{"id":14529,"date":"2024-03-15T09:27:06","date_gmt":"2024-03-15T09:27:06","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-can-descriptors-be-implemented-in-the-python-virtual-machine\/"},"modified":"2025-08-06T09:56:37","modified_gmt":"2025-08-06T09:56:37","slug":"how-can-descriptors-be-implemented-in-the-python-virtual-machine","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-can-descriptors-be-implemented-in-the-python-virtual-machine\/","title":{"rendered":"Python VM Descriptors: Implementation Guide"},"content":{"rendered":"<p>In the Python virtual machine, a descriptor is a special object that can be used to define and control access to properties during the attribute access process in a class.<\/p>\n<p>To implement a descriptor, you need to define a class and implement some specific methods within that class that are part of the descriptor protocol. The following are the methods that need to be implemented in the descriptor protocol:<\/p>\n<ol>\n<li>This method is called when accessing an attribute through an instance. &#8216;self&#8217; refers to the descriptor object itself, &#8216;instance&#8217; refers to the instance object accessing the attribute, and &#8216;owner&#8217; refers to the class object owning the attribute. This method should return the value of the attribute.<\/li>\n<li>__set__(self, instance, value): This method is called when assigning a value to an attribute. &#8216;self&#8217; refers to the descriptor object itself, &#8216;instance&#8217; refers to the instance object accessing the attribute, and &#8216;value&#8217; is the new value to be set. This method should perform the assignment operation on the attribute.<\/li>\n<li>When an attribute is deleted, this method is called. &#8220;self&#8221; is the descriptor object itself, and &#8220;instance&#8221; is the instance object accessing the attribute. This method should delete the attribute.<\/li>\n<\/ol>\n<p>Here is a simple example of a descriptor:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">Descriptor<\/span>:\r\n    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">__get__<\/span>(<span class=\"hljs-params\">self, instance, owner<\/span>):\r\n        <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"Getting value\"<\/span>)\r\n        <span class=\"hljs-keyword\">return<\/span> instance._value\r\n\r\n    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">__set__<\/span>(<span class=\"hljs-params\">self, instance, value<\/span>):\r\n        <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"Setting value\"<\/span>)\r\n        instance._value = value\r\n\r\n    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">__delete__<\/span>(<span class=\"hljs-params\">self, instance<\/span>):\r\n        <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"Deleting value\"<\/span>)\r\n        <span class=\"hljs-keyword\">del<\/span> instance._value\r\n\r\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyClass<\/span>:\r\n    value = Descriptor()\r\n\r\nmy_obj = MyClass()\r\nmy_obj.value = <span class=\"hljs-number\">10<\/span>\r\n<span class=\"hljs-built_in\">print<\/span>(my_obj.value)\r\n<span class=\"hljs-keyword\">del<\/span> my_obj.value\r\n<\/code><\/pre>\n<p>In the example above, the Descriptor class implements the methods of the descriptor protocol. The value attribute in the MyClass class uses the Descriptor descriptor. When accessing, setting, or deleting the value attribute, the corresponding methods of the descriptor are called. The output is as follows:<\/p>\n<pre class=\"post-pre\"><code>Setting value\r\nGetting value\r\n10\r\nDeleting value\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>In the Python virtual machine, a descriptor is a special object that can be used to define and control access to properties during the attribute access process in a class. To implement a descriptor, you need to define a class and implement some specific methods within that class that are part of the descriptor protocol. [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[19610,19609,19607,212,19608],"class_list":["post-14529","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-attribute-access","tag-descriptor-protocol","tag-python-descriptors","tag-python-programming","tag-python-vm"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python VM Descriptors: Implementation Guide - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to implement descriptors in Python VM. 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