小编dad*_*tta的帖子

使用docker-compose，我试图从中查看manage.py runserver与postgres图像连接的Flask应用程序，但出现以下错误：

sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) could not connect to server: Connection refused
    Is the server running on host "0.0.0.0" and accepting
    TCP/IP connections on port 5432? 

我的档案文件

version: '3.1'
services:
  app:
    build: .
    ports:
      - 5000:5000
    volumes:
      - /Users/sammy/Projects/my_flask_app:/my_flask_app
    container_name: my_flask_app_1
    depends_on:
      - db
    entrypoint: ["python", "manage.py", "runserver"]
  db:
    image: postgres:10
    restart: always
    container_name: my_app_db_1
    environment:
      POSTGRES_USER: ubuntu
      POSTGRES_PASSWORD: pickles
      POSTGRES_DB: db
    ports:
      - 5432:5432

从我的应用程序settings.py文件

POSTGRES = {
    'user': "ubuntu",
    'pw': "pickles",
    'db': "db",
    'host': os.getenv('IP', …

这是我的问题所遵循的代码......

jQuery的

$(document).ready(function(){
    $('.dude').hover(function(){
        $('div').find(">:first-child").css( "display", "inline" );
    }, function() {
    $('div').find(">:first-child").css( "display", "hidden" );
    );
});

CSS

.dude{
    min-height:50px;
}

HTML

<div class="dude">ONE<div>TWO</div>three</div>

当我将鼠标悬停在带有"dude"类的div框上时,我试图让TWO出现,只要用户正在徘徊,那么它就会回到隐藏状态.

为什么这不是一个无限的递归循环？

public static void main(String[] args) {
        System.out.println(isSuch(99) + " " + isSuch(100));
    }

    public static boolean isSuch(int n)
   {
      System.out.println("n is currently at "+ n);
       return n > 2 && !isSuch(n - 2);

    }