{"id":480,"date":"2019-01-06T21:11:24","date_gmt":"2019-01-06T12:11:24","guid":{"rendered":"https:\/\/www.nblog09.com\/w\/?p=480"},"modified":"2021-06-13T11:00:52","modified_gmt":"2021-06-13T02:00:52","slug":"python-constractor","status":"publish","type":"post","link":"https:\/\/www.nblog09.com\/w\/2019\/01\/06\/python-constractor\/","title":{"rendered":"Python\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf(__init__)\u3001\u30c7\u30b9\u30c8\u30e9\u30af\u30bf(__del__)\u3001__new__\u306b\u3064\u3044\u3066\u8a73\u7d30"},"content":{"rendered":"

\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf(__init__)\u306e\u5229\u7528\u65b9\u6cd5<\/strong><\/h2>\n

\u4ee5\u4e0b\u306e\u6d41\u308c\u3067\u3001\u30af\u30e9\u30b9\u304b\u3089\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u4f5c\u6210\u3055\u308c\u308b\u3002<\/p>\n

\"\"<\/p>\n

\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u521d\u671f\u5316\u3059\u308b\u969b\u306b\u547c\u3073\u51fa\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u8a00\u3044\u3001python\u306e\u5834\u5408__init__\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u304c\u547c\u3073\u51fa\u3055\u308c\u308b\u3002<\/span><\/p>\n

\u4f8b\u3048\u3070\u3001\u30af\u30e9\u30b9\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u521d\u671f\u5316\u306e\u969b\u306b\u7528\u3044\u3089\u308c\u308b\u3002<\/p>\n

\n
    \n
  • \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5b9a\u7fa9<\/li>\n<\/ul>\n
    \nclass SampleClass:
    \n    def __init__(self, msg): # \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf<\/strong>
    \n        print(\"\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u547c\u3073\u51fa\u3055\u308c\u307e\u3057\u305f\")
    \n        self.msg = msg # \u30d7\u30ed\u30d1\u30c6\u30a3msg\u3092\u5f15\u6570msg\u3067\u521d\u671f\u5316<\/strong>
    \n        self.msg2 = \"Message\" # \u521d\u671f\u5024\u3092\u8a2d\u5b9a<\/strong><\/p>\n

        def print_msg(self):
    \n        print(self.msg) # \u30d7\u30ed\u30d1\u30c6\u30a3msg\u3092\u8868\u793a<\/strong><\/p>\n

    sample = SampleClass(\"Hello World\")
    \n# \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u4f5c\u6210\u6642\u306b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf__init__\u3092\u5b9f\u884c
    \n# \"\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u547c\u3073\u51fa\u3055\u308c\u307e\u3057\u305f\"\u3068\u8868\u793a\u5f8c\u3001msg\u306b\"Hello World\", msg2\u306b\"Message\"\u3092\u683c\u7d0d<\/strong><\/p>\n

    sample.print_msg()
    \n# \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9sample\u306eprint_msg\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\u3002\u30d7\u30ed\u30d1\u30c6\u30a3msg\u306f\"Hello World\"\u306a\u306e\u3067\u3001print(self.msg)\u3067\"Hello World\"\u3068\u8868\u793a<\/strong>\n<\/div>\n<\/div>\n

    \u30c7\u30b9\u30c8\u30e9\u30af\u30bf(__del__)\u306e\u5229\u7528\u65b9\u6cd5<\/strong><\/h2>\n

    \u30c7\u30b9\u30c8\u30e9\u30af\u30bf\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u524a\u9664\u3055\u308c\u308b\u969b\u306b\u547c\u3073\u51fa\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308b\u3002
    \npython\u3067\u306f\u3001__del__\u3068\u3057\u3066\u5b9a\u7fa9\u3092\u3059\u308b\u3002<\/p>\n


    \ndef __del__(self):
    \n pass
    \n<\/span><\/p>\n

    \n
      \n
    • \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5b9a\u7fa9<\/li>\n<\/ul>\n
      \nclass DelSample:
      \n    def __del__(self):
      \n        print(\"del\u304c\u547c\u3073\u51fa\u3055\u308c\u307e\u3057\u305f\u3002\") <\/p>\n

      del1 = DelSample()
      \ndel del1
      \n# del \u30a4\u30f3\u30b9\u30bf\u30f3\u540d\u3068\u3059\u308b\u3068\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u524a\u9664\u3055\u308c__del__\u304c\u547c\u3073\u51fa\u3055\u308b\u3002\"del\u304c\u547c\u3073\u51fa\u3055\u308c\u307e\u3057\u305f\u3002\"\u304c\u8868\u793a<\/strong>\n<\/div>\n<\/div>\n

      __new__\u306e\u5229\u7528\u65b9\u6cd5<\/strong><\/h2>\n

      __new__\u306f\u3001\u7279\u6b8a\u30e1\u30bd\u30c3\u30c9\u306e1\u3064\u3067\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u4f5c\u6210\u6642\u306b\u547c\u3073\u51fa\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9<\/span>\u3067\u3042\u308b\u3002
      \n__new__\u306f\u3001\u30b9\u30bf\u30c6\u30a3\u30c3\u30af\u30e1\u30bd\u30c3\u30c9\u3067\u3001cls\u3092\u7b2c\uff11\u5f15\u6570\u306b\u3057\u3066class\u306e\u521d\u671f\u5316\u306e\u305f\u3081\u306b\u5229\u7528\u3055\u308c\u308b\u3002<\/p>\n

      \n
        \n
      • __new__\u306e\u5b9a\u7fa9\u65b9\u6cd5(new\u3067\u81ea\u8eab\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u8fd4\u3059\u3088\u3046\u306b\u3059\u308b\u3068\u305d\u306e\u5f8c\u3001\u305d\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u547c\u3073\u51fa\u3059)<\/li>\n<\/ul>\n
        \nclass MyClass:
        \n    def __new__(cls):
        \n        print(\"new is called\")
        \n        return super().__new__(cls) # \u89aa\u30af\u30e9\u30b9\u306e__new__\u3092\u547c\u3073\u51fa\u3057\u3066\u3001\u8fd4\u308a\u5024\u3092return\u3059\u308b<\/strong><\/p>\n

            def __init__(self): # __new__\u306e\u5f8c\u306b\u547c\u3070\u308c\u308b<\/strong>
        \n        print(\"Init is called\")<\/p>\n

        MyClass() # new is called \u2192 Init is called\u3068\u8868\u793a\u3055\u308c\u308b<\/strong>\n<\/div>\n

          \n
        • __new__\u306e\u5b9a\u7fa9\u65b9\u6cd5(new\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u8fd4\u3059\u3088\u3046\u306b\u3059\u308b\u3068\u305d\u306e\u5f8c\u3001\u305d\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u547c\u3073\u51fa\u3059)<\/li>\n<\/ul>\n
          \nclass MyClass:
          \n    def __new__(cls):
          \n        print(\"new is called\")
          \n        return 'msg' # \u6587\u5b57\u5217\u3092\u8fd4\u3059\u3002__init__\u306f\u305d\u306e\u3042\u3068\u547c\u3073\u51fa\u3055\u308c\u306a\u3044<\/strong><\/p>\n

              def __init__(self): # \u5b9f\u884c\u3055\u308c\u306a\u3044<\/strong>
          \n        self.name='A'
          \n        print(\"Init is called\")<\/p>\n

          MyClass() # new is called\u3068\u8868\u793a<\/strong>\n<\/div>\n<\/div>\n

          <\/div>\n","protected":false},"excerpt":{"rendered":"

          \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf(__init__)\u306e\u5229\u7528\u65b9\u6cd5 \u4ee5\u4e0b\u306e\u6d41\u308c\u3067\u3001\u30af\u30e9\u30b9\u304b\u3089\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u4f5c\u6210\u3055\u308c\u308b\u3002 \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u521d\u671f\u5316\u3059\u308b\u969b\u306b\u547c\u3073\u51fa\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u8a00\u3044\u3001python\u306e\u5834\u5408__init__\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u304c […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_uag_custom_page_level_css":"","_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[9,219],"tags":[],"class_list":{"0":"post-480","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-python","7":"category-it-programming","8":"entry","9":"has-post-thumbnail"},"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"home-middle":false,"home-top":false,"sidebar-thumbnail":false},"uagb_author_info":{"display_name":"9nmatsumoto","author_link":"https:\/\/www.nblog09.com\/w\/author\/9nmatsumoto\/"},"uagb_comment_info":2,"uagb_excerpt":"\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf(__init__)\u306e\u5229\u7528\u65b9\u6cd5 \u4ee5\u4e0b\u306e\u6d41\u308c\u3067\u3001\u30af\u30e9\u30b9\u304b\u3089\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u4f5c\u6210\u3055\u308c\u308b\u3002 \u30aa\u30d6\u30b8\u30a7\u30af\u30c8…","_links":{"self":[{"href":"https:\/\/www.nblog09.com\/w\/wp-json\/wp\/v2\/posts\/480","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nblog09.com\/w\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nblog09.com\/w\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nblog09.com\/w\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nblog09.com\/w\/wp-json\/wp\/v2\/comments?post=480"}],"version-history":[{"count":20,"href":"https:\/\/www.nblog09.com\/w\/wp-json\/wp\/v2\/posts\/480\/revisions"}],"predecessor-version":[{"id":483,"href":"https:\/\/www.nblog09.com\/w\/wp-json\/wp\/v2\/posts\/480\/revisions\/483"}],"wp:attachment":[{"href":"https:\/\/www.nblog09.com\/w\/wp-json\/wp\/v2\/media?parent=480"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nblog09.com\/w\/wp-json\/wp\/v2\/categories?post=480"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nblog09.com\/w\/wp-json\/wp\/v2\/tags?post=480"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}