code: def readable_os_version():
      
      if platform.system() == 'Linux':
          return _linux_os_release()
      elif platform.system() == 'Darwin':
          return ' {version}'.format(version=platform.mac_ver()[0])
      elif platform.system() == 'Windows':
          return platform.platform()
docs: Give a proper name for OS version
  
      :return: Proper OS version
      :rtype: str