Docker Level-4 (resolve docker compose)

I tried to resolve that problem. When I finish my exercise I got “‘python’ container seems down or missing on app server 2”.
I was on stapp02 and yaml file was:

version: '2'
services:
  web:
    build: ./app
    container_name: python
    ports:
      - "5000:5000"
    volumes:
      - ./app:/code
    depends_on:
      - redis_app
  redis_app:
    image: redis
    container_name: redis