5176\u5b58\u50a8\u4e3a\u5217\u8868\u3002<\/p>\n<\/p>\n
            keys_list = list(my_dict)<\/p>\n
            print(keys_list)<\/p>\n
            <\/code><\/pre>\n<\/p>\n
            \u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n<\/p>\n
            ['name', 'age', 'city']<\/p>\n
            <\/code><\/pre>\n<\/p>\n
            \u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u52bf\u5728\u4e8e\u5176\u7b80\u6d01\u6027\uff0c\u9002\u5408\u9700\u8981\u5feb\u901f\u83b7\u53d6\u952e\u5217\u8868\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
              \n
            1. \u7ed3\u5408\u5176\u4ed6\u64cd\u4f5c\u4f7f\u7528LIST()\u51fd\u6570<\/li>\n<\/ol>\n
              \u6709\u65f6\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u7ed3\u5408\u5176\u4ed6\u64cd\u4f5c\u4e00\u8d77\u4f7f\u7528list()<\/code>\u51fd\u6570\uff0c\u4f8b\u5982\u5bf9\u952e\u8fdb\u884c\u6392\u5e8f\uff1a<\/p>\n<\/p>\n
              sorted_keys = sorted(list(my_dict))<\/p>\n
              print(sorted_keys)<\/p>\n
              <\/code><\/pre>\n<\/p>\n
              \u8fd9\u5c06\u8f93\u51fa\uff1a<\/p>\n<\/p>\n
              ['age', 'city', 'name']<\/p>\n
              <\/code><\/pre>\n<\/p>\n
              \u901a\u8fc7\u7ed3\u5408sorted()<\/code>\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5730\u5bf9\u952e\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n<\/p>\n
              \u56db\u3001\u7ed3\u5408\u591a\u79cd\u65b9\u6cd5\u7684\u5b9e\u8df5\u5e94\u7528<\/p>\n<\/p>\n
              \u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u7ed3\u5408\u591a\u79cd\u65b9\u6cd5\u6765\u5904\u7406\u5b57\u5178\u952e\u3002\u4f8b\u5982\uff0c\u5728\u6570\u636e\u5206\u6790\u548c\u5904\u7406\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5bf9\u952e\u8fdb\u884c\u8fc7\u6ee4\u3001\u6392\u5e8f\u548c\u7edf\u8ba1\u7b49\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
                \n
              1. \u8fc7\u6ee4\u5b57\u5178\u952e<\/li>\n<\/ol>\n
                \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u53ea\u5bf9\u67d0\u4e9b\u7279\u5b9a\u7684\u952e\u611f\u5174\u8da3\u3002\u901a\u8fc7\u7ed3\u5408\u6761\u4ef6\u5224\u65ad\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5730\u8fc7\u6ee4\u51fa\u9700\u8981\u7684\u952e\u3002<\/p>\n<\/p>\n
                filtered_keys = [key for key in my_dict if key.startswith('c')]<\/p>\n
                print(filtered_keys)<\/p>\n
                <\/code><\/pre>\n<\/p>\n
                \u8fd9\u5c06\u8f93\u51fa\uff1a<\/p>\n<\/p>\n
                ['city']<\/p>\n
                <\/code><\/pre>\n<\/p>\n
                \u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u5bf9\u5b57\u5178\u952e\u8fdb\u884c\u7b5b\u9009\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
                  \n
                1. \u4f7f\u7528\u952e\u8fdb\u884c\u7edf\u8ba1\u5206\u6790<\/li>\n<\/ol>\n
                  \u5728\u6570\u636e\u5206\u6790\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5bf9\u5b57\u5178\u4e2d\u7684\u952e\u8fdb\u884c\u7edf\u8ba1\u5206\u6790\u3002\u4f8b\u5982\uff0c\u8ba1\u7b97\u4ee5\u67d0\u4e2a\u5b57\u6bcd\u5f00\u5934\u7684\u952e\u7684\u6570\u91cf\uff1a<\/p>\n<\/p>\n
                  count = sum(1 for key in my_dict if key.startswith('a'))<\/p>\n
                  print(count)<\/p>\n
                  <\/code><\/pre>\n<\/p>\n
                  \u8fd9\u5c06\u8f93\u51fa\uff1a<\/p>\n<\/p>\n
                  1<\/p>\n
                  <\/code><\/pre>\n<\/p>\n
                  \u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u5bf9\u5b57\u5178\u952e\u8fdb\u884c\u7edf\u8ba1\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
                  \u901a\u8fc7\u7ed3\u5408\u4f7f\u7528\u4e0a\u8ff0\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u5728Python\u4e2d\u9ad8\u6548\u5730\u6253\u5370\u548c\u64cd\u4f5c\u5b57\u5178\u952e\uff0c\u4ece\u800c\u6ee1\u8db3\u5404\u79cd\u4e0d\u540c\u7684\u5e94\u7528\u9700\u6c42\u3002\u65e0\u8bba\u662f\u7b80\u5355\u7684\u6253\u5370\u4efb\u52a1\uff0c\u8fd8\u662f\u590d\u6742\u7684\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u4efb\u52a1\uff0c\u4e0a\u8ff0\u65b9\u6cd5\u90fd\u80fd\u63d0\u4f9b\u5f3a\u6709\u529b\u7684\u652f\u6301\u3002<\/p>\n<\/p>\n
                  \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
                   \u5982\u4f55\u5728Python\u4e2d\u83b7\u53d6\u5b57\u5178\u7684\u6240\u6709\u952e\uff1f<\/strong>
                  \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528dict.keys()<\/code>\u65b9\u6cd5\u6765\u83b7\u53d6\u5b57\u5178\u7684\u6240\u6709\u952e\u3002\u8fd9\u4e2a\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u6240\u6709\u952e\u7684\u89c6\u56fe\u5bf9\u8c61\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528list()<\/code>\u51fd\u6570\u5c06\u5176\u8f6c\u6362\u4e3a\u5217\u8868\u3002\u4f8b\u5982\uff1a  <\/p>\n
                  my_dict = {'a': 1, 'b': 2, 'c': 3}\nkeys = list(my_dict.keys())\nprint(keys)  # \u8f93\u51fa: ['a', 'b', 'c']\n<\/code><\/pre>\n
                  \u5982\u4f55\u9010\u4e2a\u6253\u5370Python\u5b57\u5178\u4e2d\u7684\u952e\uff1f<\/strong>
                  \u53ef\u4ee5\u4f7f\u7528for<\/code>\u5faa\u73af\u6765\u9010\u4e2a\u6253\u5370\u5b57\u5178\u4e2d\u7684\u6bcf\u4e00\u4e2a\u952e\u3002\u901a\u8fc7\u904d\u5386\u5b57\u5178\u7684\u952e\u89c6\u56fe\uff0c\u53ef\u4ee5\u8f7b\u677e\u5b9e\u73b0\u3002\u4f8b\u5982\uff1a  <\/p>\n
                  my_dict = {'a': 1, 'b': 2, 'c': 3}\nfor key in my_dict:\n    print(key)\n<\/code><\/pre>\n
                  \u4ee5\u4e0a\u4ee3\u7801\u5c06\u9010\u884c\u8f93\u51fa\u5b57\u5178\u4e2d\u7684\u6bcf\u4e2a\u952e\u3002<\/p>\n
                  \u5728\u6253\u5370\u5b57\u5178\u952e\u65f6\uff0c\u5982\u4f55\u786e\u4fdd\u8f93\u51fa\u683c\u5f0f\u6574\u9f50\uff1f<\/strong>
                  \u4e3a\u4e86\u786e\u4fdd\u6253\u5370\u8f93\u51fa\u683c\u5f0f\u6574\u9f50\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u529f\u80fd\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528f-string<\/code>\u6216format()<\/code>\u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a  <\/p>\n
                  my_dict = {'a': 1, 'b': 2, 'c': 3}\nfor key in my_dict:\n    print(f'\u952e: {key}')\n<\/code><\/pre>\n
                  \u8fd9\u79cd\u65b9\u5f0f\u53ef\u4ee5\u8ba9\u4f60\u5728\u6253\u5370\u65f6\u81ea\u5b9a\u4e49\u8f93\u51fa\u5185\u5bb9\uff0c\u589e\u52a0\u53ef\u8bfb\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u5b57\u5178\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u6cd5\u6253\u5370\u952e\uff0c\u5305\u62ec\u4f7f\u7528for\u5faa\u73af\u3001keys()\u65b9\u6cd5\u548clist()\u51fd\u6570\u3002 \u5176\u4e2d\uff0c\u4f7f\u7528f […]","protected":false},"author":3,"featured_media":1008281,"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\/1008271"}],"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=1008271"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1008271\/revisions"}],"predecessor-version":[{"id":1008282,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1008271\/revisions\/1008282"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1008281"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1008271"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1008271"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1008271"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}