python django 2.2.4 Ошибка ImportConfigured в файле urls.py

Question

Вопрос

Когда я запустил веб-сервер Django с помощью 'python manager.py runserver', произошла какая-то ошибка.Похоже, что [django.core.exceptions.ImproperlyConfigured: включенный URLconf 'myproject.urls', похоже, не содержит никаких шаблонов.Если вы видите допустимые шаблоны в файле, то проблема, вероятно, вызвана циклическим импортом.]

Дерево проекта выглядит следующим образом:

root project
  myapp:
    __init__.py
    urls.py
    views.py
  myproject:
    __init__.py
    urls.py
    settings.py
    uwsgi.py
  manage.py
  __init__.py

myproject / urls.py code:

    from django.contrib import admin
    from django.urls import path, include  

    urlpatterns = [
        path('admin/', admin.site.urls),
        path('', include('myapp.urls', namespace='myapp')),
    ]

myapp / urls.py код:

from myapp import views
from django.urls import path

urlpatterns = [
    # path('/', views.Home.as_view(), name='home'),
    path('signup/', views.Signup.as_view(), name='signup'),
    path('signin/', views.Signin.as_view(), name='signin'),
    path('signout/', views.Signout.as_view(), name='signout'),
    path('make_csr/', views.MakeCSR.as_view(), name='make_csr'),
    path('upload_csr/', views.UploadCSR.as_view(), name='upload_csr'),
    path('publish_cer/', views.PublishCER.as_view(), name='publish_cer'),
]

Подробное сообщение об ошибке:

(cert_mgmt) C:\Users\wenca\Desktop\Python\virtual_environment\cert_mgmt\python\Src>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:\Program Files\Python37\lib\site-packages\django\urls\resolvers.py", line 581, in url_patterns
    iter(patterns)
TypeError: 'module' object is not iterable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Program Files\Python37\lib\threading.py", line 917, in _bootstrap_inner
    self.run()
  File "C:\Program Files\Python37\lib\threading.py", line 865, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Program Files\Python37\lib\site-packages\django\utils\autoreload.py", line 54, in wrapper
    fn(*args, **kwargs)
  File "C:\Program Files\Python37\lib\site-packages\django\core\management\commands\runserver.py", line 117, in inner_run
    self.check(display_num_errors=True)
  File "C:\Program Files\Python37\lib\site-packages\django\core\management\base.py", line 390, in check
    include_deployment_checks=include_deployment_checks,
  File "C:\Program Files\Python37\lib\site-packages\django\core\management\base.py", line 377, in _run_checks
    return checks.run_checks(**kwargs)
  File "C:\Program Files\Python37\lib\site-packages\django\core\checks\registry.py", line 72, in run_checks
    new_errors = check(app_configs=app_configs)
  File "C:\Program Files\Python37\lib\site-packages\django\core\checks\urls.py", line 40, in check_url_namespaces_unique
    all_namespaces = _load_all_namespaces(resolver)
  File "C:\Program Files\Python37\lib\site-packages\django\core\checks\urls.py", line 57, in _load_all_namespaces
    url_patterns = getattr(resolver, 'url_patterns', [])
  File "C:\Program Files\Python37\lib\site-packages\django\utils\functional.py", line 80, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "C:\Program Files\Python37\lib\site-packages\django\urls\resolvers.py", line 579, in url_patterns
    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
  File "C:\Program Files\Python37\lib\site-packages\django\utils\functional.py", line 80, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "C:\Program Files\Python37\lib\site-packages\django\urls\resolvers.py", line 572, in urlconf_module
    return import_module(self.urlconf_name)
  File "C:\Program Files\Python37\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "C:\Users\wenca\Desktop\Python\virtual_environment\cert_mgmt\python\Src\myproject\urls.py", line 7, in <module>
    path('', include('myapp.urls', namespace='myapp')),
  File "C:\Program Files\Python37\lib\site-packages\django\urls\conf.py", line 34, in include
    urlconf_module = import_module(urlconf_module)
  File "C:\Program Files\Python37\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "C:\Users\wenca\Desktop\Python\virtual_environment\cert_mgmt\python\Src\myapp\urls.py", line 1, in <module>
    from myapp import views
  File "C:\Users\wenca\Desktop\Python\virtual_environment\cert_mgmt\python\Src\myapp\views.py", line 21, in <module>
    class Signup(View):
  File "C:\Users\wenca\Desktop\Python\virtual_environment\cert_mgmt\python\Src\myapp\views.py", line 26, in Signup
    'post_link': reverse('myapp:signup'),
  File "C:\Program Files\Python37\lib\site-packages\django\urls\base.py", line 58, in reverse
    app_list = resolver.app_dict[ns]
  File "C:\Program Files\Python37\lib\site-packages\django\urls\resolvers.py", line 512, in app_dict
    self._populate()
  File "C:\Program Files\Python37\lib\site-packages\django\urls\resolvers.py", line 446, in _populate
    for url_pattern in reversed(self.url_patterns):
  File "C:\Program Files\Python37\lib\site-packages\django\utils\functional.py", line 80, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "C:\Program Files\Python37\lib\site-packages\django\urls\resolvers.py", line 588, in url_patterns
    raise ImproperlyConfigured(msg.format(name=self.urlconf_name))

django.core.exceptions.ImproperlyConfigured: The included URLconf 'myproject.urls' does not appear to have any patterns in it. If you see valid patterns in the file then the issue is probably caused by a circular import.