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day23 02 combination (continue the dog fight game) Three characteristics of object-oriented: inheritance polymorphism encapsulation Let's talk about the combination Combination: the property value of one object is the object of another class: object, property and property (generally there are two points) Continue to expand the little game o ...

Query and statistical operation of tables I. data query 1. Requirements: find out the highest score information Statement Description: Linq uses group By group query the user's highest score information by user ID, group syntax: group tbAchievement by tbAchievement.UserID into tbStudent indicates that tbAchievement is ...

Pass value from parent component to child component <div id="app"> <! -- when a parent component references a child component, the data that needs to be passed to the child component can be passed to the internal of the child component in the form of attribute binding through the form of attribute binding (v-bind:), which is used ...

linux distribution system directory naming rules Use root file system structure and FHS hierarchy. linux system is strictly case sensitive, and the system directory inherits this feature. "/: root directory, the highest level directory of all directories / bin: the basic command storage directory available to all users / sbin: only the ...

1. Exceptions and Errors 1.1 Error There are inevitably errors in the program, and there are two types of errors 1.1.1 Syntax Error Syntax error: This kind of error can not pass the python interpreter's grammar detection at all and must be corrected before the program is executed. #Syntax Error Example 1 if #Grammar Error Example 2 def test: ...

axios interceptor + default parameter configuration + custom header settings + unified error handling This configuration file can fulfill simple project requirements, and the specific configuration depends on the project. It mainly includes: axios interceptor Default parameter configuration Custom header settings Un ...

Example of day23 03 combination I. use the combination method to write a circle and calculate its perimeter and area 1 from math import pi # Import from built-in functions pi 2 # Define a circle class first 3 class Circle: 4 def __init__(self,r): # Initialization and self The property of a circle is radius 5 self.r = ...

order This paper mainly studies the nodes sniffer of elastic search NodesSniffer elasticsearch-7.0.1/client/sniffer/src/main/java/org/elasticsearch/client/sniff/NodesSniffer.java /** * Responsible for sniffing the http hosts */ public interface NodesSniffer { /** * Returns the sniffed Elasticsearch nodes. */ List<Node> ...

0-1 knapsack backtracking algorithm [suitable for Xiaobai, with analysis + annotation] Title: using backtracking algorithm to realize 0-1 knapsack, the volume of knapsack is 7 Pack 4 items, the value of which is 9,10,7,4 respectively, and the weight of which is 3,5,2,1 respectively. Please use the backtracking method ...

ES6 can extract values from arrays and objects, and then assign values to variables. Classification of deconstruction assignment: array deconstruction assignment, object deconstruction assignment, string deconstruction assignment, numerical deconstruction assignment, Boolean value deconstruction assignment, function parameter deconstruction ass ...