What is the purpose of instance and owner in Python descriptors ...
网页2019年3月8日 · instance - this refers to the object of the class owner where you defined the descriptor object. The purpose of passing the instance to the __get__ method of the descriptor is to make sure we know and identify from which object of the owner class you are accessing the descriptor instance.
python描述器(Descriptor) - 知乎 - 知乎专栏
网页object.__get__(self, instance, owner) 调用时得到类的属性（类属性访问控制）或者类的实例的属性(实例属性访问控制)，owner是属性所在类，instance是属性所在类的实例或None(如果通过类进行访问的话)。该方法要么返回属性值，要么抛出AttributeError异常。
Python 描述符(Descriptor) 附实例 - 知乎 - 知乎专栏
网页定义. 一个描述符是一个有“绑定行为”的对象属性 (object attribute)，它的访问控制会被描述器协议方法重写。 任何定义了 __get__, __set__ 或者 __delete__ 任一方法的类称为描述符类，其实例对象便是一个描述符，这些方法称为描述符协议。 当对一个实例属性进行访问时，Python 会按 obj.__dict__ → type(obj).__dict__ → type(obj)的父类.__dict__ 顺序进行查找，如果查找到目标属性并发现是一个描述符，Python 会调用描述符协议来改变默认的控 …
Python 理解__get__和__set__以及Python描述符|极客教程
网页self是描述符实例自身，instance是访问属性的类实例，owner是属性的所有者类。 在上面的示例中，self是Descriptor实例，instance是MyClass实例，owner是MyClass类本身。 set 方法用于设置类属性的值。 当我们通过实例对属性进行赋值时，如果属性具有 set 方法，则会调用该方法来设置属性的值。 以下是一个示例： class Descriptor: def __set__(self, instance, value): print("Setting the attribute") . instance._value = value. class MyClass: . attribute = …
Descriptor Guide — Python 3.12.6 documentation
网页1 天前 · The owner is the class where the descriptor is used, and the name is the class variable the descriptor was assigned to. The implementation details are in type_new() and set_names() in Objects/typeobject.c .
【Python进阶】揭秘Python中的「描述符」及实战应用 - 知乎
网页2024年3月28日 · 描述符的__get__(), __set__()和__delete__()方法都接受三个参数：self（描述符实例本身）、instance（拥有描述符属性的类实例）和owner（拥有描述符属性的类）。其中instance为None表示访问的是类属性而非实例属性。
Instance owner - IBM DB2 9.7 for Linux, UNIX, and Windows
网页The instance owner user ID is used to start and stop the DB2® Text Search instance services on the DB2 server. Note that the DB2 instance and the DB2 Text Search services must be processes of the same user ID. In Version 9.7, the instance owner must hold DBADM with DATAACCESS authority.
DescribeInstances - Amazon Elastic Compute Cloud
网页Describes the specified instances or all instances. If you specify instance IDs, the output includes information for only the specified instances. If you specify filters, the output includes information for only those instances that meet the filter criteria.
How to get the DB2 server instance owner - DBA DB2
网页2015年1月31日 · Getting the DB2 server instance owner is a common requirement for auditing and inventory management. As a DBA, application owners request my team start managing a DB2 server. The first step is to document the DB2 server instance details, such as instance owner, port, data and log file paths,backup schedules,monitoring and a …
describe-instances — AWS CLI 1.34.28 Command Reference
网页Describes the specified instances or all instances. If you specify instance IDs, the output includes information for only the specified instances. If you specify filters, the output includes information for only those instances that meet the filter criteria.
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