Both Dockerfile and docker-compose example files for a regular python Flask and postgresql environment

docker-composer.yaml

version: '3'
services:
  postgres:
    image: postgres:10
    restart: always
    environment:
      POSTGRES_USER: postgres
      POSTGRES_DB: postgres
      POSTGRES_PASSWORD: secret
    ports:
      - "5432:5432"
    volumes:
    - ./postgres-data/postgres:/var/lib/postgresql/data
  app:
    build: .
    volumes:
      - .:/code # for development only
    ports:
      - "5000:5000"
    depends_on:
      - postgres
    entrypoint: ["python", "app.py"]

Dockerfile

    
FROM python:3.7.3-stretch

RUN mkdir /code
WORKDIR /code
COPY requirements.txt /code/
RUN pip install -r requirements.txt
COPY . /code/
EXPOSE 5000