python class destructor

Python's object base class __del__ method This method of Python is a destructor that executes when an instance is destroyed, destroys the memory associated with the instance, methods, attributes, and so on. Also, if the base class specifies a particular property or other method, the subclass also needs to be explici

address of a[0] and the address of a[2] differ by 48 (2 24). When the a[1] is modified again, the address of a[1] also changes, interestingly, this a[1] address and a[0] address is 24, and the original a[2] Difference 72 (3 24). Finally, when the address of the number 0 is printed directly, it is found to be exactly the same as the address of the first a[0]. At this point, it is basically possible to say that even the elements in the list are actually references. Modifying the elements in the l

Here we will explain in detail the Descriptor class in Python in the future, including defining the Descriptor and displaying how to call the Descriptor. if you need a friend, refer to the Descriptor as a class to reconcile attribute access. The descriptor class can be used to obtain, set, or delete attribute values. D

Design of the classThe design of the Python oop is discussed here, that is, how to use classes to model useful objects. The commonly used OOP design patterns in Python, such as inheritance, composition, delegation, and factory, will be written. It also introduces some concepts of class design, such as pseudo-private property, multi-inheritance, etc.==============

This article mainly describes the Python meta-class instance resolution, the main task of this article is to give you a thorough understanding of what is a meta-class, the need for friends can refer to the next Uncle Turtle invented Python and then integrated a bunch of concepts into the language, such as: iterators,

statement actually simply lets A[0] point back to another object. In addition, it is noted that the address of a[0] differs from that of a[2] by 48 (2 24). When the a[1] is modified again, the address of the a[1] is also changed, interestingly, the address of this a[1] and a[0] differ by 24, and the original A[2 is 72 (3 24). Finally, when the address of the number 0 is printed directly, the address is found to be exactly the same as the address of the first a[0]. At this point, the basic ca

The examples in this article describe the specialized methods for Python classes. Share to everyone for your reference. The specific analysis is as follows: Python classes can define specialized methods that are called by Python for you in special cases or when using special syntax, rather than directly in code (as in normal methods). 1. __init__ Similar to cons

The definition format of the class:Class CLASSNAME (parent Class 1, parent Class 2, parent Class 3):__a = 0 # #私有属性, two _ starts, only functions in that class can accessB = 0 # #公共属性def function name (self):Self.__a = ... #访问私有属性名Self. B = ... #访问公共有属性名Ps:1, when defining the function, must have self this parameter, a

(Get_machine ()))Print('Computer's network name: [{}]'. Format (Get_node ()))Print('Computer processor information: [{}]'. Format (Get_processor ()))Print('get operating system type: [{}]'. Format (Get_system ()))Print('summary information: [{}]'. Format (Get_uname ()))defshow_os_info ():" "Print only OS information, no explanation section" " Print(Get_platform ())Print(Get_version ())Print(Get_architecture ())Print(Get_machine ())Print(Get_node ())Print(Get_processor ())Print(Get_system ())

Body The first thing to be explained is that Python classes are divided into classic classes and new classes.The classic class is python2.2, but it's still compatible in 2.7, but the version after 3 only admits the new class.New classes can be used in later versions of python2.2 The difference between a classic class and a new

As an inheritance of the ABC language, the Python programming language helps developers solve some difficult problems. In addition, it is easy to use and greatly improves the development efficiency. We will introduce the usage of the Python Thread class in detail today. Analysis of basic Python naming conventions

About the class, reader must have had the feeling, look at the following code, please read carefully, and see if you can find something wrong? Copy Code code as follows: #!/usr/bin/env python #coding: Utf-8 Class Person:def __init__ (self, name, Lang, email):Self.name = NameSelf.lang = LangSelf.email = Email def author (self):Return Self.name

This time for you to bring Python's meta-class how to use, the use of Python meta-class considerations are what, the following is the actual case, take a look. Today my task is to thoroughly understand what is a meta-class and look together. To understand the meta-class, le

The examples in this article describe the class methods that are bound and unbound in Python. Share to everyone for your reference, as follows: Like a function, a class method in Python is also an object. Because methods can be accessed either through an instance or through a clas