text: """
    API and command-line interface
  """
  from . import get_extractor
  
  default_extractor = 'gaoqingfm'
  
  
  def search(keyword):
      Extractor = get_extractor(default_extractor)
      if not Extractor:
          raise TypeError('No proper extractor found by {}'.format(default_extractor))
      extractor = Extractor()
      extractor.fetch(keyword)
  