url.py 을

from django.urls import path

from . import views

urlpatterns = [
    path('', views.index),
    path('<int:question_id>/', views.detail),
]

요렇게 고치고

views.py 를

from django.shortcuts import render

# Create your views here.
from django.http import HttpResponse
from .models import Question


# def index(request):
#     return HttpResponse("안녕하세요 pybo에 오신것을 환영합니다.")

def detail(request, question_id):
    """
    pybo 내용 출력
    """
    question = Question.objects.get(id=question_id)
    context = {'question': question}
    return render(request, 'pybo/question_detail.html', context)

이렇게 고치고

qustion_detail.html 을만들어

<h1>{{ question.subject }}</h1>

<div>
    {{ question.content }}
</div>

이렇게 하고

서버를 재시작 하니

(mysite) C:\projects\mysite>python manage.py runserver
Watching for file changes with StatReloader
Performing system checks...

Exception in thread django-main-thread:
Traceback (most recent call last):
  File "C:\python\lib\threading.py", line 973, in _bootstrap_inner
    self.run()
  File "C:\python\lib\threading.py", line 910, in run
    self._target(*self._args, **self._kwargs)
  File "C:\venvs\mysite\lib\site-packages\django\utils\autoreload.py", line 53, in wrapper
    fn(*args, **kwargs)
  File "C:\venvs\mysite\lib\site-packages\django\core\management\commands\runserver.py", line 118, in inner_run
    self.check(display_num_errors=True)
  File "C:\venvs\mysite\lib\site-packages\django\core\management\base.py", line 392, in check
    all_issues = checks.run_checks(
  File "C:\venvs\mysite\lib\site-packages\django\core\checks\registry.py", line 70, in run_checks
    new_errors = check(app_configs=app_configs, databases=databases)
  File "C:\venvs\mysite\lib\site-packages\django\core\checks\urls.py", line 13, in check_url_config
    return check_resolver(resolver)
  File "C:\venvs\mysite\lib\site-packages\django\core\checks\urls.py", line 23, in check_resolver
    return check_method()
  File "C:\venvs\mysite\lib\site-packages\django\urls\resolvers.py", line 408, in check
    for pattern in self.url_patterns:
  File "C:\venvs\mysite\lib\site-packages\django\utils\functional.py", line 48, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "C:\venvs\mysite\lib\site-packages\django\urls\resolvers.py", line 589, in url_patterns
    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
  File "C:\venvs\mysite\lib\site-packages\django\utils\functional.py", line 48, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "C:\venvs\mysite\lib\site-packages\django\urls\resolvers.py", line 582, in urlconf_module
    return import_module(self.urlconf_name)
  File "C:\python\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 850, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "C:\projects\mysite\config\urls.py", line 22, in <module>
    path('pybo/', include('pybo.urls')),
  File "C:\venvs\mysite\lib\site-packages\django\urls\conf.py", line 34, in include
    urlconf_module = import_module(urlconf_module)
  File "C:\python\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 850, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "C:\projects\mysite\pybo\urls.py", line 6, in <module>
    path('', views.index),
AttributeError: module 'pybo.views' has no attribute 'index'

이렇게 나오네요 ㅜㅜ

뭐가 잘못된것 일까요?