{"id":36714,"date":"2023-02-04T15:56:07","date_gmt":"2023-02-04T15:56:07","guid":{"rendered":"https:\/\/naiveskill.com\/?p=36714"},"modified":"2023-02-04T15:56:11","modified_gmt":"2023-02-04T15:56:11","slug":"python-__new__","status":"publish","type":"post","link":"https:\/\/naiveskill.com\/python-__new__\/","title":{"rendered":"python __new__ method with examples in 2023"},"content":{"rendered":"\n<p>In this blog, we will learn everything about the <strong>python __new__<\/strong> method. We will understand the python __new__ method with various examples. so let&#8217;s get started.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is python __new__ method<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"256\" src=\"https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__-1-1024x256.webp\" alt=\"python __new__\" class=\"wp-image-36810\" srcset=\"https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__-1-1024x256.webp 1024w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__-1-300x75.webp 300w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__-1-768x192.webp 768w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__-1-150x38.webp 150w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__-1.webp 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>In <a href=\"https:\/\/www.python.org\/\" data-type=\"URL\" data-id=\"https:\/\/www.python.org\/\" target=\"_blank\" rel=\"noopener\">Python<\/a>, the <strong>new<\/strong> method is a special method that is called when a new instance of a class is created. The new method is responsible for allocating memory for the new object and returning the new object.<\/p>\n\n\n\n<p>The __new__ method is used to control the creation of a new instance of a class. It is a static method that takes the class of which an instance was requested as its first argument<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Syntax of python __new__ function<\/h3>\n\n\n\n<p>Below is the syntax for the <strong>new<\/strong> method in Python:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class MyClass:\n    def __new__(cls, *args, **kwargs):\n        # Custom code to create and return a new instance of the class\n        instance = super().__new__(cls)\n        return instance<\/pre>\n\n\n\n<p>The <strong>new<\/strong> method takes the following arguments:<\/p>\n\n\n\n<ul>\n<li><strong>cls<\/strong>: the class being instantiated.<\/li>\n\n\n\n<li><strong>*args<\/strong>: any positional arguments.<\/li>\n\n\n\n<li><strong>**kwargs<\/strong>: any keyword arguments.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Example of python __new__ method<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"256\" src=\"https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/Example-of-python-__new__-method-1024x256.webp\" alt=\"Example of python __new__ method\" class=\"wp-image-36809\" srcset=\"https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/Example-of-python-__new__-method-1024x256.webp 1024w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/Example-of-python-__new__-method-300x75.webp 300w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/Example-of-python-__new__-method-768x192.webp 768w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/Example-of-python-__new__-method-150x38.webp 150w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/Example-of-python-__new__-method.webp 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Below is a simple example of how to use the <strong>new<\/strong> method in python:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class TestClass:\n    def __new__(cls, *args, **kwargs):\n        print(\"Creating new instance\")\n        instance = super().__new__(cls)\n        return instance\n\n# Create a new instance of MyClass\nobj = TestClass()<\/pre>\n\n\n\n<p>The <strong>new<\/strong> method of the TestClass class is called before the object is created. The <strong>new<\/strong> method prints a message indicating that a new instance is being created and then calls the <strong>new<\/strong> method of the parent class to allocate memory for the new object. Finally, it returns the newly created object.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"214\" src=\"https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/01\/image-36.png\" alt=\"Example of python __new__ method\" class=\"wp-image-36720\" srcset=\"https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/01\/image-36.png 600w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/01\/image-36-300x107.png 300w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/01\/image-36-150x54.png 150w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">python __new__ with arguments<\/h2>\n\n\n\n<p>We can also use the python <strong>new<\/strong> class with arguments. Below is an example of how you might it:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class TestClass:\n    def __new__(cls, arg1, *args, **kwargs):\n        print(\"Creating new instance\")\n        # Allocate memory for the new object\n        instance = super().__new__(cls)\n        # Set the value on the instance\n        instance.value = arg1\n        # Return the new object\n        return instance\n    \n    def __init__(self, *args, **kwargs):\n        print(f\"The value of instance is:{self.value}\")\n\n# Create a new instance of MyClass\nobj = TestClass(10)<\/pre>\n\n\n\n<p>In the above example, the <strong>new<\/strong> method of the TestClass class is called before the object is created. The <strong>new<\/strong> method takes an additional argument arg1 and uses it to set the value attribute on the newly created instance.<\/p>\n\n\n\n<p>After the object has been created, the <strong>init<\/strong> method of the TestClass class is called. This method prints the value of the value attribute on the instance.<\/p>\n\n\n\n<p>The output of the above example looks like the below:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">Creating new instance\nThe value of instance is:10<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">python __new__ inheritance<\/h2>\n\n\n\n<p>In python, when a subclass inherits from a parent class, it can override the <strong>new<\/strong> method of the parent class to change the way instances of the subclass are created.<\/p>\n\n\n\n<p>Below is an example of how <strong>new<\/strong> can be used in inheritance:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class TestParentClass:\n    def __new__(cls, *args, **kwargs):\n        print(\"Creating instance of TestParentClass\")\n        # Allocate memory for the new object\n        instance = super().__new__(cls)\n        # Return the new object\n        return instance\n\nclass TestChildClass(TestParentClass):\n    def __new__(cls, *args, **kwargs):\n        print(\"Creating instance of TestChildClass\")\n        # Allocate memory for the new object\n        instance = super().__new__(cls)\n        # Return the new object\n        return instance\n\n# Create a instance of testChildClass\nobj = TestChildClass()<\/pre>\n\n\n\n<p>when creating an instance of <code>TestChildClass<\/code>, the output will be:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">Creating instance of TestChildClass\nCreating instance of TestParentClass<\/pre>\n\n\n\n<p>The TestChildClass is a subclass of TestParentClass and has overridden the <strong>new<\/strong> method of the parent class. When creating a new instance of TestChildClass, the <strong>new<\/strong> method of TestChildClass is called first, followed by the <strong>new<\/strong> method of TestParentClass<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Python __new__ vs __init__<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"256\" src=\"https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/Python-__new__-vs-__init__-1024x256.webp\" alt=\"Python __new__ vs __init__\" class=\"wp-image-36811\" srcset=\"https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/Python-__new__-vs-__init__-1024x256.webp 1024w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/Python-__new__-vs-__init__-300x75.webp 300w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/Python-__new__-vs-__init__-768x192.webp 768w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/Python-__new__-vs-__init__-150x38.webp 150w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/Python-__new__-vs-__init__.webp 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>The <strong>new<\/strong> and <strong>init<\/strong> methods are two important functions in Python that are utilized during the process of creating a new object. They both play different purposes and are executed at different stages of object creation.<\/p>\n\n\n\n<p><strong>new<\/strong> is a static method that is executed first and its responsibility is to allocate memory for the new object. It returns a new instance of the class. By default, new calls the new method of the parent class to allocate memory for the new object. It can be customized by overwriting it.<\/p>\n\n\n\n<p><strong>init<\/strong>, on the other hand, is an instance method that is executed after a <strong>new<\/strong> has completed its task. Its purpose is to initialize the attributes of the newly created object. You can override <strong>init<\/strong> to define the default values for the attributes of your class and\/or to accept and process arguments passed to the class constructor.<\/p>\n\n\n\n<p>Below is the sample example that demonstrates the difference between <strong>new<\/strong> and <strong>init<\/strong>:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class TestClass:\n    def __new__(cls, *args, **kwargs):\n        print(\"Creating instance\")\n        # Allocate memory for the new object\n        instance = super().__new__(cls)\n        # Return the new object\n        return instance\n    \n    def __init__(self, *args, **kwargs):\n        print(\"Initializing instance\")\n\n# Create a new instance of TestClass\nobj = TestClass()<\/pre>\n\n\n\n<p>In this example, the <code>__new__<\/code> method is called first and is responsible for allocating memory for the new object. The <code>__init__<\/code> method is then called and is responsible for initializing the attributes of the newly created instance.<\/p>\n\n\n\n<p>It produces the below output<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"607\" height=\"306\" src=\"https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/01\/image-37.png\" alt=\"Python __new__ vs __init__\" class=\"wp-image-36725\" srcset=\"https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/01\/image-37.png 607w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/01\/image-37-300x151.png 300w, https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/01\/image-37-150x76.png 150w\" sizes=\"(max-width: 607px) 100vw, 607px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">More to explore<\/h2>\n\n\n\n<p><a href=\"https:\/\/naiveskill.com\/python-lowercase\/\">Python lowercase function<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/naiveskill.com\/python-xor\/\">Python xor function<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/naiveskill.com\/str-python\/\">Python str function<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/naiveskill.com\/__init__-python\/\">Python __init__ method<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/naiveskill.com\/python-__all__\/\" data-type=\"URL\" data-id=\"https:\/\/naiveskill.com\/python-__all__\/\">Python __all__ method<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this blog, we will learn everything about the python __new__ method. We will understand the python __new__ method with various examples. so let&#8217;s get started. What is python __new__ &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/naiveskill.com\/python-__new__\/\"> <span class=\"screen-reader-text\">python __new__ method with examples in 2023<\/span> Read More \u00bb<\/a><\/p>\n","protected":false},"author":1,"featured_media":36808,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"","footnotes":""},"categories":[70,34],"tags":[74,49],"uagb_featured_image_src":{"full":["https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__.webp",1200,628,false],"thumbnail":["https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__-150x150.webp",150,150,true],"medium":["https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__-300x157.webp",300,157,true],"medium_large":["https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__-768x402.webp",768,402,true],"large":["https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__-1024x536.webp",1024,536,true],"1536x1536":["https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__.webp",1200,628,false],"2048x2048":["https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__.webp",1200,628,false],"web-stories-poster-portrait":["https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__-640x628.webp",640,628,true],"web-stories-publisher-logo":["https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__-96x96.webp",96,96,true],"web-stories-thumbnail":["https:\/\/naiveskill.com\/wp-content\/uploads\/2023\/02\/python-__new__-150x79.webp",150,79,true]},"uagb_author_info":{"display_name":"naivetechblog@gmail.com","author_link":"https:\/\/naiveskill.com\/author\/naivetechbloggmail-com\/"},"uagb_comment_info":0,"uagb_excerpt":"In this blog, we will learn everything about the python __new__ method. We will understand the python __new__ method with various examples. so let&#8217;s get started. What is python __new__ &hellip; python __new__ method with examples in 2023 Read More \u00bb","_links":{"self":[{"href":"https:\/\/naiveskill.com\/wp-json\/wp\/v2\/posts\/36714"}],"collection":[{"href":"https:\/\/naiveskill.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/naiveskill.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/naiveskill.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/naiveskill.com\/wp-json\/wp\/v2\/comments?post=36714"}],"version-history":[{"count":15,"href":"https:\/\/naiveskill.com\/wp-json\/wp\/v2\/posts\/36714\/revisions"}],"predecessor-version":[{"id":36813,"href":"https:\/\/naiveskill.com\/wp-json\/wp\/v2\/posts\/36714\/revisions\/36813"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/naiveskill.com\/wp-json\/wp\/v2\/media\/36808"}],"wp:attachment":[{"href":"https:\/\/naiveskill.com\/wp-json\/wp\/v2\/media?parent=36714"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/naiveskill.com\/wp-json\/wp\/v2\/categories?post=36714"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/naiveskill.com\/wp-json\/wp\/v2\/tags?post=36714"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}