Django 2.0 path error ?: (2_0.W001) has a route that contains '(? P <', starts with the character '^' or ends with the character '$'

Question

I am new to Django and trying to create internal code for a music application on my website.

I created the correct view in my views.py file (in the correct directory) as shown below:

 def detail(request, album_id): return HttpResponse("<h1>Details for Album ID:" + str(album_id) + "</h1>") 

however, when creating a URL or path for this (shown below)

 #/music/71/ (pk) path(r'^(?P<album_id>[0-9])/$', views.detail, name='detail'), 

A warning appears on my terminal that:

 ?: (2_0.W001) Your URL pattern '^(?P<album_id>[0-9])/$' [name='detail'] has a route that contains '(?P<', begins with a '^', or ends with a '$'. This was likely an oversight when migrating to django.urls.path(). 

and whenever /music/ (for which the path works) is followed by a number such as /music/1 (which I want to do), the page cannot be found, and the terminal displays the above warning.

It might be a simple mistake, and I'm just stupid, but I'm new to Django expressions and Python regular expressions, so any help is appreciated.

Answer 1

The new path() syntax in Django 2.0 does not use regular expressions. You want something like:

 path('<int:album_id>/', views.detail, name='detail'), 

If you want to use regex, you can use re_path() .

 re_path(r'^(?P<album_id>[0-9])/$', views.detail, name='detail'), 

The old url() still works and is now an alias of re_path , but most likely it will be deprecated in the future.

 url(r'^(?P<album_id>[0-9])/$', views.detail, name='detail'), 

Answer 2

Just to add to what @alasdair mentioned, I added re_path as part of the include, and it works great. Here is an example

Add re_path to your import (for django 2.0)

 from django.urls import path, re_path urlpatterns = [ path('admin/', admin.site.urls), re_path(r'^$', home, name='home'), ] 

Answer 3

Instead of using 're_path', you can also use '' (empty string) as the first argument to your path (). I used this and it worked for me.

 urlpatterns = [ path('admin/', admin.site.urls), path('',views.index,name='index'), ] 

Answer 4

Use the empty string '' instead of '/' or r '^ $'. It works great. Code as below:

 from django.urls import path, re_path urlpatterns = [ path('admin/', admin.site.urls), path('', home, name='home'), ] 

Answer 5

If this does not work, add this code to yoursite \ urls.py inside urlpatterns:

 path('music/<int:album_id>/', views.detail, name="detail"),