问当前路径，与这些都不匹配- Django

EN

Using the URLconf defined in ddblog2.urls, Django tried these URL 
patterns, in this order:

admin/
^ [name='index']
^ category [name='category']
The current path, category.html/, didn't match any of these.

from django.conf.urls import url, include
from django.contrib import admin
from django.urls import path
from . import views

urlpatterns = [
    path('admin/', admin.site.urls),
    url(r'^', include('blog.urls')),
]

from django.urls import path
from . import views

urlpatterns = [
    path('', views.index, name='index'), 
    path('category/', views.category, name = 'category')
]

from django.shortcuts import render

def index(request):
    return render(request, 'index.html', {})

def category(request):
    return render(request, 'category.html', {})