code: def uuid_to_username(uuid):
      
      uuid_data = getattr(uuid, 'bytes', None) or UUID(uuid).bytes
      b32coded = base64.b32encode(uuid_data)
      return 'u-' + b32coded.decode('ascii').replace('=', '').lower()
docs: Convert UUID to username.
  
      >>> uuid_to_username('00fbac99-0bab-5e66-8e84-2e567ea4d1f6')
      'u-ad52zgilvnpgnduefzlh5jgr6y'
  
      >>> uuid_to_username(UUID('00fbac99-0bab-5e66-8e84-2e567ea4d1f6'))
      'u-ad52zgilvnpgnduefzlh5jgr6y'