code: def init_datastore(config):
      
      if 'datastore' in config:
          # the datastore has already been initialized, just use it.
          return config['datastore']
      factory = config.pop('factory')
      if isinstance(factory, str):
          """
          factory should be a string defined in the pkg_resources.EntryPoint
          format.
          """
          factory = pkg_resources.EntryPoint.parse('x=' + factory).resolve()
      return factory(**config)
docs: Take the config definition and initialize the datastore.
  
      The config must contain either a 'datastore' parameter, which
      will be simply returned, or
      must contain a 'factory' which is a callable or entry
      point definition. The callable should take the remainder of
      the params in config as kwargs and return a DataStore instance.