{"id":43933,"date":"2025-08-06T14:47:16","date_gmt":"2025-08-06T05:47:16","guid":{"rendered":"https:\/\/techgym.jp\/?p=43933"},"modified":"2025-08-06T14:47:20","modified_gmt":"2025-08-06T05:47:20","slug":"python-key-value-swap","status":"publish","type":"post","link":"https:\/\/techgym.jp\/column\/python-key-value-swap\/","title":{"rendered":"Python\u8f9e\u66f8\u306e\u30ad\u30fc\u3068\u5024\u3092\u5165\u308c\u66ff\u3048\u308b\u65b9\u6cd5\u5b8c\u5168\u30ac\u30a4\u30c9\uff1a\u52b9\u7387\u7684\u306a\u53cd\u8ee2\u30fb\u30b9\u30ef\u30c3\u30d7\u30c6\u30af\u30cb\u30c3\u30af"},"content":{"rendered":"\n

\u00a0<\/p>\n

Python\u8f9e\u66f8\u3067\u300c\u30ad\u30fc\u3068\u5024\u3092\u9006\u306b\u3057\u305f\u3044\u300d\u300c\u9006\u5f15\u304d\u8f9e\u66f8\u3092\u4f5c\u6210\u3057\u305f\u3044\u300d\u3068\u3044\u3046\u5834\u9762\u306f\u591a\u304f\u3042\u308a\u307e\u3059\u3002\u30c7\u30fc\u30bf\u306e\u5909\u63db\u3001\u691c\u7d22\u306e\u9ad8\u901f\u5316\u3001API\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u6574\u5f62\u306a\u3069\u3001\u69d8\u3005\u306a\u7528\u9014\u3067\u8f9e\u66f8\u306e\u53cd\u8ee2\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001\u8f9e\u66f8\u306e\u30ad\u30fc\u3068\u5024\u3092\u52b9\u7387\u7684\u306b\u5165\u308c\u66ff\u3048\u308b\u65b9\u6cd5\u3092\u3001\u5b9f\u8df5\u7684\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3068\u3068\u3082\u306b\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n

\u57fa\u672c\u7684\u306a\u30ad\u30fc\u3068\u5024\u306e\u5165\u308c\u66ff\u3048\u65b9\u6cd5<\/h2>\n

\u8f9e\u66f8\u5185\u5305\u8868\u8a18\u3092\u4f7f\u3063\u305f\u57fa\u672c\u7684\u306a\u53cd\u8ee2<\/h3>\n

\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u3067\u8aad\u307f\u3084\u3059\u3044\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n

original = {'a': 1, 'b': 2, 'c': 3}\n\n# \u30ad\u30fc\u3068\u5024\u3092\u5165\u308c\u66ff\u3048\nreversed_dict = {v: k for k, v in original.items()}\nprint(reversed_dict)  # {1: 'a', 2: 'b', 3: 'c'}\n<\/code><\/pre>\n
for\u6587\u3092\u4f7f\u3063\u305f\u53cd\u8ee2<\/h3>\n
original = {'name': '\u592a\u90ce', 'age': 25, 'city': '\u6771\u4eac'}\n\n# for\u6587\u3067\u53cd\u8ee2\nreversed_dict = {}\nfor key, value in original.items():\n    reversed_dict[value] = key\n\nprint(reversed_dict)  # {'\u592a\u90ce': 'name', 25: 'age', '\u6771\u4eac': 'city'}\n<\/code><\/pre>\n
dict()\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u4f7f\u7528<\/h3>\n
original = {'apple': '\u308a\u3093\u3054', 'banana': '\u30d0\u30ca\u30ca', 'orange': '\u30aa\u30ec\u30f3\u30b8'}\n\n# dict()\u3092\u4f7f\u7528\u3057\u305f\u53cd\u8ee2\nreversed_dict = dict((v, k) for k, v in original.items())\nprint(reversed_dict)  # {'\u308a\u3093\u3054': 'apple', '\u30d0\u30ca\u30ca': 'banana', '\u30aa\u30ec\u30f3\u30b8': 'orange'}\n<\/code><\/pre>\n
\u5024\u304c\u91cd\u8907\u3059\u308b\u5834\u5408\u306e\u51e6\u7406<\/h2>\n
\u5024\u306e\u91cd\u8907\u3092\u7121\u8996\u3059\u308b\u65b9\u6cd5<\/h3>\n
colors = {'red': '\u8d64', 'blue': '\u9752', 'green': '\u7dd1', 'crimson': '\u8d64'}\n\n# \u5f8c\u304b\u3089\u51e6\u7406\u3055\u308c\u305f\u30ad\u30fc\u3067\u4e0a\u66f8\u304d\nsimple_reverse = {v: k for k, v in colors.items()}\nprint(simple_reverse)  # {'\u8d64': 'crimson', '\u9752': 'blue', '\u7dd1': 'green'}\n<\/code><\/pre>\n
\u91cd\u8907\u3059\u308b\u5024\u3092\u30ea\u30b9\u30c8\u3067\u4fdd\u6301<\/h3>\n
colors = {'red': '\u8d64', 'blue': '\u9752', 'green': '\u7dd1', 'crimson': '\u8d64'}\n\n# \u91cd\u8907\u5024\u306f\u30ea\u30b9\u30c8\u3067\u7ba1\u7406\ndef reverse_with_duplicates(dictionary):\n    reversed_dict = {}\n    for key, value in dictionary.items():\n        if value not in reversed_dict:\n            reversed_dict[value] = []\n        reversed_dict[value].append(key)\n    return reversed_dict\n\nresult = reverse_with_duplicates(colors)\nprint(result)  # {'\u8d64': ['red', 'crimson'], '\u9752': ['blue'], '\u7dd1': ['green']}\n<\/code><\/pre>\n
\u6700\u521d\u306b\u898b\u3064\u304b\u3063\u305f\u5024\u306e\u307f\u4fdd\u6301<\/h3>\n
colors = {'red': '\u8d64', 'blue': '\u9752', 'green': '\u7dd1', 'crimson': '\u8d64'}\n\n# \u6700\u521d\u306e\u5024\u306e\u307f\u4fdd\u6301\ndef reverse_first_only(dictionary):\n    reversed_dict = {}\n    for key, value in dictionary.items():\n        if value not in reversed_dict:\n            reversed_dict[value] = key\n    return reversed_dict\n\nresult = reverse_first_only(colors)\nprint(result)  # {'\u8d64': 'red', '\u9752': 'blue', '\u7dd1': 'green'}\n<\/code><\/pre>\n
\u7279\u5b9a\u306e\u578b\u306e\u5024\u306e\u307f\u53cd\u8ee2<\/h2>\n
\u6570\u5024\u306e\u307f\u3092\u53cd\u8ee2<\/h3>\n
mixed_data = {'name': '\u592a\u90ce', 'age': 25, 'score': 85, 'active': True}\n\n# \u6570\u5024\u306e\u307f\u53cd\u8ee2\nnumeric_reverse = {\n    v: k for k, v in mixed_data.items() \n    if isinstance(v, (int, float))\n}\nprint(numeric_reverse)  # {25: 'age', 85: 'score'}\n<\/code><\/pre>\n
\u6587\u5b57\u5217\u306e\u307f\u3092\u53cd\u8ee2<\/h3>\n
user_info = {'id': 123, 'name': '\u592a\u90ce', 'email': 'taro@example.com', 'age': 25}\n\n# \u6587\u5b57\u5217\u306e\u307f\u53cd\u8ee2\nstring_reverse = {\n    v: k for k, v in user_info.items() \n    if isinstance(v, str)\n}\nprint(string_reverse)  # {'\u592a\u90ce': 'name', 'taro@example.com': 'email'}\n<\/code><\/pre>\n
\u6761\u4ef6\u4ed8\u304d\u53cd\u8ee2<\/h3>\n
scores = {'\u592a\u90ce': 85, '\u82b1\u5b50': 92, '\u6b21\u90ce': 76, '\u7f8e\u9999': 89}\n\n# 80\u70b9\u4ee5\u4e0a\u306e\u307f\u53cd\u8ee2\nhigh_scores_reverse = {\n    v: k for k, v in scores.items() \n    if v >= 80\n}\nprint(high_scores_reverse)  # {85: '\u592a\u90ce', 92: '\u82b1\u5b50', 89: '\u7f8e\u9999'}\n<\/code><\/pre>\n
\u5b9f\u8df5\u7684\u306a\u5fdc\u7528\u4f8b<\/h2>\n
\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u8f9e\u66f8\u306e\u53cd\u8ee2<\/h3>\n
error_codes = {\n    'NOT_FOUND': 404,\n    'UNAUTHORIZED': 401,\n    'FORBIDDEN': 403,\n    'SERVER_ERROR': 500\n}\n\n# \u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u304b\u3089\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u691c\u7d22\u3059\u308b\u305f\u3081\u53cd\u8ee2\ncode_to_message = {v: k for k, v in error_codes.items()}\nprint(code_to_message)  # {404: 'NOT_FOUND', 401: 'UNAUTHORIZED', 403: 'FORBIDDEN', 500: 'SERVER_ERROR'}\n\n# \u4f7f\u7528\u4f8b\ndef get_error_message(code):\n    return code_to_message.get(code, 'UNKNOWN_ERROR')\n\nprint(get_error_message(404))  # 'NOT_FOUND'\n<\/code><\/pre>\n
\u5546\u54c1ID\u3068\u540d\u524d\u306e\u76f8\u4e92\u5909\u63db<\/h3>\n
products = {\n    'PROD001': '\u30ce\u30fc\u30c8PC',\n    'PROD002': '\u30de\u30a6\u30b9', \n    'PROD003': '\u30ad\u30fc\u30dc\u30fc\u30c9',\n    'PROD004': '\u30e2\u30cb\u30bf\u30fc'\n}\n\n# \u5546\u54c1\u540d\u304b\u3089ID\u3092\u691c\u7d22\u3059\u308b\u305f\u3081\u53cd\u8ee2\nname_to_id = {v: k for k, v in products.items()}\n\ndef find_product_id(product_name):\n    return name_to_id.get(product_name, 'NOT_FOUND')\n\ndef find_product_name(product_id):\n    return products.get(product_id, 'NOT_FOUND')\n\nprint(find_product_id('\u30de\u30a6\u30b9'))    # 'PROD002'\nprint(find_product_name('PROD003'))  # '\u30ad\u30fc\u30dc\u30fc\u30c9'\n<\/code><\/pre>\n
\u591a\u8a00\u8a9e\u5bfe\u5fdc\u3067\u306e\u6d3b\u7528<\/h3>\n
japanese_to_english = {\n    '\u72ac': 'dog',\n    '\u732b': 'cat', \n    '\u9ce5': 'bird',\n    '\u9b5a': 'fish'\n}\n\n# \u82f1\u8a9e\u304b\u3089\u65e5\u672c\u8a9e\u3078\u306e\u5909\u63db\u8f9e\u66f8\u3092\u4f5c\u6210\nenglish_to_japanese = {v: k for k, v in japanese_to_english.items()}\n\ndef translate_to_english(japanese_word):\n    return japanese_to_english.get(japanese_word, '\u7ffb\u8a33\u4e0d\u53ef')\n\ndef translate_to_japanese(english_word):\n    return english_to_japanese.get(english_word, '\u7ffb\u8a33\u4e0d\u53ef')\n\nprint(translate_to_english('\u732b'))    # 'cat'\nprint(translate_to_japanese('dog'))  # '\u72ac'\n<\/code><\/pre>\n
\u30cd\u30b9\u30c8\u3057\u305f\u8f9e\u66f8\u3067\u306e\u53cd\u8ee2<\/h2>\n
\u5358\u968e\u5c64\u306e\u5024\u306e\u307f\u53cd\u8ee2<\/h3>\n
user_data = {\n    'personal': {'name': '\u592a\u90ce', 'age': 25},\n    'contact': {'email': 'taro@example.com', 'phone': '090-1234-5678'}\n}\n\n# \u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u30ad\u30fc\u306e\u307f\u53cd\u8ee2\ntop_level_reverse = {str(v): k for k, v in user_data.items()}\nprint(top_level_reverse)  # \u8f9e\u66f8\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6587\u5b57\u5217\u5316\u3055\u308c\u3066\u8868\u793a\n<\/code><\/pre>\n
\u30cd\u30b9\u30c8\u3057\u305f\u8f9e\u66f8\u3092\u5e73\u5766\u5316\u3057\u3066\u53cd\u8ee2<\/h3>\n
nested_config = {\n    'database': {\n        'host': 'localhost',\n        'port': 5432\n    },\n    'cache': {\n        'host': 'redis-server',\n        'port': 6379\n    }\n}\n\ndef flatten_and_reverse(nested_dict, parent_key='', sep='_'):\n    \"\"\"\u30cd\u30b9\u30c8\u3057\u305f\u8f9e\u66f8\u3092\u5e73\u5766\u5316\u3057\u3066\u53cd\u8ee2\"\"\"\n    flattened = {}\n    \n    for key, value in nested_dict.items():\n        new_key = f\"{parent_key}{sep}{key}\" if parent_key else key\n        \n        if isinstance(value, dict):\n            flattened.update(flatten_and_reverse(value, new_key, sep))\n        else:\n            flattened[new_key] = value\n    \n    # \u5e73\u5766\u5316\u3057\u305f\u8f9e\u66f8\u3092\u53cd\u8ee2\n    return {v: k for k, v in flattened.items()}\n\nresult = flatten_and_reverse(nested_config)\nprint(result)  # {'localhost': 'database_host', 5432: 'database_port', 'redis-server': 'cache_host', 6379: 'cache_port'}\n<\/code><\/pre>\n
\u9ad8\u901f\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n
\u5927\u91cf\u30c7\u30fc\u30bf\u3067\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6bd4\u8f03<\/h3>\n
import timeit\n\n# \u5927\u91cf\u30c7\u30fc\u30bf\u306e\u6e96\u5099\nlarge_dict = {f'key_{i}': i for i in range(100000)}\n\n# \u65b9\u6cd51: \u8f9e\u66f8\u5185\u5305\u8868\u8a18\ndef method1(dictionary):\n    return {v: k for k, v in dictionary.items()}\n\n# \u65b9\u6cd52: for\u6587\ndef method2(dictionary):\n    result = {}\n    for k, v in dictionary.items():\n        result[v] = k\n    return result\n\n# \u65b9\u6cd53: dict()\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\ndef method3(dictionary):\n    return dict((v, k) for k, v in dictionary.items())\n\n# \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c6\u30b9\u30c8\uff08\u5c0f\u898f\u6a21\u30c7\u30fc\u30bf\u3067\u5b9f\u884c\uff09\nsmall_dict = {f'key_{i}': i for i in range(1000)}\n\ntime1 = timeit.timeit(lambda: method1(small_dict), number=1000)\ntime2 = timeit.timeit(lambda: method2(small_dict), number=1000)\ntime3 = timeit.timeit(lambda: method3(small_dict), number=1000)\n\nprint(f\"\u8f9e\u66f8\u5185\u5305\u8868\u8a18: {time1:.4f}\u79d2\")\nprint(f\"for\u6587: {time2:.4f}\u79d2\")\nprint(f\"dict()\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf: {time3:.4f}\u79d2\")\n<\/code><\/pre>\n
\u30e1\u30e2\u30ea\u52b9\u7387\u7684\u306a\u51e6\u7406<\/h3>\n
def memory_efficient_reverse(large_dict, chunk_size=10000):\n    \"\"\"\u30e1\u30e2\u30ea\u52b9\u7387\u7684\u306a\u8f9e\u66f8\u53cd\u8ee2\"\"\"\n    reversed_dict = {}\n    items = list(large_dict.items())\n    \n    # \u30c1\u30e3\u30f3\u30af\u5358\u4f4d\u3067\u51e6\u7406\n    for i in range(0, len(items), chunk_size):\n        chunk = items[i:i + chunk_size]\n        for key, value in chunk:\n            reversed_dict[value] = key\n    \n    return reversed_dict\n\n# \u4f7f\u7528\u4f8b\nlarge_data = {f'item_{i}': i for i in range(50000)}\nresult = memory_efficient_reverse(large_data)\nprint(f\"\u51e6\u7406\u5b8c\u4e86: {len(result)}\u4ef6\")\n<\/code><\/pre>\n
\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/h2>\n
\u5b89\u5168\u306a\u53cd\u8ee2\u51e6\u7406<\/h3>\n
def safe_reverse_dict(dictionary, handle_duplicates='ignore'):\n    \"\"\"\u5b89\u5168\u306a\u8f9e\u66f8\u53cd\u8ee2\uff08\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u4ed8\u304d\uff09\"\"\"\n    if not isinstance(dictionary, dict):\n        raise TypeError(\"\u5f15\u6570\u306f\u8f9e\u66f8\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\")\n    \n    reversed_dict = {}\n    duplicates = []\n    \n    for key, value in dictionary.items():\n        # \u30cf\u30c3\u30b7\u30e5\u53ef\u80fd\u304b\u30c1\u30a7\u30c3\u30af\n        try:\n            hash(value)\n        except TypeError:\n            print(f\"\u8b66\u544a: \u5024 '{value}' \u306f\u30cf\u30c3\u30b7\u30e5\u4e0d\u53ef\u80fd\u306e\u305f\u3081\u30b9\u30ad\u30c3\u30d7\")\n            continue\n        \n        if value in reversed_dict:\n            duplicates.append((key, value))\n            if handle_duplicates == 'error':\n                raise ValueError(f\"\u91cd\u8907\u3059\u308b\u5024: {value}\")\n            elif handle_duplicates == 'list':\n                if not isinstance(reversed_dict[value], list):\n                    reversed_dict[value] = [reversed_dict[value]]\n                reversed_dict[value].append(key)\n            # 'ignore'\u306e\u5834\u5408\u306f\u4e0a\u66f8\u304d\n        else:\n            reversed_dict[value] = key\n    \n    return reversed_dict, duplicates\n\n# \u4f7f\u7528\u4f8b\ntest_data = {'a': 1, 'b': 2, 'c': 1, 'd': [1, 2, 3]}  # \u30ea\u30b9\u30c8\u306f\u30cf\u30c3\u30b7\u30e5\u4e0d\u53ef\u80fd\n\nresult, dups = safe_reverse_dict(test_data, handle_duplicates='list')\nprint(\"\u53cd\u8ee2\u7d50\u679c:\", result)\nprint(\"\u91cd\u8907:\", dups)\n<\/code><\/pre>\n
\u578b\u30c1\u30a7\u30c3\u30af\u4ed8\u304d\u53cd\u8ee2<\/h3>\n
from typing import Dict, Any, Union, List\n\ndef typed_reverse_dict(\n    dictionary: Dict[Any, Any], \n    value_types: tuple = None\n) -> Dict[Any, Union[Any, List[Any]]]:\n    \"\"\"\u578b\u30c1\u30a7\u30c3\u30af\u4ed8\u304d\u8f9e\u66f8\u53cd\u8ee2\"\"\"\n    \n    if value_types is None:\n        value_types = (str, int, float, bool, tuple)\n    \n    reversed_dict = {}\n    skipped = []\n    \n    for key, value in dictionary.items():\n        # \u6307\u5b9a\u3055\u308c\u305f\u578b\u304b\u30c1\u30a7\u30c3\u30af\n        if not isinstance(value, value_types):\n            skipped.append((key, value, type(value).__name__))\n            continue\n            \n        # \u30cf\u30c3\u30b7\u30e5\u53ef\u80fd\u304b\u30c1\u30a7\u30c3\u30af\n        try:\n            hash(value)\n            reversed_dict[value] = key\n        except TypeError:\n            skipped.append((key, value, \"unhashable\"))\n    \n    if skipped:\n        print(f\"\u30b9\u30ad\u30c3\u30d7\u3055\u308c\u305f\u9805\u76ee ({len(skipped)}\u4ef6):\")\n        for key, value, reason in skipped:\n            print(f\"  {key}: {value} ({reason})\")\n    \n    return reversed_dict\n\n# \u4f7f\u7528\u4f8b\nmixed_data = {\n    'name': '\u592a\u90ce',\n    'age': 25, \n    'scores': [85, 92, 78],  # \u30ea\u30b9\u30c8\uff08\u30b9\u30ad\u30c3\u30d7\uff09\n    'active': True,\n    'config': {'debug': True}  # \u8f9e\u66f8\uff08\u30b9\u30ad\u30c3\u30d7\uff09\n}\n\nresult = typed_reverse_dict(mixed_data, (str, int, bool))\nprint(\"\u7d50\u679c:\", result)\n<\/code><\/pre>\n
\u5b9f\u7528\u7684\u306a\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u95a2\u6570<\/h2>\n
\u53cc\u65b9\u5411\u8f9e\u66f8\u30af\u30e9\u30b9<\/h3>\n
class BiDict:\n    \"\"\"\u53cc\u65b9\u5411\u8f9e\u66f8\u30af\u30e9\u30b9\"\"\"\n    \n    def __init__(self, initial_dict=None):\n        self.forward = initial_dict.copy() if initial_dict else {}\n        self.reverse = {v: k for k, v in self.forward.items()}\n    \n    def set(self, key, value):\n        \"\"\"\u30ad\u30fc\u30fb\u5024\u306e\u30da\u30a2\u3092\u8a2d\u5b9a\"\"\"\n        # \u65e2\u5b58\u306e\u9006\u65b9\u5411\u30de\u30c3\u30d4\u30f3\u30b0\u3092\u524a\u9664\n        if key in self.forward:\n            old_value = self.forward[key]\n            del self.reverse[old_value]\n        \n        if value in self.reverse:\n            old_key = self.reverse[value]\n            del self.forward[old_key]\n        \n        self.forward[key] = value\n        self.reverse[value] = key\n    \n    def get_by_key(self, key):\n        \"\"\"\u30ad\u30fc\u304b\u3089\u5024\u3092\u53d6\u5f97\"\"\"\n        return self.forward.get(key)\n    \n    def get_by_value(self, value):\n        \"\"\"\u5024\u304b\u3089\u30ad\u30fc\u3092\u53d6\u5f97\"\"\"\n        return self.reverse.get(value)\n    \n    def remove_by_key(self, key):\n        \"\"\"\u30ad\u30fc\u3067\u30da\u30a2\u3092\u524a\u9664\"\"\"\n        if key in self.forward:\n            value = self.forward[key]\n            del self.forward[key]\n            del self.reverse[value]\n    \n    def __str__(self):\n        return f\"BiDict({self.forward})\"\n\n# \u4f7f\u7528\u4f8b\nbd = BiDict({'apple': '\u308a\u3093\u3054', 'banana': '\u30d0\u30ca\u30ca'})\nprint(bd.get_by_key('apple'))      # '\u308a\u3093\u3054'\nprint(bd.get_by_value('\u30d0\u30ca\u30ca'))    # 'banana'\n\nbd.set('orange', '\u30aa\u30ec\u30f3\u30b8')\nprint(bd)  # BiDict({'apple': '\u308a\u3093\u3054', 'banana': '\u30d0\u30ca\u30ca', 'orange': '\u30aa\u30ec\u30f3\u30b8'})\n<\/code><\/pre>\n
\u6761\u4ef6\u4ed8\u304d\u53cd\u8ee2\u95a2\u6570<\/h3>\n
def conditional_reverse(dictionary, condition=None, transform=None):\n    \"\"\"\u6761\u4ef6\u4ed8\u304d\u8f9e\u66f8\u53cd\u8ee2\"\"\"\n    if condition is None:\n        condition = lambda k, v: True\n    \n    if transform is None:\n        transform = lambda k, v: (v, k)\n    \n    result = {}\n    for key, value in dictionary.items():\n        if condition(key, value):\n            new_key, new_value = transform(key, value)\n            try:\n                hash(new_key)  # \u30cf\u30c3\u30b7\u30e5\u53ef\u80fd\u304b\u30c1\u30a7\u30c3\u30af\n                result[new_key] = new_value\n            except TypeError:\n                print(f\"\u8b66\u544a: {new_key} \u306f\u30cf\u30c3\u30b7\u30e5\u4e0d\u53ef\u80fd\u306e\u305f\u3081\u30b9\u30ad\u30c3\u30d7\")\n    \n    return result\n\n# \u4f7f\u7528\u4f8b\ndata = {'name': '\u592a\u90ce', 'age': 25, 'score': 85, 'active': True}\n\n# \u6570\u5024\u306e\u307f\u53cd\u8ee2\nnumeric_only = conditional_reverse(\n    data,\n    condition=lambda k, v: isinstance(v, (int, float)),\n    transform=lambda k, v: (v, k.upper())\n)\nprint(numeric_only)  # {25: 'AGE', 85: 'SCORE'}\n<\/code><\/pre>\n
\u307e\u3068\u3081<\/h2>\n
Python\u8f9e\u66f8\u306e\u30ad\u30fc\u3068\u5024\u306e\u5165\u308c\u66ff\u3048\u306f\u3001\u30c7\u30fc\u30bf\u51e6\u7406\u306b\u304a\u3044\u3066\u975e\u5e38\u306b\u91cd\u8981\u306a\u6280\u8853\u3067\u3059\u3002\u9069\u5207\u306a\u65b9\u6cd5\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u3067\u5b89\u5168\u306a\u51e6\u7406\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u57fa\u672c\u7684\u306a\u53cd\u8ee2\u624b\u6cd5<\/strong><\/p>\n