Docker status Exited (2)

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I am trying to use a docker but I got some troubles with that.

docker-compose :

    version: '3.7'
    
    services:
      web:
        container_name: web
        build:
          context: .
          dockerfile: Dockerfile
        command: python manage.py runserver 0.0.0.0:8000
        volumes:
          - ./web/:/usr/src/web/
        ports:
          - 8000:8000
          - 3000:3000
          - 5432:9432
        stdin_open: true
        depends_on:
          - db
    
      db:
        container_name: db
        image: postgres:12.0-alpine
        volumes:
          - postgres_data:/var/lib/postgresql/data/
        environment:
          - POSTGRES_USER=admin
          - POSTGRES_PASSWORD=pass
          - POSTGRES_DB=mydb
    
    volumes:
      postgres_data:

Dockerfile :

    # pull official base image
    FROM python:3.8.3-alpine
    
    # set work directory
    WORKDIR /usr/src/web
    
    # set environment variables
    ENV PYTHONDONTWRITEBYTECODE 1
    ENV PYTHONUNBUFFERED 1
    
    # install psycopg2 dependencies
    RUN apk update 
        && apk add postgresql-dev gcc python3-dev musl-dev
    
    # install nodejs
    RUN apk add --update nodejs nodejs-npm
    
    # copy project
    ADD . .
    
    # install dependencies
    RUN pip install --upgrade pip
    RUN pip install -r requirements.txt

I typed sudo docker-compose up -d --build and the container was successfully created but when I type that :

docker ps -a

I got that :

    ecf4382327f2        myservice_web             "python manage.py ru…"   34 seconds ago      Exited (2) 33 seconds ago                       web
    97e742aa2f32        postgres:12.0-alpine   "docker-entrypoint.s…"   35 seconds ago      Up 34 seconds               5432/tcp            db

I don’t understand why I got the status Exited (2)

Could you help me please ?

Thank you very much !

Source: Docker Questions