{"id":950125,"date":"2024-12-27T00:25:53","date_gmt":"2024-12-26T16:25:53","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/950125.html"},"modified":"2024-12-27T00:25:55","modified_gmt":"2024-12-26T16:25:55","slug":"python%e5%a6%82%e4%bd%95%e7%94%a8value","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/950125.html","title":{"rendered":"python\u5982\u4f55\u7528value"},"content":{"rendered":"

\"python\u5982\u4f55\u7528value\"<\/p>\n

\u5728Python\u4e2d\uff0c\u4f7f\u7528value\u7684\u65b9\u5f0f\u5305\u62ec\uff1a\u5b57\u5178\u4e2d\u7684\u952e\u503c\u5bf9\u3001\u53d8\u91cf\u8d4b\u503c\u3001\u51fd\u6570\u53c2\u6570\u4f20\u9012\u3002<\/strong> \u5b57\u5178\u662fPython\u4e2d\u4e00\u79cd\u5e38\u89c1\u7684\u6570\u636e\u7ed3\u6784\uff0c\u53ef\u4ee5\u901a\u8fc7\u952e\uff08key\uff09\u6765\u83b7\u53d6\u5bf9\u5e94\u7684\u503c\uff08value\uff09\u3002\u53d8\u91cf\u8d4b\u503c\u662fPython\u4e2d\u6700\u57fa\u672c\u7684\u64cd\u4f5c\u4e4b\u4e00\uff0c\u8868\u793a\u5c06\u67d0\u4e2a\u503c\u5b58\u50a8\u5230\u53d8\u91cf\u4e2d\uff0c\u4ee5\u4fbf\u540e\u7eed\u4f7f\u7528\u3002\u51fd\u6570\u53c2\u6570\u4f20\u9012\u662f\u6307\u5728\u8c03\u7528\u51fd\u6570\u65f6\uff0c\u5c06\u503c\u4f20\u9012\u7ed9\u51fd\u6570\u4ee5\u4f9b\u5176\u4f7f\u7528\u6216\u5904\u7406\u3002<\/p>\n<\/p>\n

\u5728Python\u4e2d\uff0c\u5b57\u5178\u662f\u4e00\u79cd\u975e\u5e38\u7075\u6d3b\u548c\u5f3a\u5927\u7684\u6570\u636e\u7ed3\u6784\u3002\u5b57\u5178\u5141\u8bb8\u4f7f\u7528\u4efb\u4f55\u4e0d\u53ef\u53d8\u7c7b\u578b\u7684\u5bf9\u8c61\u4f5c\u4e3a\u952e\uff0c\u800c\u503c\u5219\u53ef\u4ee5\u662f\u4efb\u610f\u7c7b\u578b\u7684\u5bf9\u8c61\u3002\u8fd9\u4f7f\u5f97\u5b57\u5178\u975e\u5e38\u9002\u5408\u7528\u4e8e\u5b58\u50a8\u548c\u5feb\u901f\u67e5\u627e\u5173\u8054\u6570\u636e\u3002\u4ee5\u4e0b\u662f\u5173\u4e8ePython\u4e2d\u5982\u4f55\u4f7f\u7528value\u7684\u8be6\u7ec6\u5185\u5bb9\uff1a<\/p>\n<\/p>\n

\u4e00\u3001\u5b57\u5178\u4e2d\u7684\u952e\u503c\u5bf9<\/p>\n<\/p>\n

\u5b57\u5178\u662fPython\u4e2d\u7528\u4e8e\u5b58\u50a8\u952e\u503c\u5bf9\u7684\u5185\u7f6e\u6570\u636e\u7ed3\u6784\u3002\u6bcf\u4e2a\u952e\u503c\u5bf9\u5305\u542b\u4e00\u4e2a\u552f\u4e00\u7684\u952e\u548c\u4e00\u4e2a\u4e0e\u4e4b\u5173\u8054\u7684\u503c\u3002\u5b57\u5178\u662f\u65e0\u5e8f\u7684\uff0c\u8fd9\u610f\u5473\u7740\u952e\u503c\u5bf9\u7684\u5b58\u50a8\u987a\u5e8f\u53ef\u80fd\u4e0e\u63d2\u5165\u987a\u5e8f\u4e0d\u540c\u3002<\/p>\n<\/p>\n

    \n
  1. \u521b\u5efa\u5b57\u5178<\/li>\n<\/ol>\n

    \u8981\u521b\u5efa\u4e00\u4e2a\u5b57\u5178\uff0c\u53ef\u4ee5\u4f7f\u7528\u5927\u62ec\u53f7 {}<\/code> \u6216\u8005 dict()<\/code> \u51fd\u6570\u3002\u952e\u503c\u5bf9\u53ef\u4ee5\u5728\u5b57\u5178\u521b\u5efa\u65f6\u6307\u5b9a\uff0c\u4e5f\u53ef\u4ee5\u5728\u521b\u5efa\u540e\u6dfb\u52a0\u3002<\/p>\n<\/p>\n

    # \u4f7f\u7528\u5927\u62ec\u53f7\u521b\u5efa\u5b57\u5178<\/p>\n
    my_dict = {"name": "Alice", "age": 30, "city": "New York"}<\/p>\n
    \u4f7f\u7528 dict() \u51fd\u6570\u521b\u5efa\u5b57\u5178<\/strong><\/h2>\n
    my_dict = dict(name="Alice", age=30, city="New York")<\/p>\n
    <\/code><\/pre>\n<\/p>\n
      \n
    1. \u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c<\/li>\n<\/ol>\n
      \u53ef\u4ee5\u901a\u8fc7\u952e\u6765\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\u3002\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0c\u5c06\u4f1a\u5f15\u53d1 KeyError<\/code> \u5f02\u5e38\u3002\u53ef\u4ee5\u4f7f\u7528 get()<\/code> \u65b9\u6cd5\u6765\u907f\u514d\u8be5\u5f02\u5e38\u3002<\/p>\n<\/p>\n
      # \u901a\u8fc7\u952e\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c<\/p>\n
      name = my_dict["name"]<\/p>\n
      \u4f7f\u7528 get() \u65b9\u6cd5\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c<\/strong><\/h2>\n
      age = my_dict.get("age", "Not specified")<\/p>\n
      <\/code><\/pre>\n<\/p>\n
        \n
      1. \u4fee\u6539\u5b57\u5178\u4e2d\u7684\u503c<\/li>\n<\/ol>\n
        \u53ef\u4ee5\u901a\u8fc7\u6307\u5b9a\u952e\u6765\u4fee\u6539\u5b57\u5178\u4e2d\u7684\u503c\u3002\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0c\u5c06\u4f1a\u6dfb\u52a0\u65b0\u7684\u952e\u503c\u5bf9\u3002<\/p>\n<\/p>\n
        # \u4fee\u6539\u5b57\u5178\u4e2d\u7684\u503c<\/p>\n
        my_dict["age"] = 31<\/p>\n
        \u6dfb\u52a0\u65b0\u7684\u952e\u503c\u5bf9<\/strong><\/h2>\n
        my_dict["occupation"] = "Engineer"<\/p>\n
        <\/code><\/pre>\n<\/p>\n
          \n
        1. \u5220\u9664\u5b57\u5178\u4e2d\u7684\u952e\u503c\u5bf9<\/li>\n<\/ol>\n
          \u53ef\u4ee5\u4f7f\u7528 del<\/code> \u8bed\u53e5\u6216\u8005 pop()<\/code> \u65b9\u6cd5\u6765\u5220\u9664\u5b57\u5178\u4e2d\u7684\u952e\u503c\u5bf9\u3002<\/p>\n<\/p>\n
          # \u4f7f\u7528 del \u8bed\u53e5\u5220\u9664\u952e\u503c\u5bf9<\/p>\n
          del my_dict["city"]<\/p>\n
          \u4f7f\u7528 pop() \u65b9\u6cd5\u5220\u9664\u952e\u503c\u5bf9<\/strong><\/h2>\n
          occupation = my_dict.pop("occupation", "Not specified")<\/p>\n
          <\/code><\/pre>\n<\/p>\n
            \n
          1. \u904d\u5386\u5b57\u5178<\/li>\n<\/ol>\n
            \u53ef\u4ee5\u4f7f\u7528 items()<\/code> \u65b9\u6cd5\u904d\u5386\u5b57\u5178\u4e2d\u7684\u952e\u503c\u5bf9\u3002<\/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
            \u4e8c\u3001\u53d8\u91cf\u8d4b\u503c<\/p>\n<\/p>\n
            \u5728Python\u4e2d\uff0c\u53d8\u91cf\u8d4b\u503c\u662f\u5c06\u4e00\u4e2a\u503c\u5b58\u50a8\u5230\u4e00\u4e2a\u53d8\u91cf\u4e2d\u7684\u8fc7\u7a0b\u3002Python\u662f\u52a8\u6001\u7c7b\u578b\u8bed\u8a00\uff0c\u53d8\u91cf\u7c7b\u578b\u662f\u5728\u8fd0\u884c\u65f6\u786e\u5b9a\u7684\u3002<\/p>\n<\/p>\n
              \n
            1. \u57fa\u672c\u8d4b\u503c<\/li>\n<\/ol>\n
              \u53ef\u4ee5\u76f4\u63a5\u5c06\u4e00\u4e2a\u503c\u8d4b\u503c\u7ed9\u53d8\u91cf\u3002Python\u4f1a\u6839\u636e\u503c\u7684\u7c7b\u578b\u6765\u786e\u5b9a\u53d8\u91cf\u7684\u7c7b\u578b\u3002<\/p>\n<\/p>\n
              # \u6574\u6570\u8d4b\u503c<\/p>\n
              x = 10<\/p>\n
              \u5b57\u7b26\u4e32\u8d4b\u503c<\/strong><\/h2>\n
              name = "Alice"<\/p>\n
              \u5217\u8868\u8d4b\u503c<\/strong><\/h2>\n
              numbers = [1, 2, 3, 4, 5]<\/p>\n
              <\/code><\/pre>\n<\/p>\n
                \n
              1. \u591a\u91cd\u8d4b\u503c<\/li>\n<\/ol>\n
                Python\u5141\u8bb8\u5728\u4e00\u884c\u4e2d\u4e3a\u591a\u4e2a\u53d8\u91cf\u540c\u65f6\u8d4b\u503c\u3002\u8fd9\u79cd\u7279\u6027\u5728\u4ea4\u6362\u53d8\u91cf\u503c\u65f6\u7279\u522b\u6709\u7528\u3002<\/p>\n<\/p>\n
                # \u591a\u91cd\u8d4b\u503c<\/p>\n
                a, b, c = 1, 2, 3<\/p>\n
                \u4ea4\u6362\u53d8\u91cf\u503c<\/strong><\/h2>\n
                a, b = b, a<\/p>\n
                <\/code><\/pre>\n<\/p>\n
                  \n
                1. \u589e\u91cf\u8d4b\u503c<\/li>\n<\/ol>\n
                  Python\u652f\u6301\u589e\u91cf\u8d4b\u503c\u8fd0\u7b97\u7b26\uff0c\u4f8b\u5982 +=<\/code>\u3001-=<\/code>\u3001*=<\/code> \u548c \/=<\/code>\u3002\u8fd9\u4e9b\u8fd0\u7b97\u7b26\u7528\u6765\u5728\u8d4b\u503c\u7684\u540c\u65f6\u8fdb\u884c\u7b97\u672f\u8fd0\u7b97\u3002<\/p>\n<\/p>\n
                  # \u589e\u91cf\u8d4b\u503c<\/p>\n
                  x = 5<\/p>\n
                  x += 2  # \u76f8\u5f53\u4e8e x = x + 2<\/p>\n
                  <\/code><\/pre>\n<\/p>\n
                  \u4e09\u3001\u51fd\u6570\u53c2\u6570\u4f20\u9012<\/p>\n<\/p>\n
                  \u5728Python\u4e2d\uff0c\u51fd\u6570\u662f\u4e00\u4e2a\u53ef\u4ee5\u91cd\u590d\u4f7f\u7528\u7684\u4ee3\u7801\u5757\u3002\u51fd\u6570\u53ef\u4ee5\u63a5\u53d7\u53c2\u6570\u5e76\u8fd4\u56de\u503c\u3002\u53c2\u6570\u662f\u4f20\u9012\u7ed9\u51fd\u6570\u7684\u6570\u636e\uff0c\u5b83\u4eec\u5141\u8bb8\u51fd\u6570\u5728\u6267\u884c\u65f6\u4f7f\u7528\u5916\u90e8\u63d0\u4f9b\u7684\u4fe1\u606f\u3002<\/p>\n<\/p>\n
                    \n
                  1. \u4f4d\u7f6e\u53c2\u6570<\/li>\n<\/ol>\n
                    \u4f4d\u7f6e\u53c2\u6570\u662f\u6700\u5e38\u89c1\u7684\u51fd\u6570\u53c2\u6570\u7c7b\u578b\u3002\u8c03\u7528\u51fd\u6570\u65f6\uff0c\u53c2\u6570\u503c\u6309\u7167\u4f4d\u7f6e\u987a\u5e8f\u4f20\u9012\u7ed9\u51fd\u6570\u3002<\/p>\n<\/p>\n
                    def greet(name, age):<\/p>\n
                        print(f"Hello, {name}! You are {age} years old.")<\/p>\n
                    \u4f7f\u7528\u4f4d\u7f6e\u53c2\u6570\u8c03\u7528\u51fd\u6570<\/strong><\/h2>\n
                    greet("Alice", 30)<\/p>\n
                    <\/code><\/pre>\n<\/p>\n
                      \n
                    1. \u5173\u952e\u5b57\u53c2\u6570<\/li>\n<\/ol>\n
                      \u5173\u952e\u5b57\u53c2\u6570\u5141\u8bb8\u5728\u8c03\u7528\u51fd\u6570\u65f6\u660e\u786e\u6307\u5b9a\u53c2\u6570\u540d\uff0c\u8fd9\u4f7f\u5f97\u4ee3\u7801\u66f4\u5177\u53ef\u8bfb\u6027\u3002<\/p>\n<\/p>\n
                      # \u4f7f\u7528\u5173\u952e\u5b57\u53c2\u6570\u8c03\u7528\u51fd\u6570<\/p>\n
                      greet(age=30, name="Alice")<\/p>\n
                      <\/code><\/pre>\n<\/p>\n
                        \n
                      1. \u9ed8\u8ba4\u53c2\u6570<\/li>\n<\/ol>\n
                        \u53ef\u4ee5\u4e3a\u51fd\u6570\u53c2\u6570\u6307\u5b9a\u9ed8\u8ba4\u503c\u3002\u5982\u679c\u8c03\u7528\u51fd\u6570\u65f6\u672a\u63d0\u4f9b\u8be5\u53c2\u6570\uff0c\u51fd\u6570\u5c06\u4f7f\u7528\u9ed8\u8ba4\u503c\u3002<\/p>\n<\/p>\n
                        def greet(name, age=25):<\/p>\n
                            print(f"Hello, {name}! You are {age} years old.")<\/p>\n
                        \u4f7f\u7528\u9ed8\u8ba4\u53c2\u6570\u8c03\u7528\u51fd\u6570<\/strong><\/h2>\n
                        greet("Bob")<\/p>\n
                        <\/code><\/pre>\n<\/p>\n
                          \n
                        1. \u53ef\u53d8\u53c2\u6570<\/li>\n<\/ol>\n
                          Python\u5141\u8bb8\u51fd\u6570\u63a5\u53d7\u53ef\u53d8\u6570\u91cf\u7684\u53c2\u6570\u3002\u4f7f\u7528 *args<\/code> \u548c kwargs<\/code> \u53ef\u4ee5\u5904\u7406\u4f4d\u7f6e\u53c2\u6570\u548c\u5173\u952e\u5b57\u53c2\u6570\u3002<\/p>\n<\/p>\n
                          def print_numbers(*args):<\/p>\n
                              for number in args:<\/p>\n
                                  print(number)<\/p>\n
                          \u4f7f\u7528\u53ef\u53d8\u53c2\u6570\u8c03\u7528\u51fd\u6570<\/strong><\/h2>\n
                          print_numbers(1, 2, 3, 4, 5)<\/p>\n
                          def print_info(kwargs):<\/p>\n
                              for key, value in kwargs.items():<\/p>\n
                                  print(f"{key}: {value}")<\/p>\n
                          \u4f7f\u7528\u5173\u952e\u5b57\u53ef\u53d8\u53c2\u6570\u8c03\u7528\u51fd\u6570<\/strong><\/h2>\n
                          print_info(name="Alice", age=30, city="New York")<\/p>\n
                          <\/code><\/pre>\n<\/p>\n
                          \u56db\u3001\u4f7f\u7528value\u7684\u9ad8\u7ea7\u6280\u5de7<\/p>\n<\/p>\n
                          \u5728Python\u4e2d\uff0c\u9664\u4e86\u57fa\u672c\u7684\u4f7f\u7528value\u7684\u65b9\u5f0f\u5916\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7\u4e00\u4e9b\u9ad8\u7ea7\u6280\u5de7\u6765\u63d0\u9ad8\u4ee3\u7801\u7684\u6548\u7387\u548c\u53ef\u8bfb\u6027\u3002<\/p>\n<\/p>\n
                            \n
                          1. \u5217\u8868\u89e3\u6790<\/li>\n<\/ol>\n
                            \u5217\u8868\u89e3\u6790\u662f\u4e00\u79cd\u7b80\u6d01\u7684\u8bed\u6cd5\uff0c\u7528\u4e8e\u521b\u5efa\u65b0\u5217\u8868\u3002\u5b83\u53ef\u4ee5\u66ff\u4ee3\u5e38\u7528\u7684\u5faa\u73af\u548c\u6761\u4ef6\u903b\u8f91\u3002<\/p>\n<\/p>\n
                            # \u4f7f\u7528\u5217\u8868\u89e3\u6790\u521b\u5efa\u5217\u8868<\/p>\n
                            squares = [x2 for x in range(10)]<\/p>\n
                            <\/code><\/pre>\n<\/p>\n
                              \n
                            1. \u5b57\u5178\u89e3\u6790<\/li>\n<\/ol>\n
                              \u5b57\u5178\u89e3\u6790\u7c7b\u4f3c\u4e8e\u5217\u8868\u89e3\u6790\uff0c\u7528\u4e8e\u521b\u5efa\u65b0\u7684\u5b57\u5178\u3002<\/p>\n<\/p>\n
                              # \u4f7f\u7528\u5b57\u5178\u89e3\u6790\u521b\u5efa\u5b57\u5178<\/p>\n
                              squares_dict = {x: x2 for x in range(10)}<\/p>\n
                              <\/code><\/pre>\n<\/p>\n
                                \n
                              1. \u96c6\u5408\u89e3\u6790<\/li>\n<\/ol>\n
                                \u96c6\u5408\u89e3\u6790\u7528\u4e8e\u521b\u5efa\u96c6\u5408\u3002\u96c6\u5408\u662f\u4e00\u4e2a\u65e0\u5e8f\u4e14\u4e0d\u91cd\u590d\u7684\u5143\u7d20\u96c6\u5408\u3002<\/p>\n<\/p>\n
                                # \u4f7f\u7528\u96c6\u5408\u89e3\u6790\u521b\u5efa\u96c6\u5408<\/p>\n
                                unique_squares = {x2 for x in range(-9, 10)}<\/p>\n
                                <\/code><\/pre>\n<\/p>\n
                                  \n
                                1. \u4f7f\u7528zip()<\/code>\u51fd\u6570<\/li>\n<\/ol>\n
                                  zip()<\/code>\u51fd\u6570\u7528\u4e8e\u5c06\u591a\u4e2a\u53ef\u8fed\u4ee3\u5bf9\u8c61\u6253\u5305\u6210\u4e00\u4e2a\u5143\u7ec4\u7684\u8fed\u4ee3\u5668\u3002\u5b83\u975e\u5e38\u9002\u5408\u7528\u4e8e\u5e76\u884c\u8fed\u4ee3\u591a\u4e2a\u5e8f\u5217\u3002<\/p>\n<\/p>\n
                                  names = ["Alice", "Bob", "Charlie"]<\/p>\n
                                  ages = [30, 25, 35]<\/p>\n
                                  \u4f7f\u7528 zip() \u51fd\u6570\u5e76\u884c\u8fed\u4ee3<\/strong><\/h2>\n
                                  for name, age in zip(names, ages):<\/p>\n
                                      print(f"{name} is {age} years old.")<\/p>\n
                                  <\/code><\/pre>\n<\/p>\n
                                  \u4e94\u3001\u5728\u5b9e\u8df5\u4e2d\u4f7f\u7528value<\/p>\n<\/p>\n
                                  \u4e86\u89e3\u5982\u4f55\u4f7f\u7528value\u5bf9\u4e8e\u7f16\u5199\u9ad8\u6548\u7684Python\u4ee3\u7801\u81f3\u5173\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5728\u5b9e\u8df5\u4e2d\u4f7f\u7528value\u7684\u6280\u5de7\u548c\u5efa\u8bae\u3002<\/p>\n<\/p>\n
                                    \n
                                  1. \u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7ed3\u6784<\/li>\n<\/ol>\n
                                    \u6839\u636e\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7ed3\u6784\u3002\u5b57\u5178\u9002\u5408\u7528\u4e8e\u5feb\u901f\u67e5\u627e\uff0c\u5217\u8868\u9002\u5408\u7528\u4e8e\u6709\u5e8f\u5b58\u50a8\uff0c\u96c6\u5408\u9002\u5408\u7528\u4e8e\u53bb\u91cd\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
                                      \n
                                    1. \u907f\u514d\u4e0d\u5fc5\u8981\u7684\u590d\u5236<\/li>\n<\/ol>\n
                                      \u5728\u5904\u7406\u5927\u578b\u6570\u636e\u96c6\u65f6\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u590d\u5236\u64cd\u4f5c\u3002\u53ef\u4ee5\u4f7f\u7528\u751f\u6210\u5668\u3001\u8fed\u4ee3\u5668\u7b49\u60f0\u6027\u8ba1\u7b97\u65b9\u6cd5\u6765\u8282\u7701\u5185\u5b58\u3002<\/p>\n<\/p>\n
                                        \n
                                      1. \u4f7f\u7528\u7f13\u5b58\u63d0\u9ad8\u6548\u7387<\/li>\n<\/ol>\n
                                        \u5728\u8ba1\u7b97\u5bc6\u96c6\u578b\u64cd\u4f5c\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u7f13\u5b58\u6765\u5b58\u50a8\u4e2d\u95f4\u7ed3\u679c\uff0c\u4ece\u800c\u63d0\u9ad8\u6548\u7387\u3002Python\u7684functools<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86lru_cache<\/code>\u88c5\u9970\u5668\u6765\u5b9e\u73b0\u8fd9\u4e00\u70b9\u3002<\/p>\n<\/p>\n
                                        from functools import lru_cache<\/p>\n
                                        @lru_cache(maxsize=None)<\/p>\n
                                        def fibonacci(n):<\/p>\n
                                            if n < 2:<\/p>\n
                                                return n<\/p>\n
                                            return fibonacci(n-1) + fibonacci(n-2)<\/p>\n
                                        <\/code><\/pre>\n<\/p>\n
                                          \n
                                        1. \u5408\u7406\u4f7f\u7528\u5f02\u5e38\u5904\u7406<\/li>\n<\/ol>\n
                                          \u5728\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\u65f6\uff0c\u5408\u7406\u4f7f\u7528\u5f02\u5e38\u5904\u7406\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u5065\u58ee\u6027\u3002<\/p>\n<\/p>\n
                                          try:<\/p>\n
                                              value = my_dict["non_existing_key"]<\/p>\n
                                          except KeyError:<\/p>\n
                                              value = "Default value"<\/p>\n
                                          <\/code><\/pre>\n<\/p>\n
                                            \n
                                          1. \u6ce8\u91cd\u4ee3\u7801\u53ef\u8bfb\u6027<\/li>\n<\/ol>\n
                                            \u65e0\u8bba\u4f7f\u7528\u54ea\u79cd\u65b9\u5f0f\uff0c\u5728\u7f16\u5199\u4ee3\u7801\u65f6\u90fd\u5e94\u6ce8\u91cd\u53ef\u8bfb\u6027\u3002\u4f7f\u7528\u6709\u610f\u4e49\u7684\u53d8\u91cf\u540d\u3001\u5408\u7406\u7684\u7f29\u8fdb\u548c\u6ce8\u91ca\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<\/p>\n
                                            \u901a\u8fc7\u638c\u63e1Python\u4e2d\u4f7f\u7528value\u7684\u5404\u79cd\u65b9\u6cd5\u548c\u6280\u5de7\uff0c\u53ef\u4ee5\u7f16\u5199\u51fa\u66f4\u52a0\u9ad8\u6548\u3001\u7b80\u6d01\u548c\u53ef\u8bfb\u7684\u4ee3\u7801\u3002\u8fd9\u4e0d\u4ec5\u6709\u52a9\u4e8e\u4e2a\u4eba\u5f00\u53d1\uff0c\u4e5f\u5728\u56e2\u961f\u534f\u4f5c\u4e2d\u53d1\u6325\u7740\u91cd\u8981\u4f5c\u7528\u3002\u5e0c\u671b\u8fd9\u7bc7\u6587\u7ae0\u80fd\u4e3a\u4f60\u63d0\u4f9b\u6709\u4ef7\u503c\u7684\u6307\u5bfc\uff0c\u5e2e\u52a9\u4f60\u5728Python\u7f16\u7a0b\u4e2d\u66f4\u597d\u5730\u4f7f\u7528value\u3002<\/p>\n<\/p>\n
                                            \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
                                             \u5982\u4f55\u5728Python\u4e2d\u4f7f\u7528\u5b57\u5178\u7684\u503c\uff1f<\/strong>
                                            \u5728Python\u4e2d\uff0c\u5b57\u5178\u662f\u4e00\u79cd\u975e\u5e38\u7075\u6d3b\u7684\u6570\u636e\u7ed3\u6784\uff0c\u53ef\u4ee5\u901a\u8fc7\u952e\u6765\u8bbf\u95ee\u5176\u5bf9\u5e94\u7684\u503c\u3002\u8981\u83b7\u53d6\u5b57\u5178\u4e2d\u7684\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u540d\u52a0\u4e0a\u952e\u540d\u7684\u65b9\u5f0f\uff0c\u4f8b\u5982\uff1amy_dict[key]<\/code>\u3002\u6b64\u5916\uff0c\u53ef\u4ee5\u4f7f\u7528get()<\/code>\u65b9\u6cd5\u6765\u5b89\u5168\u5730\u83b7\u53d6\u503c\uff0c\u8fd9\u79cd\u65b9\u5f0f\u5728\u952e\u4e0d\u5b58\u5728\u65f6\u4e0d\u4f1a\u629b\u51fa\u9519\u8bef\uff0c\u800c\u662f\u8fd4\u56deNone<\/code>\u6216\u4f60\u6307\u5b9a\u7684\u9ed8\u8ba4\u503c\u3002\u4f8b\u5982\uff1amy_dict.get(key, default_value)<\/code>\u3002<\/p>\n
                                            \u5728Python\u4e2d\u5982\u4f55\u904d\u5386\u5b57\u5178\u7684\u503c\uff1f<\/strong>
                                            \u904d\u5386\u5b57\u5178\u7684\u503c\u53ef\u4ee5\u4f7f\u7528values()<\/code>\u65b9\u6cd5\uff0c\u5b83\u8fd4\u56de\u5b57\u5178\u4e2d\u6240\u6709\u503c\u7684\u89c6\u56fe\u5bf9\u8c61\u3002\u53ef\u4ee5\u7ed3\u5408for<\/code>\u5faa\u73af\u8fdb\u884c\u904d\u5386\uff0c\u4f8b\u5982\uff1a  <\/p>\n
                                            for value in my_dict.values():\n    print(value)\n<\/code><\/pre>\n
                                            \u8fd9\u79cd\u65b9\u5f0f\u7b80\u6d01\u4e14\u9ad8\u6548\uff0c\u9002\u5408\u5728\u9700\u8981\u5904\u7406\u6240\u6709\u503c\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528\u3002<\/p>\n
                                            \u5982\u4f55\u5728Python\u4e2d\u6839\u636e\u503c\u7b5b\u9009\u5b57\u5178\u4e2d\u7684\u9879\uff1f<\/strong>
                                            \u5982\u679c\u9700\u8981\u6839\u636e\u7279\u5b9a\u6761\u4ef6\u7b5b\u9009\u5b57\u5178\u4e2d\u7684\u9879\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u63a8\u5bfc\u5f0f\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u60f3\u8981\u63d0\u53d6\u6240\u6709\u503c\u5927\u4e8e\u67d0\u4e2a\u6570\u7684\u9879\uff0c\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a  <\/p>\n
                                            filtered_dict = {key: value for key, value in my_dict.items() if value > threshold}\n<\/code><\/pre>\n
                                            \u8fd9\u79cd\u65b9\u6cd5\u4e0d\u4ec5\u9ad8\u6548\uff0c\u800c\u4e14\u4ee3\u7801\u53ef\u8bfb\u6027\u5f3a\uff0c\u9002\u5408\u5728\u6570\u636e\u5904\u7406\u65f6\u4f7f\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u4f7f\u7528value\u7684\u65b9\u5f0f\u5305\u62ec\uff1a\u5b57\u5178\u4e2d\u7684\u952e\u503c\u5bf9\u3001\u53d8\u91cf\u8d4b\u503c\u3001\u51fd\u6570\u53c2\u6570\u4f20\u9012\u3002 \u5b57\u5178\u662fPython\u4e2d\u4e00\u79cd […]","protected":false},"author":3,"featured_media":950126,"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\/950125"}],"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=950125"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/950125\/revisions"}],"predecessor-version":[{"id":950127,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/950125\/revisions\/950127"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/950126"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=950125"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=950125"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=950125"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}