def __str__(self): 를 추가하면 에러가 나요 ㅠㅠ

"", line 978, in _gcd_import File "", line 961, in _find_and_load File "", line 950, in _find_and_load_unlocked File "", line 655, in _load_unlocked File "", line 674, in exec_module File "", line 781, in get_code File "", line 741, in source_to_code File "", line 205, in _call_with_frames_removed File "C:\Users\Administrator\mysite\polls\models.py", line 25 def __str__(self): # __unicode__ on Python 2 ^ IndentationError: unexpected indent