code: def get_feature(name):
      
      if name == 'css':
          return CSSFeatures()
      elif name == 'kohlschuetter':
          return KohlschuetterFeatures()
      elif name == 'readability':
          return ReadabilityFeatures()
      elif name == 'weninger':
          return WeningerFeatures()
      elif name == 'clustered_weninger':
          return ClusteredWeningerFeatures()
      else:
          raise ValueError('invalid feature name: "{}"'.format(name))
docs: Get an instance of a ``Features`` class by ``name`` (str).