{"id":30631,"date":"2023-01-16T02:57:35","date_gmt":"2023-01-15T21:27:35","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-global-variables-member-variables-and-instance-variables-in-python-closed\/"},"modified":"2023-01-16T02:57:35","modified_gmt":"2023-01-15T21:27:35","slug":"solved-global-variables-member-variables-and-instance-variables-in-python-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-global-variables-member-variables-and-instance-variables-in-python-closed\/","title":{"rendered":"[Solved] Global variables, member variables and instance variables in Python [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-34370630\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"34370630\" data-parentid=\"34369834\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>You have asked a <em>lot of questions<\/em> under one! I will try to answer each of those \ud83d\ude42<\/p>\n<h3>Variables &#8211; global vs local<\/h3>\n<p>global variables are those ones whose <em>scope is global<\/em>, i.e. available in entire program. <\/p>\n<p>local variables by contrast are those ones which resides in one particular scope, a function, inside a loop, inside a particular condition etc. <\/p>\n<p>Here is the example:<\/p>\n<pre><code>glb_var_1 = \"some value\"\nglb_var_2 = \"some other value\"\n\ndef f1():\n   local_var_1 = \"this is local inside f1\"\n\n   print(\"f1(): We can use here all variables defined locally, i.e. inside f1():\", local_var_1)\n   print(\"f1(): We can use global var anywhere in program:\", glb_var_1)\n\ndef f2():\n   local_var_1 = \"this is local inside f2\"\n   glb_var_1   = \"this is local variable which is hiding global var of same name\"\n\n   print(\"f2(): locally inside f2():\", local_var_1)\n   print(\"f2(): same name as global var, but local to f2():\", glb_var_1)\n\ndef f3():\n    print(\"f3(): global var value would be one defined globally, not the one as defined in f2():\", glb_var_1)\n<\/code><\/pre>\n<p>Infact, in Python there are functions which gives you list of all global variables and local variables defined.<br \/>\nThose functions are: <\/p>\n<p><code>globals()<\/code> and <code>locals()<\/code> respectively<\/p>\n<h3>member variables<\/h3>\n<p><em>member variables<\/em> are simply those variables which are defined <em>inside a class<\/em>.<br \/>\nThese variables can be used anywhere within the class&#8217;s methods or from class&#8217;s object name.<\/p>\n<p>Below example would make this clear:<\/p>\n<pre><code>class SomeClass(object):\n\n    def __init__(self):\n        self.member_var_1 = \"some value\"\n        self.member_var_2 = \"some other value\"\n\n    def method1(self):\n        print(\"Could use any member variables here:\", self.member_var_1)\n        self.member_var_1 = \"new value\"\n\n    def method2(self):\n        print(\"If this method is called after method1, we will get new value:\", self.member_var_1)\n\n# create object\/instance of SomeClass\nobj = SomeClass()\n\n# could also use member variables like below\nobj.member_var_1 = \"new value modified outside method\"\n\n# similar to how we call the method of a class\nobj.method2()\n<\/code><\/pre>\n<h3>class variables vs instance variables<\/h3>\n<p>The member variables which we saw in above code listing, are nothing but instance variables.<br \/>\n<em>class variables<\/em> are those variables which are available at class level. What this mean is, it would be same for all instances of that class.<br \/>\nWe could also use class variable irrespective of any class instance. <\/p>\n<p>Following example would explain it better:<\/p>\n<pre><code>class SomeClass(object):\n\n    class_var_1 = \"some value\"\n    class_var_2 = \"some other value\"\n\n    def some_method(self):\n        print(\"Could use all class members, but need to use special syntax:\", SomeClass.class_var_1)\n\nprint(\"Outside class method, no instance created, still can use class member:\",  SomeClass.class_var_1)\nobj = SomeClass()\nobj.some_method()\n<\/code><\/pre>\n<p>I hope you got the idea now \ud83d\ude42<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Global variables, member variables and instance variables in Python [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You have asked a lot of questions under one! I will try to answer each of those \ud83d\ude42 Variables &#8211; global vs local global variables are those ones whose scope is global, i.e. available in entire program. local variables by contrast are those ones which resides in one particular scope, a function, inside a &#8230; <a title=\"[Solved] Global variables, member variables and instance variables in Python [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-global-variables-member-variables-and-instance-variables-in-python-closed\/\" aria-label=\"More on [Solved] Global variables, member variables and instance variables in Python [closed]\">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":[2450,2501,349,455,366],"class_list":["post-30631","post","type-post","status-publish","format-standard","hentry","category-solved","tag-global-variables","tag-instance-variables","tag-python","tag-ruby","tag-variables"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Global variables, member variables and instance variables in Python [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-global-variables-member-variables-and-instance-variables-in-python-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Global variables, member variables and instance variables in Python [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You have asked a lot of questions under one! 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