Python Django 2.0 路径错误 ?: (2_0.W001) 的路由包含 '(?P<', 以 '^' 开头，或以 '$' 结尾
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Django 2.0 path error ?: (2_0.W001) has a route that contains '(?P<', begins with a '^', or ends with a '$'
提问by Joe Tynan
I'm new to Django and am trying to create the back end code for a music application on my website.
我是 Django 的新手，正在尝试为我网站上的音乐应用程序创建后端代码。
I have created the correct view in my views.py file (in the correct directory) as shown below:
我在我的 views.py 文件（在正确的目录中）中创建了正确的视图，如下所示：
def detail(request, album_id):
return HttpResponse("<h1>Details for Album ID:" + str(album_id) + "</h1>")
however, when creating the url or path for this (shown below)
但是，在为此创建 url 或路径时（如下所示）
#/music/71/ (pk)
path(r'^(?P<album_id>[0-9])/$', views.detail, name='detail'),
I am experiencing a warning on my terminal stating:
我在终端上遇到警告，说明：
?: (2_0.W001) Your URL pattern '^(?P<album_id>[0-9])/$' [name='detail'] has a route that contains '(?P<', begins with a '^', or ends with a '$'. This was likely an oversight when migrating to django.urls.path().
and whenever the /music/(for which the path works) is followed by a number, such as /music/1(which is what I want to be able to do) the page cannot be found and the terminal gives the above warning.
并且每当/music/（路径适用的）后跟一个数字时，例如/music/1（这是我想要能够做的）无法找到页面并且终端会发出上述警告。
It may be a simple error and just me being stupid but I'm new to Django and python regex statements, so any help is appreciated.
这可能是一个简单的错误，只是我很愚蠢，但我是 Django 和 python regex 语句的新手，因此我们不胜感激。
回答by Alasdair
The new path()syntax in Django 2.0 does not use regular expressions. You want something like:
path()Django 2.0 中的新语法不使用正则表达式。你想要这样的东西：
path('<int:album_id>/', views.detail, name='detail'),
If you want to use a regular expression, you can use re_path().
如果要使用正则表达式，可以使用re_path().
re_path(r'^(?P<album_id>[0-9])/$', views.detail, name='detail'),
The old url()still works and is now an alias to re_path, but it is likely to be deprecated in future.
旧的url()仍然有效，现在是 的别名re_path，但将来可能会被弃用。
url(r'^(?P<album_id>[0-9])/$', views.detail, name='detail'),
回答by Stryker
Just to add to what @alasdair mentioned, I added re_path as part of the include and it works fine. Here is an example
只是为了添加@alasdair 提到的内容，我添加了 re_path 作为包含的一部分，它工作正常。这是一个例子
Add re_path to your import (for django 2.0)
将 re_path 添加到您的导入中（对于 django 2.0）
from django.urls import path, re_path
urlpatterns = [
path('admin/', admin.site.urls),
re_path(r'^$', home, name='home'),
]
回答by Akash Gupta
Instead of using 're_path' you can also use ''(empty string) as the first argument of your path(). I have used it and it worked for me.
除了使用 're_path'，您还可以使用 ''（空字符串）作为 path() 的第一个参数。我用过它，它对我有用。
urlpatterns = [
path('admin/', admin.site.urls),
path('',views.index,name='index'),
]
回答by DILIP
Use an empty string '' instead of '/' or r'^$'. It works like a charm. Code is as below:
使用空字符串 '' 而不是 '/' 或 r'^$'。它就像一个魅力。代码如下：
from django.urls import path, re_path
urlpatterns = [
path('admin/', admin.site.urls),
path('', home, name='home'),
]
回答by Hamza Naji
If it doesn't work add this code to yoursite\urls.py inside urlpatterns:
如果它不起作用，请将此代码添加到 urlpatterns 中的 yoursite\urls.py：
path('music/<int:album_id>/', views.detail, name="detail"),
回答by Parvez Khan Pathan
In django 2.0 version primary key write this way...
在 django 2.0 版本主键这样写...
urls.py
网址.py
from django.urls import path
from . import views
urlpatterns = [
path('', views.course_list),
path('<int:pk>/', views.course_detail),
]
回答by Purushotam Sangroula
url() is deprecated in newer version of django. So instead of using url use re_path() in your urls file as follows:
url() 在较新版本的 django 中已弃用。因此，在您的 urls 文件中使用 re_path() 而不是使用 url，如下所示：
from django.urls import path, re_path
from . import views
urlpatterns = [
#url(r'^(?P<album_id>[0-9]+)/$', views.detail, name='detail'),
path('', views.index, name='index'),
re_path(r'^(?P<album_id>[0-9])/$', views.detail, name='detail'),
]
