{"id":323,"date":"2017-02-17T16:58:22","date_gmt":"2017-02-17T07:58:22","guid":{"rendered":"http:\/\/www.python.ambitious-engineer.com\/?p=323"},"modified":"2021-11-07T12:30:53","modified_gmt":"2021-11-07T03:30:53","slug":"%e3%83%97%e3%83%a9%e3%82%a4%e3%83%99%e3%83%bc%e3%83%88%e3%83%a1%e3%83%b3%e3%83%90","status":"publish","type":"post","link":"https:\/\/www.python.ambitious-engineer.com\/archives\/323","title":{"rendered":"\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30e1\u30f3\u30d0"},"content":{"rendered":"

\u6163\u7fd2\u7684\u306a\u547d\u540d\u898f\u5247\u306b\u3088\u308b\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30e1\u30f3\u30d0<\/h2>\n

\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3068\u306f\u3001\u751f\u6210\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30e1\u30f3\u30d0\uff08\u5909\u6570\u3084\u30e1\u30bd\u30c3\u30c9\uff09\u306b\u5bfe\u3057\u3066\u5916\u90e8\u304b\u3089\u306e\u53c2\u7167\u3084\u66f4\u65b0\u3092\u5236\u5fa1\u3059\u308b\u305f\u3081\u306e\u4fee\u98fe\u5b50\u306e\u3053\u3068\u3067\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u304c\u53ef\u80fd\u306a\u8a00\u8a9e\u306e\u591a\u304f\u3067\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308b\u6a5f\u80fd\u306a\u306e\u3067\u3059\u304c\u3001\u4ee5\u524d\u306e\u30da\u30fc\u30b8<\/a>\u3067\u66f8\u3044\u305f\u3068\u304a\u308a\u3001Python\u306b\u306f\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u306e\u304b\u308f\u308a\u3001\u6163\u7fd2\u7684\u306b\u30a2\u30f3\u30c0\u30fc\u30b9\u30b3\u30a2\u3067\u59cb\u307e\u308b\u540d\u524d (\u4f8b\u3048\u3070_x\u306a\u3069)\u306e\u30e1\u30f3\u30d0\u306f\u3001\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u30e1\u30f3\u30d0\u3068\u307f\u306a\u3057\u307e\u3059<\/strong>\u3002\u305f\u3060\u3057\u3001\u3042\u304f\u307e\u3067\u3082\u300c\u305d\u3046\u307f\u306a\u3059\u300d\u3068\u3044\u3046\u3060\u3051\u306a\u306e\u3067\u5916\u90e8\u304b\u3089\u306e\u30a2\u30af\u30bb\u30b9\u81ea\u4f53\u306f\u53ef\u80fd\u3067\u3059\u3002<\/p>\n

\u4ee5\u4e0b\u3001\u4ed6\u306e\u8a00\u8a9e\u306b\u99b4\u67d3\u307f\u306e\u306a\u3044\u65b9\u5411\u3051\u306b\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u306b\u95a2\u3057\u3066\u88dc\u8db3\u3057\u307e\u3059\u3002<\/p>\n

\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001User\u578b\u306e\u5909\u6570name\u3001_age\u3092\u76f4\u63a5\u66f4\u65b0\u3057\u3066\u3044\u307e\u3059\u3002_age\u306fprivate\u3068\u307f\u306a\u3057\u307e\u3059\u304c\u3001\u5916\u90e8\u304b\u3089\u66f4\u65b0\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n

\r\nclass User:\r\n    """\r\n    \u30e6\u30fc\u30b6\u30fc\u30af\u30e9\u30b9\r\n    """\r\n\r\n    def __init__(self, name="", age=0):\r\n        self.name = name  # name\u306f\u516c\u958b\r\n        self._age = age  # age\u306fprivate\u3068\u307f\u306a\u3059\r\n\r\n\r\nuser = User("Yamada", 45)\r\nuser.name = "Yoshida"\r\nuser._age = 39  # \u666e\u901a\u306b\u5916\u90e8\u304b\u3089\u66f4\u65b0\u53ef\u80fd\r\n\r\n<\/pre>\n
\u4e00\u65b9\u3001\u4ee5\u4e0b\u306fJava\u306e\u30b3\u30fc\u30c9\u3067\u3059\u3002\u540c\u69d8\u306e\u51e6\u7406\u3067\u3059\u304c\u3001private\u3068\u66f8\u304b\u308c\u3066\u3044\u308b\u30e1\u30f3\u30d0\u3092\u5916\u90e8\u304b\u3089\u53c2\u7167\u3057\u305f\u308a\u66f4\u65b0\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n
\r\n\r\npublic class User {\r\n\t\r\n\t  public String name;\r\n\t  private int age;\r\n\r\n\t  public User(String name, int age){\r\n\t\t  this.name = name;\r\n\t\t  this.age = age;\r\n\t  }\r\n\r\n}\r\n\r\npublic class Main {\r\n\tpublic static void main(String[] args) {\r\n\t\tUser user = new User("Yamada", 45);\r\n\t\tuser.name = "Yoshida";\r\n\t\tuser.age = 39;\r\n\t}\r\n}\r\n<\/pre>\n
\u4e0a\u306e\u30b3\u30fc\u30c9\u306fUser\u30af\u30e9\u30b9\u306bname\u3001age\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002name\u306fpublic\u3068\u3044\u3046\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u304a\u308a\u3001\u5916\u90e8\u304b\u3089\u53c2\u7167\u30fb\u66f4\u65b0\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002\u5b9f\u969b\u300116\u884c\u76ee\u3067name\u3092Yoshida\u306b\u66f4\u65b0\u3057\u3066\u3044\u307e\u3059\u3002\u4e00\u65b9\u3001age\u306fprivate\u3068\u3044\u3046\u5916\u90e8\u304b\u3089\u306e\u66f4\u65b0\u3092\u4e0d\u8a31\u53ef\u306b\u3059\u308b\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u304a\u308a\u300117\u884c\u76ee\u306e\u66f4\u65b0\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u5927\u898f\u6a21\u958b\u767a\u3092\u884c\u3046\u969b\u3001\u4ed6\u306e\u958b\u767a\u8005\u304c\u5916\u90e8\u304b\u3089\u52dd\u624b\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u3092\u66f4\u65b0\u3059\u308b\u3088\u3046\u306a\u4e8b\u6545\u304c\u591a\u3005\u767a\u751f\u3059\u308b\u306e\u3067\u3059\u304c\u3001\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3092\u9069\u5207\u306b\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u3053\u3046\u3044\u3063\u305f\u4e0d\u5177\u5408\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
__\u5909\u6570\u540d\u306b\u3088\u308b\u96a0\u853d<\/h2>\n
\u305f\u3060\u3057Python\u306e\u30af\u30e9\u30b9\u306f\u300c\u30a2\u30f3\u30c0\u30fc\u30b9\u30b3\u30a22\u3064\u3067\u59cb\u307e\u308a\u3001\u672b\u5c3e\u304c\u30a2\u30f3\u30c0\u30fc\u30b9\u30b3\u30a21\u3064\u4ee5\u4e0b\u300d\u3068\u306a\u308b\u5909\u6570\u540d\u306e\u5834\u5408\u3001\u305d\u306e\u5909\u6570\u306b\u5bfe\u3057\u3066\u5916\u90e8\u304b\u3089\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3068AttributeError\u3092\u767a\u751f\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u4ed5\u7d44\u307f\u306b\u3088\u308a\u5b9f\u8cea\u7684\u306a\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u30e1\u30f3\u30d0\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\r\nclass Sample():\r\n    def __init__(self):\r\n        self.a = 0\r\n        self._b = 0\r\n        self.__c = 0\r\n        self.__d_ = 0\r\n        self.__e__ = 0\r\n\r\n\r\nobj = Sample()\r\na = obj.a # \u30a2\u30af\u30bb\u30b9\u53ef\u80fd\r\nb = obj._b # \u30a2\u30af\u30bb\u30b9\u53ef\u80fd\r\nc = obj.__c # AttributeError\u767a\u751f\r\nd = obj.__d_ # AttributeError\u767a\u751f\r\ne = obj.__e__ # \u30a2\u30af\u30bb\u30b9\u53ef\u80fd\r\n<\/pre>\n
\u4e0a\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001a\u3001_b\u306f\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u3067\u3059\u3002_b\u306f\u30a2\u30f3\u30c0\u30fc\u30b9\u30b3\u30a2\u304b\u3089\u59cb\u307e\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u30a2\u30af\u30bb\u30b9\u3067\u304d\u3066\u3057\u307e\u3046\u70b9\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u307e\u305f\u3001__c\u3001__d_\u306f\u5916\u90e8\u304b\u3089\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3068\u3001AttributeError\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n
\u305f\u3060\u3057\u30012\u3064\u4ee5\u4e0a\u306e\u30a2\u30f3\u30c0\u30fc\u30b9\u30b3\u30a2\u3067\u7d42\u308f\u308b\u30e1\u30f3\u30d0\u306f\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30e1\u30f3\u30d0\u3068\u306f\u306a\u308a\u307e\u305b\u3093\u3002\uff08__init__\u306a\u3069\u306f\u7279\u6b8a\u30e1\u30bd\u30c3\u30c9\u3068\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002\u5225\u30da\u30fc\u30b8<\/a>\u306b\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002\uff09\u3053\u306e\u305f\u3081\u3001__e__\u306f\u540d\u524d\u306e\u672b\u5c3e\u304c\u30a2\u30f3\u30c0\u30fc\u30b9\u30b3\u30a22\u3064\u3067\u7d42\u308f\u308b\u306e\u3067\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\u3068\u306f\u3044\u3048\u3001\u524d\u8ff0\u306e\u901a\u308a\u3001\u5b8c\u5168\u306a\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u5909\u6570\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u3002\u5b9f\u306f\u4ee5\u4e0b\u306e\u65b9\u6cd5\u3088\u308a\u30a2\u30af\u30bb\u30b9\u3067\u304d\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n
\r\nc = obj._Sample__c # \u30a2\u30af\u30bb\u30b9\u3067\u304d\u3066\u3057\u307e\u3046\r\n<\/pre>\n
\u3053\u306e\u539f\u7406\u306f\u30de\u30f3\u30b0\u30ea\u30f3\u30b0\u3068\u547c\u3070\u308c\u3001\u8a73\u3057\u304f\u306f\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u4ee5\u4e0b\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\nhttps:\/\/docs.python.org\/3\/tutorial\/classes.html<\/a>\u3088\u308a\u5f15\u7528
\n\u30af\u30e9\u30b9\u306e\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30e1\u30f3\u30d0\u306b\u3064\u3044\u3066\u9069\u5207\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9(\u7279\u306b\u30b5\u30d6\u30af\u30e9\u30b9\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u540d\u524d\u3068\u306e\u885d\u7a81\u3092\u907f\u3051\u308b\u5834\u5408)\u304c\u3042\u308b\u306e\u3067\u3001\u30de\u30f3\u30b0\u30ea\u30f3\u30b0(name mangling) \u3068\u547c\u3070\u308c\u308b\u3001\u9650\u5b9a\u3055\u308c\u305f\u30b5\u30dd\u30fc\u30c8\u6a5f\u69cb\u304c\u3042\u308a\u307e\u3059\u3002 __spam (\u5148\u982d\u306b\u4e8c\u500b\u4ee5\u4e0a\u306e\u4e0b\u7dda\u6587\u5b57\u3001\u672b\u5c3e\u306b\u4e00\u500b\u4ee5\u4e0b\u306e\u4e0b\u7dda\u6587\u5b57) \u3068\u3044\u3046\u5f62\u5f0f\u306e\u8b58\u5225\u5b50\u306f\u3001 _classname__spam \u3078\u3068\u30c6\u30ad\u30b9\u30c8\u7f6e\u63db\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u3053\u3053\u3067 classname \u306f\u3001\u73fe\u5728\u306e\u30af\u30e9\u30b9\u540d\u304b\u3089\u5148\u982d\u306e\u4e0b\u7dda\u6587\u5b57\u3092\u306f\u304e\u3068\u3063\u305f\u540d\u524d\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u96e3\u53f7\u5316 (mangle) \u306f\u3001\u8b58\u5225\u5b50\u306e\u6587\u6cd5\u7684\u306a\u4f4d\u7f6e\u306b\u304b\u304b\u308f\u3089\u305a\u884c\u308f\u308c\u308b\u306e\u3067\u3001\u30af\u30e9\u30b9\u5b9a\u7fa9\u5185\u306b\u73fe\u308c\u305f\u8b58\u5225\u5b50\u5168\u3066\u306b\u5bfe\u3057\u3066\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u540d\u524d\u306e\u30de\u30f3\u30b0\u30ea\u30f3\u30b0\u306f\u3001\u30b5\u30d6\u30af\u30e9\u30b9\u304c\u5185\u90e8\u306e\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u3092\u58ca\u3055\u305a\u306b\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u306e\u306b\u4fbf\u5229\u3067\u3059\u3002\n<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"
\u6163\u7fd2\u7684\u306a\u547d\u540d\u898f\u5247\u306b\u3088\u308b\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30e1\u30f3\u30d0 \u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3068\u306f\u3001\u751f\u6210\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30e1\u30f3\u30d0\uff08\u5909\u6570\u3084\u30e1\u30bd\u30c3\u30c9\uff09\u306b\u5bfe\u3057\u3066\u5916\u90e8\u304b\u3089\u306e\u53c2\u7167\u3084\u66f4\u65b0\u3092\u5236\u5fa1\u3059\u308b\u305f\u3081\u306e\u4fee\u98fe\u5b50\u306e\u3053\u3068\u3067\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u304c\u53ef\u80fd\u306a\u8a00\u8a9e\u306e\u591a\u304f...<\/p>\n","protected":false},"author":1,"featured_media":3677,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[103],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.python.ambitious-engineer.com\/wp-json\/wp\/v2\/posts\/323"}],"collection":[{"href":"https:\/\/www.python.ambitious-engineer.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.python.ambitious-engineer.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.python.ambitious-engineer.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.python.ambitious-engineer.com\/wp-json\/wp\/v2\/comments?post=323"}],"version-history":[{"count":10,"href":"https:\/\/www.python.ambitious-engineer.com\/wp-json\/wp\/v2\/posts\/323\/revisions"}],"predecessor-version":[{"id":3678,"href":"https:\/\/www.python.ambitious-engineer.com\/wp-json\/wp\/v2\/posts\/323\/revisions\/3678"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.python.ambitious-engineer.com\/wp-json\/wp\/v2\/media\/3677"}],"wp:attachment":[{"href":"https:\/\/www.python.ambitious-engineer.com\/wp-json\/wp\/v2\/media?parent=323"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.python.ambitious-engineer.com\/wp-json\/wp\/v2\/categories?post=323"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.python.ambitious-engineer.com\/wp-json\/wp\/v2\/tags?post=323"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}