The reason for the error is NameResolutionError(self.host,self,e)frome, which is an exception type in the urllib3 library. The reason for this error is that DNS resolution failed, that is, the host name or IP address attempted to be resolved cannot be found. This may be caused by the entered URL address being incorrect or the DNS server being temporarily unavailable. How to solve this error There may be several ways to solve this error: Check whether the entered URL address is correct and make sure it is accessible Make sure the DNS server is available, you can try using the "ping" command on the command line to test whether the DNS server is available Try accessing the website using the IP address instead of the hostname if behind a proxy

Concepts and instances of classes and methods Class (Class): used to describe a collection of objects with the same properties and methods. It defines the properties and methods common to every object in the collection. Objects are instances of classes. Method: Function defined in the class. Class construction method __init__(): The class has a special method (construction method) named init(), which is automatically called when the class is instantiated. Instance variables: In the declaration of a class, attributes are represented by variables. Such variables are called instance variables. An instance variable is a variable modified with self. Instantiation: Create an instance of a class, a specific object of the class. Inheritance: that is, a derived class (derivedclass) inherits the base class (baseclass)

Function means function. It is a reusable code block with specific functions. It is one of the basic components of a program. It can accept input parameters, perform specific operations, and return results. Its purpose is to encapsulate a reusable block of code. code to improve code reusability and maintainability.

Every year before Apple releases a new major version of iOS and macOS, users can download the beta version several months in advance and experience it first. Since the software is used by both the public and developers, Apple has launched developer and public versions, which are public beta versions of the developer beta version, for both. What is the difference between the developer version and the public version of iOS? Literally speaking, the developer version is a developer test version, and the public version is a public test version. The developer version and the public version target different audiences. The developer version is used by Apple for testing by developers. You need an Apple developer account to download and upgrade it.

Class is a keyword in Python, used to define a class. The method of defining a class: add a space after class and then add the class name; class name rules: capitalize the first letter. If there are multiple words, use camel case naming, such as [class Dog()].

jQuery is a classic JavaScript library that is widely used in web development. It simplifies operations such as handling events, manipulating DOM elements, and performing animations on web pages. When using jQuery, you often encounter situations where you need to replace the class name of an element. This article will introduce some practical methods and specific code examples. 1. Use the removeClass() and addClass() methods jQuery provides the removeClass() method for deletion

Vue error: Unable to use v-bind to bind class and style correctly, how to solve it? In Vue development, we often use the v-bind instruction to dynamically bind class and style, but sometimes we may encounter some problems, such as being unable to correctly use v-bind to bind class and style. In this article, I will explain the cause of this problem and provide you with a solution. First, let’s understand the v-bind directive. v-bind is used to bind V

How to solve the "[Vuewarn]:v-bind:class/:class" error During the development process of using Vue, we often encounter some error prompts. One of the common errors is "[Vuewarn]:v-bind:class" /:class" error. This error message usually appears when we use v-bind:class or :class attribute, indicating that Vue cannot correctly parse the class value we set. Then, if