code: def from_env():
      
      if 'MICROMONGO_URI' in os.environ:
          return (os.environ['MICROMONGO_URI'],)
      host = os.environ.get('MICROMONGO_HOST', 'localhost')
      port = int(os.environ.get('MICROMONGO_PORT', 27017))
      return (host, port)
docs: Get host/port settings from the environment.