следующий вопрос по django

вот мои файлы...

models.py

from django.db import models

class Topic(models.Model):
    '''Theme which learl user'''
    text = models.CharField(max_length=200)
    date_added = models.DateTimeField(auto_now_add=True)
    def __str__(self):
        return self.text

class Entry(models.Model):
    '''informarion learning user in theme'''
    topic = models.ForeignKey(Topic, on_delete=models.CASCADE)
    on_delete=models.CASCADE
    text = models.TextField()
    date_added = models.DateTimeField(auto_now_add=True)

    class Meta:
        verbose_name_plural = 'entries'

    def __str__(self):
        if len(self.text) > 50:
            return self.text[:50] + "..."
        else:
            return self.text

urls.py в learning_logs

from django.conf.urls import url
from . import views
urlpatterns = [
    #homepage
    url(r'^$', views.index, name='index'),
    ]

views.py from django.shortcuts import render

def index(request):
    '''Homepage learning log'''
    return render(request, 'learning_logs/index.html')

learning_logs\templates\learning_logs\index.html

<p>Learning Log</p>
<p>Learning Log Helps you keep track of your learning, for any topic you're learning about.</p>

главный urls.py

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



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

но когда я захожу по адресу http://127.0.0.1:8000 то есть на главную страницу, выдает ошибку 404, будьте добры, помогите разобраться в чем ошибка?