import random import time import pandas as pd import numpy as np import pickle import datetime starttime=datetime.datetime.now() population_size = 100 # Population size mutation_rate = 0.02 # mutation rate generations = 10000 # Evolutionary generations #Create initial population def create_initial_population(): population = [] cities = list(range(len(distance_matrix))) cities.remove(m) for _ in range(population_size): random.shuffle(cities) population.append(cities[:]) # Randomly […]
Tag: return
Spring Boot custom return objects and unified encapsulation
Friendly return to a unified standard format for easy recording Spring Boot also provides some methods to return objects uniformly without having to wrap each return class with its own return class. 1.Basic return class: package com.test.ft.common.wrapper; import cn.hutool.http.HttpStatus; import lombok.AllArgsConstructor; import lombok.Data; /** * @author aaa * @description basic return class */ @Data @AllArgsConstructor […]
The interface returns a response, unified encapsulation (ResponseBodyAdvice + Result) (SpringBoot)
Requirements The return response from the interface is encapsulated into a unified data format and then returned to the front end. Dependencies For the SpringBoot project, the interface layer is based on SpringWeb, which is SpringMVC. <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> Description In order to make the return result data of the interface more standardized and […]
Lazada gets lazada product details API return value description
item_get-get lazada product details lazada.item_get public parameters Name Type Required Description key String Yes Call key (must be spliced into the URL in GET mode) to obtain key and secret access secret String is calling key api_name String Yes API interface name (included in the request address) [item_search, item_get, item_search_shop, etc.] cache String No [yes,no]default […]
Mybatis @MapKey annotation returns the specified Map source code analysis and use cases
Article directory Preface Technology accumulation What is MyBatis @MapKey annotation Use case display MapKey annotation source code analysis write at the end Foreword A business function being developed recently needs to extract data based on business fields from a batch of data. For this requirement, some students may directly use for or stream loops to […]
! Android select file return path
I just finished the task I was given recently and picked up the OTA update that I hadn’t done for a long time.. (About selecting the file return path and copying it to cache/recovery!!) The following is a demo of selecting the file return path: 1.activity_main.xml <?xml version=”1.0″ encoding=”utf-8″?> <LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android” android:layout_width=”match_parent” android:layout_height=”match_parent” android:id=”@ + […]
The new version of jetpack navigation2.5.3 returns repeated creation of fragments
When navigation returns, it will re-create the version of the fragment before 2.3.5, most of the modifications (the new version is invalid): override fun navigate( destination: Destination, args: Bundle?, navOptions: NavOptions?, navigatorExtras: Navigator.Extras? ): NavDestination? { if (mFragmentManager.isStateSaved) { Log.i( TAG, “Ignoring navigate() call: FragmentManager has already” + “saved its state” ) return null } […]
[C language] In-depth functions whose return value is a function pointer
I wrote some fun code before C language function that returns a function pointer 1. Discovery #include<stdio.h> int (*drink(void)) (void) {<!– –> static int i; i + + ; printf(“(%d)\\ “, i); return (int(*)(void))drink; } int main() {<!– –> drink()(); return 0; } This code defines a function that returns a function pointer, and then […]
Work accumulation || The front-end is a list, the back-end is three lists, and the processing of input parameters and return parameters
Requirement 1: The list year should be displayed automatically on the front end indexNameItem(scope) { const numList = [‘one’, ‘two’, ‘three’, ‘four’, ‘five’, ‘six’, ‘seven’, ‘eight\ ‘, ‘ninety’]; const numListStr = numList[scope.$index]; let indexName = ”; if (numListStr === ‘a’) { indexName = ‘First year’; } else { indexName = `year ${numListStr}` } scope.row.indexNames = […]
[Microservice] Feign integrates Sentinel, and deeply explores Sentinel’s isolation and circuit breaker degradation rules, as well as authorization rules and custom exception return results.
Article directory Preface 1. Feign integrates Sentinel 1.1 Implementation steps 1.2 FallbackFactory example 2. Sentinel implements isolation 2.1 How to implement isolation 2.2 Sentinel implementation of thread isolation example 3. Circuit breaker downgrade rules 3.1 Principle and process of circuit breaker degradation 3.2 Circuit breaker strategy – slow call 3.3 Circuit breaker strategy – abnormal […]