text: class ServiceBag(object):
    """
    A top-level container for all of our services. A service bag should be passed
    around where needed to grant access to these services. This gives us
    dependency injection, and lets us reuse services when they have a startup
    cost (such as creating DB connections).
    """
    def __init__(self):
      self._create_services()
      self._warmup_services()
  
    def _create_services(self):
      pass
  
    def _warmup_services(self):
      pass
  