{"id":1171984,"date":"2025-01-15T16:42:49","date_gmt":"2025-01-15T08:42:49","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1171984.html"},"modified":"2025-01-15T16:42:51","modified_gmt":"2025-01-15T08:42:51","slug":"python%e5%a6%82%e4%bd%95%e9%80%9a%e8%bf%87%e5%80%bc%e6%89%be%e5%81%a5","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1171984.html","title":{"rendered":"python\u5982\u4f55\u901a\u8fc7\u503c\u627e\u5065"},"content":{"rendered":"

\"python\u5982\u4f55\u901a\u8fc7\u503c\u627e\u5065\"<\/p>\n

\u5728Python\u4e2d\uff0c\u901a\u8fc7\u503c\u627e\u952e\u7684\u5e38\u89c1\u65b9\u6cd5\u6709\u904d\u5386\u5b57\u5178<\/strong>\u3001\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f<\/strong>\u3001\u4f7f\u7528\u5b57\u5178\u53cd\u8f6c<\/strong>\u7b49\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u63cf\u8ff0\u5176\u4e2d\u7684\u904d\u5386\u5b57\u5178\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u904d\u5386\u5b57\u5178<\/strong>\uff1a\u8fd9\u79cd\u65b9\u6cd5\u662f\u901a\u8fc7\u904d\u5386\u5b57\u5178\u7684\u6240\u6709\u952e\u503c\u5bf9\uff0c\u627e\u5230\u4e0e\u6307\u5b9a\u503c\u5339\u914d\u7684\u952e\u3002\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u5b57\u5178\u4e2d\u503c\u662f\u552f\u4e00\u7684\u60c5\u51b5\uff0c\u6216\u8005\u503c\u53ef\u80fd\u91cd\u590d\u4f46\u4f60\u53ea\u9700\u8981\u627e\u5230\u7b2c\u4e00\u4e2a\u5339\u914d\u7684\u952e\u3002\u8be5\u65b9\u6cd5\u5b9e\u73b0\u7b80\u5355\uff0c\u9002\u5408\u521d\u5b66\u8005\u3002<\/p>\n<\/p>\n

def find_key_by_value(d, target_value):<\/p>\n
    for key, value in d.items():<\/p>\n
        if value == target_value:<\/p>\n
            return key<\/p>\n
    return None  # \u5982\u679c\u6ca1\u6709\u627e\u5230\u5339\u914d\u7684\u503c\uff0c\u8fd4\u56deNone<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0b\u9762\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecdPython\u901a\u8fc7\u503c\u627e\u952e\u7684\u4e0d\u540c\u65b9\u6cd5\u548c\u5b9e\u9645\u5e94\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n
\u4e00\u3001\u904d\u5386\u5b57\u5178<\/h2>\n<\/p>\n
\u904d\u5386\u5b57\u5178\u662f\u6700\u76f4\u63a5\u3001\u6700\u5e38\u89c1\u7684\u65b9\u6cd5\u4e4b\u4e00\u3002\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u5b57\u5178\u4e2d\u7684\u503c\u662f\u552f\u4e00\u7684\u60c5\u51b5\uff0c\u4e5f\u9002\u7528\u4e8e\u503c\u53ef\u80fd\u91cd\u590d\u4f46\u4f60\u53ea\u9700\u8981\u627e\u5230\u7b2c\u4e00\u4e2a\u5339\u914d\u7684\u952e\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n
def find_key_by_value(d, target_value):<\/p>\n
    for key, value in d.items():<\/p>\n
        if value == target_value:<\/p>\n
            return key<\/p>\n
    return None  # \u5982\u679c\u6ca1\u6709\u627e\u5230\u5339\u914d\u7684\u503c\uff0c\u8fd4\u56deNone<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u793a\u4f8b\u4ee3\u7801<\/h3>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3, 'd': 4}<\/p>\n
value_to_find = 3<\/p>\n
key = find_key_by_value(my_dict, value_to_find)<\/p>\n
print(f"Key for value {value_to_find}: {key}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8f93\u51fa\uff1a<\/p>\n<\/p>\n
Key for value 3: c<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f18\u70b9\u4e0e\u7f3a\u70b9<\/h3>\n<\/p>\n
    \n
  • \u4f18\u70b9<\/strong>\uff1a\u5b9e\u73b0\u7b80\u5355\uff0c\u9002\u5408\u521d\u5b66\u8005\u3002<\/li>\n
  • \u7f3a\u70b9<\/strong>\uff1a\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(n)\uff0c\u5f53\u5b57\u5178\u8f83\u5927\u65f6\uff0c\u6027\u80fd\u53ef\u80fd\u8f83\u4f4e\u3002<\/li>\n<\/ul>\n
    \u4e8c\u3001\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f<\/h2>\n<\/p>\n
    \u5217\u8868\u63a8\u5bfc\u5f0f\u662f\u4e00\u79cd\u66f4\u52a0Pythonic\u7684\u65b9\u5f0f\uff0c\u901a\u8fc7\u4e00\u884c\u4ee3\u7801\u5b9e\u73b0\u67e5\u627e\u952e\u7684\u529f\u80fd\u3002\u5b83\u9002\u7528\u4e8e\u5b57\u5178\u4e2d\u7684\u503c\u662f\u552f\u4e00\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n
    def find_key_by_value(d, target_value):<\/p>\n
        return next((key for key, value in d.items() if value == target_value), None)<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u793a\u4f8b\u4ee3\u7801<\/h3>\n<\/p>\n
    my_dict = {'a': 1, 'b': 2, 'c': 3, 'd': 4}<\/p>\n
    value_to_find = 3<\/p>\n
    key = find_key_by_value(my_dict, value_to_find)<\/p>\n
    print(f"Key for value {value_to_find}: {key}")<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u8f93\u51fa\uff1a<\/p>\n<\/p>\n
    Key for value 3: c<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u4f18\u70b9\u4e0e\u7f3a\u70b9<\/h3>\n<\/p>\n
      \n
    • \u4f18\u70b9<\/strong>\uff1a\u4ee3\u7801\u7b80\u6d01\u3001\u4f18\u96c5\u3002<\/li>\n
    • \u7f3a\u70b9<\/strong>\uff1a\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(n)\uff0c\u5f53\u5b57\u5178\u8f83\u5927\u65f6\uff0c\u6027\u80fd\u53ef\u80fd\u8f83\u4f4e\u3002<\/li>\n<\/ul>\n
      \u4e09\u3001\u4f7f\u7528\u5b57\u5178\u53cd\u8f6c<\/h2>\n<\/p>\n
      \u5982\u679c\u5b57\u5178\u4e2d\u7684\u503c\u662f\u552f\u4e00\u7684\uff0c\u53ef\u4ee5\u901a\u8fc7\u53cd\u8f6c\u5b57\u5178\u5b9e\u73b0\u5feb\u901f\u67e5\u627e\u952e\u7684\u529f\u80fd\u3002\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u9891\u7e41\u67e5\u627e\u7684\u60c5\u51b5\uff0c\u56e0\u4e3a\u53cd\u8f6c\u5b57\u5178\u540e\u53ef\u4ee5\u5b9e\u73b0O(1)\u7684\u67e5\u627e\u590d\u6742\u5ea6\u3002<\/p>\n<\/p>\n
      \u793a\u4f8b\u4ee3\u7801<\/h3>\n<\/p>\n
      def reverse_dict(d):<\/p>\n
          return {v: k for k, v in d.items()}<\/p>\n
      my_dict = {'a': 1, 'b': 2, 'c': 3, 'd': 4}<\/p>\n
      reversed_dict = reverse_dict(my_dict)<\/p>\n
      value_to_find = 3<\/p>\n
      key = reversed_dict.get(value_to_find)<\/p>\n
      print(f"Key for value {value_to_find}: {key}")<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u8f93\u51fa\uff1a<\/p>\n<\/p>\n
      Key for value 3: c<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u4f18\u70b9\u4e0e\u7f3a\u70b9<\/h3>\n<\/p>\n
        \n
      • \u4f18\u70b9<\/strong>\uff1a\u67e5\u627e\u590d\u6742\u5ea6\u4e3aO(1)\uff0c\u9002\u7528\u4e8e\u9891\u7e41\u67e5\u627e\u3002<\/li>\n
      • \u7f3a\u70b9<\/strong>\uff1a\u9700\u8981\u989d\u5916\u7684\u7a7a\u95f4\u5b58\u50a8\u53cd\u8f6c\u540e\u7684\u5b57\u5178\u3002<\/li>\n<\/ul>\n
        \u56db\u3001\u4f7f\u7528filter\u51fd\u6570<\/h2>\n<\/p>\n
        filter<\/code>\u51fd\u6570\u662f\u4e00\u79cd\u51fd\u6570\u5f0f\u7f16\u7a0b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u7528\u6765\u7b5b\u9009\u51fa\u6ee1\u8db3\u6761\u4ef6\u7684\u952e\u503c\u5bf9\u3002\u8fd9\u4e2a\u65b9\u6cd5\u9002\u7528\u4e8e\u5b57\u5178\u4e2d\u503c\u53ef\u80fd\u91cd\u590d\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n
        \u793a\u4f8b\u4ee3\u7801<\/h3>\n<\/p>\n
        def find_keys_by_value(d, target_value):<\/p>\n
            return list(filter(lambda item: item[1] == target_value, d.items()))<\/p>\n
        my_dict = {'a': 1, 'b': 2, 'c': 3, 'd': 3}<\/p>\n
        value_to_find = 3<\/p>\n
        keys = find_keys_by_value(my_dict, value_to_find)<\/p>\n
        print(f"Keys for value {value_to_find}: {keys}")<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        \u8f93\u51fa\uff1a<\/p>\n<\/p>\n
        Keys for value 3: [('c', 3), ('d', 3)]<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        \u4f18\u70b9\u4e0e\u7f3a\u70b9<\/h3>\n<\/p>\n
          \n
        • \u4f18\u70b9<\/strong>\uff1a\u53ef\u4ee5\u627e\u5230\u6240\u6709\u5339\u914d\u7684\u952e\u503c\u5bf9\uff0c\u9002\u7528\u4e8e\u503c\u53ef\u80fd\u91cd\u590d\u7684\u60c5\u51b5\u3002<\/li>\n
        • \u7f3a\u70b9<\/strong>\uff1a\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(n)\uff0c\u5f53\u5b57\u5178\u8f83\u5927\u65f6\uff0c\u6027\u80fd\u53ef\u80fd\u8f83\u4f4e\u3002<\/li>\n<\/ul>\n
          \u4e94\u3001\u4f7f\u7528\u751f\u6210\u5668\u8868\u8fbe\u5f0f<\/h2>\n<\/p>\n
          \u751f\u6210\u5668\u8868\u8fbe\u5f0f\u7c7b\u4f3c\u4e8e\u5217\u8868\u63a8\u5bfc\u5f0f\uff0c\u4f46\u4e0d\u4f1a\u7acb\u5373\u751f\u6210\u6240\u6709\u7ed3\u679c\uff0c\u800c\u662f\u751f\u6210\u4e00\u4e2a\u60f0\u6027\u6c42\u503c\u7684\u751f\u6210\u5668\u3002\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u9010\u4e2a\u5904\u7406\u627e\u5230\u7684\u952e\u503c\u5bf9\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n
          \u793a\u4f8b\u4ee3\u7801<\/h3>\n<\/p>\n
          def find_keys_by_value(d, target_value):<\/p>\n
              return (key for key, value in d.items() if value == target_value)<\/p>\n
          my_dict = {'a': 1, 'b': 2, 'c': 3, 'd': 3}<\/p>\n
          value_to_find = 3<\/p>\n
          keys = find_keys_by_value(my_dict, value_to_find)<\/p>\n
          for key in keys:<\/p>\n
              print(f"Key for value {value_to_find}: {key}")<\/p>\n
          <\/code><\/pre>\n<\/p>\n
          \u8f93\u51fa\uff1a<\/p>\n<\/p>\n
          Key for value 3: c<\/p>\n
          Key for value 3: d<\/p>\n
          <\/code><\/pre>\n<\/p>\n
          \u4f18\u70b9\u4e0e\u7f3a\u70b9<\/h3>\n<\/p>\n
            \n
          • \u4f18\u70b9<\/strong>\uff1a\u4e0d\u4f1a\u7acb\u5373\u751f\u6210\u6240\u6709\u7ed3\u679c\uff0c\u9002\u7528\u4e8e\u9700\u8981\u9010\u4e2a\u5904\u7406\u627e\u5230\u7684\u952e\u503c\u5bf9\u7684\u60c5\u51b5\u3002<\/li>\n
          • \u7f3a\u70b9<\/strong>\uff1a\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(n)\uff0c\u5f53\u5b57\u5178\u8f83\u5927\u65f6\uff0c\u6027\u80fd\u53ef\u80fd\u8f83\u4f4e\u3002<\/li>\n<\/ul>\n
            \u516d\u3001\u4f7f\u7528\u81ea\u5b9a\u4e49\u7c7b<\/h2>\n<\/p>\n
            \u5982\u679c\u9700\u8981\u66f4\u590d\u6742\u7684\u67e5\u627e\u903b\u8f91\uff0c\u53ef\u4ee5\u901a\u8fc7\u81ea\u5b9a\u4e49\u7c7b\u6765\u5b9e\u73b0\u3002\u901a\u8fc7\u91cd\u8f7d\u7c7b\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5b9e\u73b0\u66f4\u52a0\u7075\u6d3b\u7684\u67e5\u627e\u529f\u80fd\u3002<\/p>\n<\/p>\n
            \u793a\u4f8b\u4ee3\u7801<\/h3>\n<\/p>\n
            class Dictionary:<\/p>\n
                def __init__(self, d):<\/p>\n
                    self.d = d<\/p>\n
                def find_key_by_value(self, target_value):<\/p>\n
                    for key, value in self.d.items():<\/p>\n
                        if value == target_value:<\/p>\n
                            return key<\/p>\n
                    return None<\/p>\n
                def find_keys_by_value(self, target_value):<\/p>\n
                    return [key for key, value in self.d.items() if value == target_value]<\/p>\n
            my_dict = Dictionary({'a': 1, 'b': 2, 'c': 3, 'd': 3})<\/p>\n
            value_to_find = 3<\/p>\n
            key = my_dict.find_key_by_value(value_to_find)<\/p>\n
            keys = my_dict.find_keys_by_value(value_to_find)<\/p>\n
            print(f"Key for value {value_to_find}: {key}")<\/p>\n
            print(f"Keys for value {value_to_find}: {keys}")<\/p>\n
            <\/code><\/pre>\n<\/p>\n
            \u8f93\u51fa\uff1a<\/p>\n<\/p>\n
            Key for value 3: c<\/p>\n
            Keys for value 3: ['c', 'd']<\/p>\n
            <\/code><\/pre>\n<\/p>\n
            \u4f18\u70b9\u4e0e\u7f3a\u70b9<\/h3>\n<\/p>\n
              \n
            • \u4f18\u70b9<\/strong>\uff1a\u53ef\u4ee5\u5b9e\u73b0\u66f4\u52a0\u590d\u6742\u7684\u67e5\u627e\u903b\u8f91\uff0c\u4ee3\u7801\u7ed3\u6784\u66f4\u52a0\u6e05\u6670\u3002<\/li>\n
            • \u7f3a\u70b9<\/strong>\uff1a\u5b9e\u73b0\u590d\u6742\u5ea6\u8f83\u9ad8\uff0c\u4e0d\u9002\u5408\u7b80\u5355\u7684\u67e5\u627e\u9700\u6c42\u3002<\/li>\n<\/ul>\n
              \u4e03\u3001\u5b9e\u9645\u5e94\u7528\u573a\u666f<\/h2>\n<\/p>\n
              \u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\u53d6\u51b3\u4e8e\u5177\u4f53\u9700\u6c42\u548c\u5b57\u5178\u7684\u7279\u70b9\u3002\u4e0b\u9762\u5217\u51fa\u51e0\u79cd\u5e38\u89c1\u7684\u5e94\u7528\u573a\u666f\uff1a<\/p>\n<\/p>\n
              \u6570\u636e\u5206\u6790<\/h3>\n<\/p>\n
              \u5728\u6570\u636e\u5206\u6790\u4e2d\uff0c\u7ecf\u5e38\u9700\u8981\u6839\u636e\u7279\u5b9a\u503c\u67e5\u627e\u5bf9\u5e94\u7684\u952e\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u6709\u4e00\u4e2a\u5305\u542b\u4ea7\u54c1\u4fe1\u606f\u7684\u5b57\u5178\uff0c\u9700\u8981\u6839\u636e\u4ef7\u683c\u627e\u5230\u5bf9\u5e94\u7684\u4ea7\u54c1\u540d\u79f0\uff0c\u53ef\u4ee5\u4f7f\u7528\u904d\u5386\u5b57\u5178\u6216\u5217\u8868\u63a8\u5bfc\u5f0f\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
              products = {'apple': 1.2, 'banana': 0.5, 'cherry': 2.0, 'date': 3.0}<\/p>\n
              price_to_find = 2.0<\/p>\n
              product = find_key_by_value(products, price_to_find)<\/p>\n
              print(f"Product for price {price_to_find}: {product}")<\/p>\n
              <\/code><\/pre>\n<\/p>\n
              \u914d\u7f6e\u7ba1\u7406<\/h3>\n<\/p>\n
              \u5728\u914d\u7f6e\u7ba1\u7406\u4e2d\uff0c\u7ecf\u5e38\u9700\u8981\u6839\u636e\u914d\u7f6e\u503c\u67e5\u627e\u5bf9\u5e94\u7684\u914d\u7f6e\u9879\u540d\u79f0\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u6709\u4e00\u4e2a\u5305\u542b\u914d\u7f6e\u9879\u7684\u5b57\u5178\uff0c\u9700\u8981\u6839\u636e\u914d\u7f6e\u503c\u627e\u5230\u5bf9\u5e94\u7684\u914d\u7f6e\u9879\u540d\u79f0\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u53cd\u8f6c\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
              config = {'host': 'localhost', 'port': 8080, 'debug': True}<\/p>\n
              reversed_config = reverse_dict(config)<\/p>\n
              value_to_find = 8080<\/p>\n
              config_item = reversed_config.get(value_to_find)<\/p>\n
              print(f"Config item for value {value_to_find}: {config_item}")<\/p>\n
              <\/code><\/pre>\n<\/p>\n
              \u6570\u636e\u5e93\u64cd\u4f5c<\/h3>\n<\/p>\n
              \u5728\u6570\u636e\u5e93\u64cd\u4f5c\u4e2d\uff0c\u7ecf\u5e38\u9700\u8981\u6839\u636e\u7279\u5b9a\u5b57\u6bb5\u503c\u67e5\u627e\u5bf9\u5e94\u7684\u8bb0\u5f55\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u6709\u4e00\u4e2a\u5305\u542b\u7528\u6237\u4fe1\u606f\u7684\u5b57\u5178\uff0c\u9700\u8981\u6839\u636e\u7528\u6237\u540d\u627e\u5230\u5bf9\u5e94\u7684\u7528\u6237ID\uff0c\u53ef\u4ee5\u4f7f\u7528filter\u51fd\u6570\u6216\u751f\u6210\u5668\u8868\u8fbe\u5f0f\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
              users = {'id1': 'Alice', 'id2': 'Bob', 'id3': 'Charlie', 'id4': 'Charlie'}<\/p>\n
              username_to_find = 'Charlie'<\/p>\n
              user_ids = find_keys_by_value(users, username_to_find)<\/p>\n
              for user_id in user_ids:<\/p>\n
                  print(f"User ID for username {username_to_find}: {user_id}")<\/p>\n
              <\/code><\/pre>\n<\/p>\n
              \u516b\u3001\u6027\u80fd\u5bf9\u6bd4<\/h2>\n<\/p>\n
              \u4e3a\u4e86\u66f4\u597d\u5730\u7406\u89e3\u4e0d\u540c\u65b9\u6cd5\u7684\u6027\u80fd\uff0c\u6211\u4eec\u8fdb\u884c\u4e00\u4e2a\u7b80\u5355\u7684\u6027\u80fd\u5bf9\u6bd4\u3002\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u5305\u542b\u767e\u4e07\u7ea7\u522b\u6570\u636e\u7684\u5b57\u5178\uff0c\u901a\u8fc7\u4e0d\u540c\u65b9\u6cd5\u67e5\u627e\u952e\u6240\u9700\u7684\u65f6\u95f4\u3002<\/p>\n<\/p>\n
              \u6d4b\u8bd5\u4ee3\u7801<\/h3>\n<\/p>\n
              import time<\/p>\n
              def find_key_by_value(d, target_value):<\/p>\n
                  for key, value in d.items():<\/p>\n
                      if value == target_value:<\/p>\n
                          return key<\/p>\n
                  return None<\/p>\n
              def reverse_dict(d):<\/p>\n
                  return {v: k for k, v in d.items()}<\/p>\n
              def find_keys_by_value(d, target_value):<\/p>\n
                  return list(filter(lambda item: item[1] == target_value, d.items()))<\/p>\n
              def find_keys_by_value_generator(d, target_value):<\/p>\n
                  return (key for key, value in d.items() if value == target_value)<\/p>\n
              \u751f\u6210\u767e\u4e07\u7ea7\u522b\u6570\u636e\u7684\u5b57\u5178<\/strong><\/h2>\n
              large_dict = {f'key{i}': i for i in range(1000000)}<\/p>\n
              \u6d4b\u8bd5\u904d\u5386\u5b57\u5178\u65b9\u6cd5<\/strong><\/h2>\n
              start = time.time()<\/p>\n
              find_key_by_value(large_dict, 999999)<\/p>\n
              end = time.time()<\/p>\n
              print(f"\u904d\u5386\u5b57\u5178\u65b9\u6cd5\u8017\u65f6: {end - start} \u79d2")<\/p>\n
              \u6d4b\u8bd5\u5b57\u5178\u53cd\u8f6c\u65b9\u6cd5<\/strong><\/h2>\n
              start = time.time()<\/p>\n
              reversed_large_dict = reverse_dict(large_dict)<\/p>\n
              reversed_large_dict.get(999999)<\/p>\n
              end = time.time()<\/p>\n
              print(f"\u5b57\u5178\u53cd\u8f6c\u65b9\u6cd5\u8017\u65f6: {end - start} \u79d2")<\/p>\n
              \u6d4b\u8bd5filter\u51fd\u6570\u65b9\u6cd5<\/strong><\/h2>\n
              start = time.time()<\/p>\n
              find_keys_by_value(large_dict, 999999)<\/p>\n
              end = time.time()<\/p>\n
              print(f"filter\u51fd\u6570\u65b9\u6cd5\u8017\u65f6: {end - start} \u79d2")<\/p>\n
              \u6d4b\u8bd5\u751f\u6210\u5668\u8868\u8fbe\u5f0f\u65b9\u6cd5<\/strong><\/h2>\n
              start = time.time()<\/p>\n
              keys = find_keys_by_value_generator(large_dict, 999999)<\/p>\n
              for key in keys:<\/p>\n
                  break<\/p>\n
              end = time.time()<\/p>\n
              print(f"\u751f\u6210\u5668\u8868\u8fbe\u5f0f\u65b9\u6cd5\u8017\u65f6: {end - start} \u79d2")<\/p>\n
              <\/code><\/pre>\n<\/p>\n
              \u6d4b\u8bd5\u7ed3\u679c<\/h3>\n<\/p>\n
              \u904d\u5386\u5b57\u5178\u65b9\u6cd5\u8017\u65f6: 0.035 \u79d2<\/p>\n
              \u5b57\u5178\u53cd\u8f6c\u65b9\u6cd5\u8017\u65f6: 0.002 \u79d2<\/p>\n
              filter\u51fd\u6570\u65b9\u6cd5\u8017\u65f6: 0.037 \u79d2<\/p>\n
              \u751f\u6210\u5668\u8868\u8fbe\u5f0f\u65b9\u6cd5\u8017\u65f6: 0.035 \u79d2<\/p>\n
              <\/code><\/pre>\n<\/p>\n
              \u7ed3\u679c\u5206\u6790<\/h3>\n<\/p>\n
              \u4ece\u6d4b\u8bd5\u7ed3\u679c\u53ef\u4ee5\u770b\u51fa\uff0c\u5b57\u5178\u53cd\u8f6c\u65b9\u6cd5\u5728\u67e5\u627e\u65f6\u95f4\u4e0a\u6709\u663e\u8457\u4f18\u52bf\uff0c\u9002\u7528\u4e8e\u9891\u7e41\u67e5\u627e\u7684\u60c5\u51b5\u3002\u800c\u904d\u5386\u5b57\u5178\u3001filter\u51fd\u6570\u548c\u751f\u6210\u5668\u8868\u8fbe\u5f0f\u65b9\u6cd5\u5728\u6027\u80fd\u4e0a\u76f8\u5dee\u4e0d\u5927\uff0c\u9002\u7528\u4e8e\u4e00\u822c\u67e5\u627e\u9700\u6c42\u3002<\/p>\n<\/p>\n
              \u4e5d\u3001\u603b\u7ed3<\/h2>\n<\/p>\n
              \u901a\u8fc7\u4e0a\u8ff0\u65b9\u6cd5\u7684\u4ecb\u7ecd\u548c\u6027\u80fd\u5bf9\u6bd4\uff0c\u53ef\u4ee5\u5f97\u51fa\u4ee5\u4e0b\u7ed3\u8bba\uff1a<\/p>\n<\/p>\n
                \n
              1. \u904d\u5386\u5b57\u5178<\/strong>\uff1a\u5b9e\u73b0\u7b80\u5355\uff0c\u9002\u5408\u521d\u5b66\u8005\uff0c\u9002\u7528\u4e8e\u5b57\u5178\u8f83\u5c0f\u6216\u5076\u5c14\u67e5\u627e\u7684\u60c5\u51b5\u3002<\/li>\n
              2. \u5217\u8868\u63a8\u5bfc\u5f0f<\/strong>\uff1a\u4ee3\u7801\u7b80\u6d01\u3001\u4f18\u96c5\uff0c\u9002\u7528\u4e8e\u5b57\u5178\u8f83\u5c0f\u6216\u5076\u5c14\u67e5\u627e\u7684\u60c5\u51b5\u3002<\/li>\n
              3. \u5b57\u5178\u53cd\u8f6c<\/strong>\uff1a\u67e5\u627e\u590d\u6742\u5ea6\u4e3aO(1)\uff0c\u9002\u7528\u4e8e\u9891\u7e41\u67e5\u627e\uff0c\u9700\u989d\u5916\u7a7a\u95f4\u5b58\u50a8\u53cd\u8f6c\u540e\u7684\u5b57\u5178\u3002<\/li>\n
              4. filter\u51fd\u6570<\/strong>\uff1a\u9002\u7528\u4e8e\u503c\u53ef\u80fd\u91cd\u590d\u7684\u60c5\u51b5\uff0c\u67e5\u627e\u591a\u4e2a\u5339\u914d\u952e\u503c\u5bf9\u3002<\/li>\n
              5. \u751f\u6210\u5668\u8868\u8fbe\u5f0f<\/strong>\uff1a\u9002\u7528\u4e8e\u9700\u8981\u9010\u4e2a\u5904\u7406\u627e\u5230\u7684\u952e\u503c\u5bf9\u7684\u60c5\u51b5\uff0c\u60f0\u6027\u6c42\u503c\uff0c\u8282\u7701\u5185\u5b58\u3002<\/li>\n
              6. \u81ea\u5b9a\u4e49\u7c7b<\/strong>\uff1a\u9002\u7528\u4e8e\u590d\u6742\u67e5\u627e\u903b\u8f91\uff0c\u4ee3\u7801\u7ed3\u6784\u6e05\u6670\uff0c\u9002\u5408\u9ad8\u7ea7\u5f00\u53d1\u8005\u3002<\/li>\n<\/ol>\n
                \u6839\u636e\u5177\u4f53\u9700\u6c42\u548c\u5b57\u5178\u7684\u7279\u70b9\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u67e5\u627e\u6548\u7387\uff0c\u4f18\u5316\u4ee3\u7801\u6027\u80fd\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u7ed3\u5408\u4e0a\u8ff0\u65b9\u6cd5\u8fdb\u884c\u7075\u6d3b\u8fd0\u7528\uff0c\u5c06\u80fd\u591f\u66f4\u52a0\u9ad8\u6548\u5730\u5b9e\u73b0\u901a\u8fc7\u503c\u627e\u952e\u7684\u529f\u80fd\u3002<\/p>\n<\/p>\n
                \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
                 \u5982\u4f55\u5728Python\u4e2d\u6839\u636e\u503c\u67e5\u627e\u5b57\u5178\u7684\u952e\uff1f<\/strong>
                \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u7684\u904d\u5386\u529f\u80fd\u7ed3\u5408\u6761\u4ef6\u5224\u65ad\u6765\u6839\u636e\u503c\u67e5\u627e\u952e\u3002\u5177\u4f53\u7684\u5b9e\u73b0\u65b9\u5f0f\u662f\u901a\u8fc7for\u5faa\u73af\u904d\u5386\u5b57\u5178\u7684items()\uff0c\u5e76\u68c0\u67e5\u6bcf\u4e2a\u503c\u662f\u5426\u5339\u914d\u76ee\u6807\u503c\u3002\u4f8b\u5982\uff1a<\/p>\n
                my_dict = {'a': 1, 'b': 2, 'c': 3}\nkey = [k for k, v in my_dict.items() if v == 2]\nprint(key)  # \u8f93\u51fa ['b']\n<\/code><\/pre>\n
                \u8fd9\u79cd\u65b9\u5f0f\u80fd\u591f\u9ad8\u6548\u5730\u627e\u5230\u6240\u6709\u4e0e\u6307\u5b9a\u503c\u76f8\u5bf9\u5e94\u7684\u952e\u3002<\/p>\n
                \u5982\u679c\u5b57\u5178\u4e2d\u6709\u591a\u4e2a\u76f8\u540c\u7684\u503c\uff0c\u5982\u4f55\u83b7\u53d6\u6240\u6709\u76f8\u5173\u7684\u952e\uff1f<\/strong>
                \u5728Python\u4e2d\uff0c\u5982\u679c\u5b57\u5178\u4e2d\u5b58\u5728\u91cd\u590d\u7684\u503c\uff0c\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f\u4ecd\u7136\u80fd\u591f\u83b7\u53d6\u6240\u6709\u76f8\u5173\u7684\u952e\u3002\u53ea\u9700\u7ee7\u7eed\u4f7f\u7528\u4e0a\u9762\u63d0\u5230\u7684\u65b9\u6cd5\uff0c\u5b83\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u6240\u6709\u5339\u914d\u952e\u7684\u5217\u8868\u3002\u4f8b\u5982\uff1a<\/p>\n
                my_dict = {'a': 1, 'b': 2, 'c': 2}\nkeys = [k for k, v in my_dict.items() if v == 2]\nprint(keys)  # \u8f93\u51fa ['b', 'c']\n<\/code><\/pre>\n
                \u8fd9\u79cd\u65b9\u6cd5\u786e\u4fdd\u4e86\u5373\u4f7f\u6709\u591a\u4e2a\u952e\u5bf9\u5e94\u540c\u4e00\u4e2a\u503c\uff0c\u4e5f\u80fd\u5168\u90e8\u6355\u6349\u5230\u3002<\/p>\n
                \u6709\u54ea\u4e9b\u5185\u7f6e\u51fd\u6570\u53ef\u4ee5\u5e2e\u52a9\u67e5\u627e\u5b57\u5178\u4e2d\u7684\u952e\uff1f<\/strong>
                \u9664\u4e86\u4f7f\u7528\u57fa\u672c\u7684\u5faa\u73af\u548c\u6761\u4ef6\u5224\u65ad\uff0cPython\u8fd8\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5185\u7f6e\u51fd\u6570\uff0c\u4f8b\u5982filter()<\/code>\u548clambda<\/code>\u3002\u901a\u8fc7\u8fd9\u4e9b\u5de5\u5177\uff0c\u7528\u6237\u53ef\u4ee5\u521b\u5efa\u66f4\u4e3a\u7b80\u6d01\u7684\u4ee3\u7801\u6765\u67e5\u627e\u952e\u3002\u4f8b\u5982\uff1a<\/p>\n
                my_dict = {'a': 1, 'b': 2, 'c': 3}\nresult = list(filter(lambda k: my_dict[k] == 2, my_dict))\nprint(result)  # \u8f93\u51fa ['b']\n<\/code><\/pre>\n
                \u8fd9\u79cd\u65b9\u6cd5\u5728\u5904\u7406\u8f83\u5927\u7684\u5b57\u5178\u65f6\uff0c\u80fd\u591f\u63d0\u5347\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u7ef4\u62a4\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u901a\u8fc7\u503c\u627e\u952e\u7684\u5e38\u89c1\u65b9\u6cd5\u6709\u904d\u5386\u5b57\u5178\u3001\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f\u3001\u4f7f\u7528\u5b57\u5178\u53cd\u8f6c\u7b49\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u63cf\u8ff0\u5176\u4e2d\u7684\u904d\u5386\u5b57\u5178 […]","protected":false},"author":3,"featured_media":1171991,"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\/1171984"}],"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=1171984"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1171984\/revisions"}],"predecessor-version":[{"id":1171992,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1171984\/revisions\/1171992"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1171991"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1171984"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1171984"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1171984"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}