instruction: Write Docker code for compose
output: ```text
  import time
  
  import redis
  from flask import Flask
  
  app = Flask(__name__)
  cache = redis.Redis(host='redis', port=6379)
  
  def get_hit_count():
   retries = 5
   while True:
   try:
   return cache.incr('hits')
   except redis.exceptions.ConnectionError as exc:
   if retries == 0:
   raise exc
   retries -= 1
   time.sleep(0.5)
  
  @app.route('/')
  def hello():
   count = get_hit_count()
   return f'Hello World! I have been seen {count} times.\n'
  ```