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#In Python multi inheritance, if a subclass inherits a method with the same name in multiple parent classes, which subclass will choose when calling class Item : def info (self): print("Item Method in","This is a commodity") class Product: def info(self): print("Product Method in" , "This is an industrial product") cl ...

XML configuration mode Attribute injection Construction injection: create a parametric construction method and a nonparametric construction method Injection in application.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XML ...

I. inherit the json module and derive new functions Inherit the JSONEncoder in the json module and derive new functions import json from datetime import date, datetime #Serializable data type takes precedence in the original json module # print(type(datetime.now())) #<class 'datetime.datetime'> #json cannot change the set, class # di ...

The main function of link script is to describe how the section of input file is mapped to the memory layout of output file. The popular way is to compile each obj file and place it in the bin address according to which order; at the same time, associate the run-time variable symbol with VMA. It mainly refers to the following Blogs:1. attribute ...

We've been asking vue about the principle of two-way data binding. Today, I'm just handwriting a two-way data binding and I'll get a better understanding of it. Because the current vue technology is also constantly updated, now updated to 3.0, the internal method logic has also changed a lot, so as the development of us, in fact, we master the ...

In a recent project, you need to use the mailbox activation function, but there is a problem! Problem Description: after sending the mailbox, the href attribute of the activation link of the mailbox is missing!!! Because I used the local address to do the test, and then replaced my href address with Baidu's link. Later Baidu, finally in an arti ...

Build mysql database and mysql common high-frequency commands I. environment construction II. Common commands 2.1 database operation 2.2 data table operation 2.3 view operation 2.4 data operation (add, delete, modify and query) I. environment construction This paper only builds learning in windows environment. Downlo ...

The basic steps of the crawler: get the url, parse the web page and find the required content; data processing; save. Knowledge points: (1) generally, the url of the same type of web page has certain rules, so you need to pay attention to observation when crawling, such as scenic spots Second pages: https://travel.qunar.com/p-cs ...

scrollLeft and scrollTop are used to get / set scroll bars, as follows: scrollLeft(val); read or set the horizontal scroll bar distance of the entire page scrollTop(val); read or set the vertical scroll bar distance of the entire page If no value of val is passed in, the scroll bar distance will be obtained. If val is set, the scroll bar dist ...

Vue.js virtual dom and diff algorithm What is virtual dom? Virtual DOM is also called vdom. In fact, it uses the Object model of js Object to simulate the real DOM, so its structure is a tree structure; vdom will render once as soon as it is created Take a look at the code //Initial virtual dom structure var vdom = { vn ...