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I'm following the Django documentation 01 but it can't work for me

I'm a beginner at Django.
views.py/my_app
from django.shortcuts import render
from django.http import HttpResponse
def index(request):
return HttpResponse("Hello World")
urls.py/my_app
from django.urls import path
from . import views
urlpatterns = [
path('', views.index, name='index'),
]
urls.py/my_project
from django.contrib import admin
from django.urls import include, path
urlpatterns = [
path('product/', include('product.urls')),
path('admin/', admin.site.urls),
]
Error:
Page not found (404)
Request Method: GET
Request URL: http://127.0.0.1:8000/product
Using the URLconf defined in Zero.urls, Django tried these URL patterns, in this order:
admin/
The current path, product, didn't match any of these.
You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.

page not found when making new url / view Django

Hello i am trying to add a basic url called localhost:8000/shop
so that when i am on my homepage, I can click a link called shop and It will lead me to localhost:8000/shop
in my urls.py i added
from django.conf import settings
from django.conf.urls.static import static
from django.contrib import admin
from django.urls import include, path
from homepage import views
urlpatterns = [
path('' , views.home),
path('admin/', admin.site.urls),
path('reviews/' , include('reviews.urls')),
path('shop/' , include('product.urls')),
]
in my folder called product i have a urls.py file with
from django.urls import include, path
from . import views
urlpatterns = [
path('shop/' , views.shop),
]
and in my product folder i have a views.py file with
from django.shortcuts import render
# Create your views here.
def shop(request):
return render(request, 'product/shop.html')
linking It to my html file inside my product folder..
when i run the server, I get this error message
Page not found (404)
Request Method: GET
Request URL: http://localhost:8000/shop
Using the URLconf defined in yorleico.urls, Django tried these URL patterns, in this order:
admin/
reviews/
shop/
The current path, shop, didn't match any of these.
What am i doing wrong?!

To register the path /shop, you need to use path('' , views.shop), in the urls.py in your shop app. The /shop prefix is already being defined by the path('shop/' , include('product.urls')), line in your project level urls.py.

All url patterns in the product app already start with shop/, due to the path('shop/', include('product.urls')). Therefore your urls.py for the products app should look like:
# product/urls.py
from django.urls import include, path
from . import views
urlpatterns = [
path('' , views.shop),
]
otherwise the path should be /shop/shop/.

Path cannot be found in django

I am working on a django project. The project includes 2 apps namely jobs and blog. The url.py of the main project file is:
from django.contrib import admin
from django.urls import path,include
from django.conf import settings
from django.conf.urls.static import static
import jobs.views
urlpatterns = [
path('admin/', admin.site.urls),
path('', jobs.views.home, name= 'home'),
path('blog/', include('blog.urls'))
] + static(settings.MEDIA_URL, document_root = settings.MEDIA_ROOT)
You can understand that I am calling the output of the jobs in the home. The url.py of the blog is:
from django.urls import path
from . import views
urlpatterns = [
path('', views.allblogs, name= 'allblogs'),
]
and the views.py of the blog is:
from django.shortcuts import render
def allblogs(request):
return render(request, 'blog/allblogs.html')
This gives an error that the blog/ can not be found. I must mention I make a allblogs.html in the address project/blog/templates/blog The webpage shows that it tries to find the page in this ditrectory: ...project\jobs\templates\blog\allblogs.html
The error message is:
TemplateDoesNotExist at /blog/
Request URL: http://localhost:8000/blog/
Exception Type: TemplateDoesNotExist
I dont know why it is trying to find it in jobs where it should search for it in blogs folder.
Can someone help? May be I have done something silly..

Django new URL not working

I'm trying to access a URL, http://localhost:8000/calc, but it gives me this error:
Using the URLconf defined in mysite.urls, Django tried these URL patterns, in this order:
^admin/
^$ [name='home']
^calc/
The current path, calc, didn't match any of these.
This is what I currently have for mysite URL and secondapp URL:
# mysite/urls.py
from django.conf.urls import url, include
from django.contrib import admin
from django.conf import settings
from django.conf.urls.static import static
urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'',include('firstapp.urls')),
url(r'^calc/',include('secondapp.urls')),
]
# secondapp/urls.py
from django.conf.urls import url
from secondapp.views import CalcPage
urlpatterns = [
url(r'calc/', CalcPage.as_view(), name='calc'),
]

As per the URL configuration you have stated in mysite.url and secondapp.url you link would be
localhost:8000/calc/calc/
which IMO would be confusing, if I am correct, URL you want is
localhost:8000/calc/
For that you have to change the url you have defined in secondapp.url to
from django.conf.urls import url
from secondapp.views import CalcPage
urlpatterns = [
url(r'$', CalcPage.as_view(), name='calc'),
]
This would make the ClacPage accessible on
localhost:8000/calc/
See / is very important when defining URLs.

use below reg-ex in urls.py
r'^calc/$'

Django url Routing Error

I have a very basic url router in my django project:
from django.conf.urls import patterns, include, url
from django.contrib.staticfiles.urls import staticfiles_urlpatterns
from django.contrib import admin
admin.autodiscover()
urlpatterns = staticfiles_urlpatterns()
urlpatterns += patterns('',
url(r'^admin/', include(admin.site.urls)),
url(r'^/?', include('customApp.urls')),
)
When I start the dev server and go to 127.0.0.1:8000/admin/, I get a ViewDoesNotExist at /admin/ error.
Here is the content of the exception:
Could not import customApp.views.event. View does not exist in module customApp.views.
I've already tried re-ordering the urls (I have no idea how that would help, but I tried it anyway) and changing r'^/?' to r'^/'.
When I comment out the last url, the admin page works again.
Here's the customApp.urls code:
from django.conf.urls import patterns, include, url
import django.contrib.auth.views
import django.contrib.auth
urlpatterns = patterns('customApp.views',
url(r'^$', 'index'),
url(r'^rest/v1/event/add/$', 'event'),
url(r'^rest/v1/reports/$', 'reports'),
)
urlpatterns += patterns('',
url(r'^login/$', 'django.contrib.auth.views.login', {'template_name': 'login.html'}),
)

It is simple buddy. Django cannot find customApp views. Please ensure whatever views you have got in urls.py, it should exist.
Thanks