{"id":9509,"date":"2022-09-19T07:38:03","date_gmt":"2022-09-19T02:08:03","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-why-do-i-get-different-results-when-using-hasattr-function-on-the-class-and-its-object-for-the-same-attribute-closed\/"},"modified":"2022-09-19T07:38:03","modified_gmt":"2022-09-19T02:08:03","slug":"solved-why-do-i-get-different-results-when-using-hasattr-function-on-the-class-and-its-object-for-the-same-attribute-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-why-do-i-get-different-results-when-using-hasattr-function-on-the-class-and-its-object-for-the-same-attribute-closed\/","title":{"rendered":"[Solved] Why do I get different results when using ‘hasattr’ function on the class and its object for the same attribute? [closed]"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

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<\/div>\n
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Be careful cls<\/code> is typically used for classmethod<\/code>s for example like this:<\/p>\n

class Person:\n    def __init__(self, name, age):\n        self.name = name\n        self.age = age\n\n    @classmethod\n    def fromBirthYear(cls, name, birthYear):\n        return cls(name, date.today().year - birthYear)\n<\/code><\/pre>\n
So it is better to not use it for your own class names to avoid confusion.<\/p>\n
Comming to your question.
\nIn your first block you use a reference to the class itself. So here only static variables are visible as __init__<\/code> has not been called.<\/p>\n
>>> print(hasattr(cls1,'A'))\nTrue\n>>> print(hasattr(cls1,'a'))\nFalse\n<\/code><\/pre>\n
In the second block you use an instance of the class. Here, __init__()<\/code> was executed and therefore obj.a<\/code> exists.<\/p>\n
>>> obj=cls1()\n>>> print(hasattr(obj,'A'))\nTrue\n>>> print(hasattr(obj,'a'))\nTrue\n<\/code><\/pre>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            3<\/span> <\/p><\/div>\n<\/div>\n
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solved Why do I get different results when using ‘hasattr’ function on the class and its object for the same attribute? [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Be careful cls is typically used for classmethods for example like this: class Person: def __init__(self, name, age): self.name = name self.age = age @classmethod def fromBirthYear(cls, name, birthYear): return cls(name, date.today().year – birthYear) So it is better to not use it for your own class names to avoid confusion. Comming to your question. … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[349],"class_list":["post-9509","post","type-post","status-publish","format-standard","hentry","category-solved","tag-python"],"yoast_head":"\n[Solved] Why do I get different results when using 'hasattr' function on the class and its object for the same attribute? [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-why-do-i-get-different-results-when-using-hasattr-function-on-the-class-and-its-object-for-the-same-attribute-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Why do I get different results when using 'hasattr' function on the class and its object for the same attribute? 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