《python从入门到实践》第十九章没办法add new entry和edit entry

如下图，每当我想点save changes的时候，就会报错page not found. 找了很久也没发现错误在哪里，往下是代码，Django版本1.11，谢谢。

 urls.py

"""定义learning_log的URL模式"""
from django.conf.urls import url

from . import views

urlpatterns = [
    # 主页
    url(r'^$', views.index, name='index'),

    # 显示所有的主题
    url(r'^topics/$', views.topics, name='topics'),

    #显示特定主题的详细页面
    url(r'^topics/(?Pd+)/$', views.topic, name='topic'),

    # 用于添加新主题的网页
    url(r'^new_topic/$', views.new_topic, name='new_topic'),

    # 用于添加新条目的页面
    url(r'^new_entry/(?Pd+)/$', views.new_entry, name='new_entry'),

    # 用于编辑条目的界面
    url(r'^edit_entry/(?Pd+)/$', views.edit_entry, name='edit_entry'),
]

views.py

from django.shortcuts import render
from django.http import HttpResponseRedirect, Http404
from django.core.urlresolvers import reverse
from django.contrib.auth.decorators import login_required
from .models import Topic, Entry
from .forms import TopicForm, EntryForm
# Create your views here.
def index(request):
    """学习笔记的主页"""
    return render(request, 'learning_logs/index.html')

@login_required
def topics(request):
    """显示所有的主题"""
    topics = Topic.objects.filter(owner=request.user).order_by('date_added')
    context = {'topics':topics}
    return render(request, 'learning_logs/topics.html', context)

@login_required
def topic(request, topic_id):
    """显示单个主题及其所有的条目"""
    topic = Topic.objects.get(id=topic_id)
    if topic.owner != request.user:
        raise Http404
    entries = topic.entry_set.order_by('-date_added')
    context = {'topic': topic, 'entries': entries}
    return render(request, 'learning_logs/topic.html', context)

@login_required
def new_topic(request):
    """添加新主题"""
    if request.method != 'POST':
        #未提交数据，创建一个新表单
        form = TopicForm()
    else:
        # POST提交的数据，对数据进行处理
        form = TopicForm(request.POST)
        if form.is_valid():
            new_topic = form.save(commit=False)
            new_topic.owner = request.user
            new_topic.save()
            return HttpResponseRedirect(reverse('learning_logs:topics'))

    context = {'form': form}
    return render(request, 'learning_logs/new_topic.html', context)

@login_required
def new_entry(request, topic_id):
    """在特定的主题中添加新目录"""
    topic = Topic.objects.get(id=topic_id)

    if request.method != 'POST':
        form = EntryForm()

    else:
        form = EntryForm(data=request.POST)
        if form.is_valid():
            new_entry = form.save(commit=False)
            new_entry.topic = topic
            new_entry.save()
            return HttpResponseRedirect(reverse('learning_logs:topic',args=[topic_id]))

    context = {'topic': topic,'form': form}
    return render(request, 'learning_logs/new_entry.html', context)

@login_required
def edit_entry(request, entry_id):
    """编辑既有条目"""
    entry = Entry.objects.get(id=entry_id)
    topic = entry.topic
    if topic.owner != request.user:
        raise Http404

    if request.method != 'POST':
        form = EntryForm(instance=entry)
    else:
        form = EntryForm(instance=entry, data=request.POST)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect(reverse('learning_logs:topic', args=[topic.id]))

    context = {'entry': entry, 'topic': topic, 'form': form}
    return render(request, 'learning_logs/edit_entry.html', context)

edit_entry.html

{% extends "learning_logs/base.html" %}

{% block content %}
  
 

{{ topic }}

Edit entry: