{"id":21929,"date":"2023-07-08T10:13:17","date_gmt":"2023-07-08T01:13:17","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=21929"},"modified":"2023-07-10T23:34:25","modified_gmt":"2023-07-10T14:34:25","slug":"%e3%80%90python%e3%80%91%e3%82%b7%e3%83%b3%e3%82%b0%e3%83%ab%e3%83%88%e3%83%b3","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=21929","title":{"rendered":"\u3010Python\u3011\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u306e\u5b9f\u88c5"},"content":{"rendered":"\n

\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u6642\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6307\u5b9a\u3055\u308c\u3066\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u4e00\u3064\u3057\u304b\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u306b\u306f\u30e1\u30e2\u30ea\u304c\u5fc5\u8981\u3067\u4f5c\u6210\u306b\u82e5\u5e72\u6642\u9593\u3092\u8981\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u3092\u4f7f\u3048\u3070\u540c\u3058\u30d7\u30ed\u30bb\u30b9\u5185\u3067\u3042\u308c\u3070\u518d\u5ea6\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u751f\u6210\u3055\u308c\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n

\u4f7f\u7528\u4f8b<\/h2>\n\n\n\n

\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3078\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3081\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9<\/h3>\n\n\n\n

\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306eURL\u3001ID\u3001\u30d1\u30b9\u30ef\u30fc\u30c9\u306a\u3069\u3092\u4fdd\u6301\u3057\u307e\u3059\u3002\u3053\u3046\u3044\u3046\u306e\u306f\u8ab0\u304c\u4f7f\u3046\u306b\u3057\u3066\u3082\u540c\u3058\u60c5\u5831\u306a\u306e\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u4e00\u3064\u3057\u304b\u5fc5\u8981\u306a\u3044\u3067\u3059\u3002<\/p>\n\n\n\n

Object\u3092\u4f5c\u6210\u3059\u308bFactory<\/h3>\n\n\n\n

\u4f5c\u6210\u3055\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5074\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u4eba\u306b\u3088\u3063\u3066\u5206\u3051\u3089\u308c\u308b\u306e\u306f\u666e\u901a\u3067\u3059\u304c\u3001\u4f5c\u6210\u3059\u308b\u5074\u306eFactory\u30af\u30e9\u30b9\u306e\u65b9\u306f\u4e00\u3064\u3067\u554f\u984c\u306a\u3044\u3067\u3059\u3002<\/p>\n\n\n\n

\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u3058\u3083\u306a\u3044\u5b9f\u88c5<\/h2>\n\n\n\n
class NonSingleTon:\n    pass\n\n\na = NonSingleTon()\nb = NonSingleTon()\n\nprint(a == b)\n # False<\/code><\/pre>\n\n\n\n
\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u306a\u5b9f\u88c5<\/h2>\n\n\n\n
\u3082\u3057\u3001\u5024\u3092\u8a2d\u5b9a\u3057\u305f\u3044\u5834\u5408\u306fsetter\u3092\u4f7f\u3063\u3066\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u305f\u3060\u3001\u3053\u306e\u66f8\u304d\u65b9\u3060\u3068super\u306a\u3069\u306e\u69cb\u6587\u304c\u51fa\u3066\u304d\u3066\u30a4\u30de\u30a4\u30c1\u30bd\u30fc\u30b9\u306e\u5185\u5bb9\u304c\u5206\u304b\u308a\u3065\u3089\u3044\u3068\u3044\u3046\u30c7\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
class SingleTon:\n    _instance = None\n\n    def __init__(self):\n        self.__url = None\n\n    def __new__(cls):\n        if cls._instance is None:\n            cls._instance = super().__new__(cls)\n        return cls._instance\n\n    @property\n    def url(self):\n        return self.__url\n\n    @url.setter\n    def url(self, url):\n        self.__url = url\n\n\na = SingleTon()\nb = SingleTon()\nprint(a == b) # True<\/code><\/pre>\n\n\n\n
__new__<\/h3>\n\n\n\n
\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3057\u305f\u6642\u306b\u547c\u3070\u308c\u307e\u3059\u3002\u6700\u521d\u306b\u547c\u3073\u51fa\u3057\u305f\u5834\u5408\u306f_instance\u304cNone\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u751f\u6210\u3057\u3066\u8fd4\u3057\u307e\u3059\u30022\u56de\u76ee\u306b\u547c\u3073\u51fa\u3057\u305f\u5834\u5408\u306f\u65e2\u5b58\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u306a\u5b9f\u88c5\uff12<\/h2>\n\n\n\n
Java\u306a\u3069\u306e\u307b\u304b\u306e\u8a00\u8a9e\u306e\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u672c\u3067\u4f7f\u308f\u308c\u3066\u3044\u308b\u66f8\u304d\u65b9\u3067\u3059\u3002Java\u3067\u306f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092private\u306b\u3059\u308b\u3053\u3068\u3067\u76f4\u63a5new\u3059\u308b\u306e\u3092\u9632\u304e\u307e\u3059\u304c\u3001Python\u3067\u306f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u306a\u3044\u306e\u3067\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u5229\u7528\u3057\u305f\u5834\u5408\u306f\u30a8\u30e9\u30fc\u3092\u8fd4\u3059\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
class Singleton:\n    __instance = None\n\n    def __init__(self):\n        raise RuntimeError(\"\u3053\u306e\u30af\u30e9\u30b9\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306f\u547c\u3073\u51fa\u305b\u307e\u305b\u3093\")\n\n    @classmethod\n    def get_instance(cls, url=None):\n        if cls.__instance is None:\n            cls.__instance = cls.__new__(cls)\n        if url:\n            cls.__instance.__url = url\n        return cls.__instance\n\n    @property\n    def url(self):\n        return self.__url\n\n    @url.setter\n    def url(self, url):\n        self.__url = url\n\n\na = Singleton.get_instance(\"htp:\/\/aaa\")\nb = Singleton.get_instance()\nprint(a == b)\nprint(id(a), id(b))\nprint(a.url, b.url)\na.url = \"http:\/\/bbb\"\nprint(a.url, b.url)\n<\/code><\/pre>\n\n\n\n
<\/h2>\n","protected":false},"excerpt":{"rendered":"\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u6642\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6307\u5b9a\u3055\u308c\u3066\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u4e00\u3064\u3057\u304b\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u306b\u306f\u30e1\u30e2\u30ea\u304c\u5fc5\u8981\u3067\u4f5c\u6210\u306b\u82e5\u5e72\u6642\u9593\u3092\u8981\u3057\u307e\u3059\u3002 \u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u3092\u4f7f\u3048\u3070\u540c\u3058\u30d7\u30ed\u30bb\u30b9\u5185\u3067\u3042\u308c\u3070\u518d\u5ea6\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u751f\u6210\u3055\u308c\u306a […]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[47,21],"tags":[],"_links":{"self":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/21929"}],"collection":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=21929"}],"version-history":[{"count":3,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/21929\/revisions"}],"predecessor-version":[{"id":21949,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/21929\/revisions\/21949"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=21929"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21929"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21929"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}