code: def dnld_annotation(assc_file, prt=sys.stdout):
      
      if not os.path.isfile(assc_file):
          # assc_http = "http://geneontology.org/gene-associations/"
          assc_http = "http://current.geneontology.org/annotations/"
          _, assc_base = os.path.split(assc_file)
          src = os.path.join(assc_http, "{ASSC}.gz".format(ASSC=assc_base))
          dnld_file(src, assc_file, prt, loading_bar=None)
docs: Download gaf, gpad, or gpi from http://current.geneontology.org/annotations/