deps.py

import boto3

def get_s3_client():
    # Adapted from:
    #   https://gist.github.com/heitorlessa/5b709df96ea6ac5ddc600545c0683d3b?permalink_comment_id=4314586#gistcomment-431458
    return boto3.client(
        service_name="s3",
        endpoint_url="localhost:9000",
        aws_access_key_id="root",
        aws_secret_access_key="password",
        aws_session_token=None,
        verify=False,
    )

docker-compose.yml

version: "3"

services:
  minio:
    image: minio/minio
    ports:
      - 9000:9000
      - 9090:9090
    environment:
      MINIO_ROOT_USER: "root"
      MINIO_ROOT_PASSWORD: "password"
    command: minio server /data/minio --console-address ":9090"