code: def is_zip_file(models):
      r'''
      Ensure that a path is a zip file by:
       - checking length is 1
       - checking extension is '.zip'
      '''
      ext = os.path.splitext(models[0])[1]
      return (len(models) == 1) and (ext == '.zip'f is_zip_file(models):
      r'''
      Ensure that a path is a zip file by:
       - checking length is 1
       - checking extension is '.zip'
      '''
      ext = os.path.splitext(models[0])[1]
      return (len(models) == 1) and (ext == '.zip')
docs: r'''
      Ensure that a path is a zip file by:
       - checking length is 1
       - checking extension is '.zip'